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WH 12DM WR 12DM - Tool Parts Direct

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1. 12DM WR 12DM POWER TOOLS CORDLESS IMPACT DRIVER WH 12DM TECHNICAL DATA CORDLESS IMPACT WRENCH AND SERVICE MANUAL A TL1 r J EBI ZavDI 120 120 LIST Nos WH 12DM 862 2001 12DM 864 SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT REMARK Throughout this TECHNICAL DATA AND SERVICE MANUAL a symbol s is are used in the place of company name s and model name s of our competitor s The symbol s utilized here is are as follows WH 12DM Competitor Symbol Utilized Company Name Model Name 6916D WR 12DM Competitor Symbol Utilized Company Name Model Name 6918D CONTENTS 1 PRODUCGT Qua ma S 1 2 MARKETING OBJECTIVE annan don iii 1 3 APPLICATIONS 1 4 STANDARD EQUIPMENT uuu 1 MIJEBIcH el gulce 2 5 1 Selling Point Descriptions nn 4 6 SPECIFICATIONS x iu c 14 6 1 Specifications Em 14 6 2 Optional ACCESSOMES i x itera pa aa 15 7 COMPARISONS WITH SIMILAR 24 422 18 7 1 Specification Comparisons Cordless Imp
2. 20 0 0 1 2 3 Tightening time sec Steel plate thickness t 3 8 10 mm 9 16 x 1 15 16 Nm M44 x 50 160 140 120 High strength bolt 100 80 60 Ordinary bolt 40 20 0 0 1 2 3 Tightening time sec Steel plate thickness t 1 25 mm 7 4 Tightening Time Thanks to the new 30 higher power rare earth magnet motor the 35 larger hammer and the computer analysis the Model WH 12DM gives optimum impact at tightening screws and the tightening speed is 30 higher than the previous mod The data below are int hardness of the workp el Tightening time comparison is shown below ended for reference purposes only because actual tightening time will vary depending on ambient temperature characteristics of the battery 1 Wood screw 5 3 mm dia x 120 mm length hemlock spruce Model Fast 4 Slow 1 2 3 5 6 7 9 10 sec HITACHI WH 12DH C HITACHI WH 12DM Po 65sec LL 95sec ssrsRYri 7 2 sec 2 Wood screw 5 3 mm dia x 120 mm length lauan Model Fast 8 Slow 2 4 6 10 12 14 16 18 20 sec HITACHI WH 12DM HITACHI WH 12DH 9 5 sec 19 sec EN 11 9 sec 3 Wood screw 4 5 dia x 90 mm length hemlock spruce Fast Slow Model 1 2 3 4 5 sec HITACHI WH 12DM 1 24 sec WH 12DH 4 1 sec C BEEN 3 2 sec 4 Wood screw
3. 807 Bit holder 4 Ergonomically designed comfortable handle e When the previous model is continuously operated the housing tail rubs the base of the operator s thumb and gives pain to the operator To cope with this problem the Models WH 12DM WR 12DM are equipped with the separate type motor without case to make the housing tail section slim e More delicate speed control is required at the start of tightening screws The Models WH 12DM WR 12DM have a grip whose circumference at the switch section is shorter than for ease of operation grip circumference at the switch section with respect to C 14 mm e The grip of the Models WH 12DM WR 12DM is soft slip resistant and comfortable thanks to the soft resin elastomer covered on the handle The new double layer molding process M DSI Multi layered Die Slide Injection is introduced to mold the nylon resin and the elastomer resin continuously in the same die Since the elastomer resin is molded while the formerly molded nylon resin is still hot they are adhered by fusion and the adhesion is so firm as to be torn if you try to remove the soft material layer from the nylon resin layer 7 Enhanced maintainability WH 12DM Short grip circumference at the switch section Previous model Soft and slip resistant grip za Slim tail section 724 M DSI Abbreviation of Multi layered Die Slide Injection This is a molding process that allows t
4. 34 1 11 32 34 1 11 32 e Bit adaptor Code No 991476 639 mina 45 mm 1 25 32 12 7 mm 1 2 n Part name RE i Code No gn UA 45 1 25 32 955229 ES No 2 70 2 3 4 955654 i ad ki 45 1 25 32 955230 No 3 70 2 3 4 955655 e Extension bar Overall length 100 mm 3 15 16 Code No 873633 Dihedral width of Universal joint Code No 992610 applicable bolts eode io Socket ass y for duct 12 15 32 993658 13 1 2 992613 14 9 16 992615 EW 14R corner attachment Code No 9329 9001 Imm 7 COMPARISONS WITH SIMILAR PRODUCTS 7 1 Specification Comparisons Cordless Impact Driver HITACHI WH 12DM WH 12DH 5 4 8 4 8 4 8 Small screw 5 32 5 16 5 32 5 16 5 32 5 16 o Capacity Ordinary bolt E CR 5 3 16 15 32 3 16 15 32 3 16 15 32 High strength bolt aie ae aie a nu ESE torque TRU in lbs 1000 Tien 868 ft lbs 1020 eae in lbs 5 No load rotation speed 0 2 300 0 2 200 0 2 300 S Impact rate min 0 3 000 0 3 000 0 3 000 Main body weight kq 1 6 3 5 Ibs 1 7 3 7 lbs 1 5 3 3 Ibs Max tightening torque Nem 4440 W e in lbs 1070 kita Si in lbs 1110 use in lbs No load rotation speed
5. 4 Mounting the hammer assembly to the housing Raise the housing assembled in step 2 and mount the hammer assembly to the housing being careful of proper engagement between the Idle Gear Set 18 15 of the hammer assembly check that Washer E 21 18 is mounted on the Spindle 17 lt 14 gt and the Ring Gear 20 17 After mounting check that the hammer assembly turns If the hammer assembly does not turn the gears engage 5 Mounting the hammer case Put Anvil C 9 Anvil L Ass y 6 on the Spindle 17 14 Cover it with the Hammer Case 7 3 and secure with the four Tapping Screws W SP Washer D4 x 25 Black 6 2 6 Mounting Guide Sleeve A 4 WH 12DM only Insert the two Steel Balls D3 5 8 into the hole of Anvil C 9 Mount the Guide Sleeve A 4 Guide Spring 3 and Washer D 2 in sequence Push down Mount the Retaining Ring 1 into the groove of anvil using the J295 jigs A and B for retaining ring as illustrated in Fig 17 Retaining Ring 1 x J295 jig B for retaining ring Washer D 2 J295 jig A for retaining ring Fig 17 7 Reassembly of the hook Check that the V Lock Nut M5 40 lt 37 gt is mounted into the Hook Ass y 39 36 Mount the Hook Spring 42 lt 39 gt and secure it with the Special Screw M5 43 lt 40 gt Make sure to mount the Hook Spring 42 lt 39 gt with its larger diameter side
6. 5 Removal of the Hook Ass y 39 36 Remove the Special Screw M5 43 40 with a flat blade screwdriver or a coin and remove the Hook Ass y 39 lt 36 gt and the Hook Spring 42 39 6 Removal of Housing B Remove the seven Tapping Screws W Flange 04 x 20 Black 31 28 from the main body Before removing Housing B be sure to remove the Brush Caps 30 27 because Housing B cannot be removed if the Brush Caps 30 27 are mounted 7 Remove the FET of the DC Speed Control Switch 36 33 from the Dust Guard Fin 27 24 Then the Inner Cover 24 21 Armature ass y 25 22 Magnet 26 23 Brush Block 28 25 and DC Speed Control Switch 36 33 be removed in a piece Pushing Button 37 34 and the Strap 41 38 can also be removed 8 Removal of the switch assembly Remove the two Machine Screws W SP Washer M3 x 5 35 32 that secure the flag terminal and then disconnect the internal wires purple and black of the Brush Block 28 25 from the DC Speed Control Switch 36 33 Note Do not disconnect the three FET internal wires soldered to the DC Speed Control Switch 9 Removal of the Magnet 26 23 and the Dust Guard Fin 27 24 Remove the Magnet 26 23 in the B direction see Fig 8 holding the Inner Cover 24 21 securely because the Magnet 26 23 has a strong magnetism The Dust Guard Fin 27 24 can be easi
7. To reduce the risk of injury user must read and understand Instruction Manual AVERTISSEMENT Afin de r duire le risque de blessures l utilisateur doit lire et bien comprendre le mode d emploi For Oceania CAUTION Read thoroughly HANDLING INSTRUCTIONS before use 2 The following cautions are listed on the Name Plate attached to each type EB 1220BL or EB 1230HL storage battery For Europe ke e Read thoroughly HANDLING INSTRUCTIONS i before use Do not disassemble nor throw into fire For the U S A CAUTION For safe operation see Instruction Manual Use HITACHI charger UC 12Y 14Y 24Y series for recharging 3 The following caution is listed on the Name Plate attached to the Model UC 14YF2 Charger For the U S A CAUTION For safe operation see Instruction Manual e Charge HITACHI rechargeable batteries Type EB 7 EB 9 EB 12 and EB 14 series Other types of batteries may burst causing personal injury and damage Charge between 32 and 104 F Indoor use only e Replace defective cord immediately J 8 2 Tightening Torque Inspection Prior to Operation As described and shown in 7 3 3 the output tightening torque of which the Models WH 12DM and WR 12DM capable in excess of the rated tightening torque of certain bolts and screws Accordingly if the tightening time is prolonged for such bolts and screws it could cause damage t
8. Fig 13 for proper wiring b When connecting the internal wires of the Brush Block 28 25 to the DC Speed Control Switch 36 33 fasten them with the Machine Screw W SP Washer M3 x 5 35 32 paying attention to the direction of the flag terminal Fig 13 Note If the flag terminal is mounted in wrong direction the flag terminal may be damaged due to contact with the housing In addition the gap between the housings A Brush Block 28 25 and B is widened and dust may get into the housings A and B Internal wire black Flag terminal Machine Screw W SP Washer M3 x 5 35 32 Internal wire purple DC Speed Control Switch 36 lt 33 gt Fig 13 34 c Mount a unit of the Inner Cover 24 21 including the Armature Ass y 25 lt 22 gt Magnet 26 23 including the Dust Guard Fin 27 lt 24 gt and Brush Block 28 25 into housing A See Fig 15 Pay attention to the following items e Adjust the protrusion of the Dust Guard Fin 27 24 to the notch of the Magnet 26 23 when mounting the Dust Guard Fin 27 24 to the Magnet 26 23 See Fig 14 Insert the two Dampers 23 18 so that they fit into the Inner Cover 24 21 Fit the locking rib of the Ring Gear 20 17 to the concave portion of the Damper 23 20 Press fit the Armature Ass y 25 22 into the Inner Cover 24 21 Adjust t
9. M5 M12 3 16 15 32 High strength bolt M12 1 4 15 32 Tightening torque 100 N m 1020 kgf cm 885 in Ibs 150 N m 1530 kgf cm 1330 in Ibs Tip condition 6 35 mm 1 4 Bit holder 12 7 mm 1 2 Square drive Type of motor Fan cooled rare earth magnet motor Enclosure Main body Polyamide resin elastomer Housing Aluminum alloy die casting Hammer case Storage battery ABS resin black Charger ABS resin black Type of switch Trigger switch with forward reverse changeover pushing button with brake Handle configuration T type No load rotational speed 0 2 300 min Impact rate 0 3 000 min Main bod 1 6 kg 3 5 Ibs Incl 54 Weight y 6 kg 3 5 Ibs Includes battery Battery 0 68 kg 1 5 Ibs Overall length x height 167 mm 6 37 64 x 226 mm 8 9 173 mm 6 13 16 x 226 mm 8 9 Center height 26 mm 1 1 64 Battery Type EB 1220BL Sealed cylindrical nickel cadmium batteries Nominal voltage DC 12V Nominal life Charging discharging approximately 1 000 cycles in case of Model UC 14YF2 Nominal capacity 2 0 Ah Battery Type EB 1230HL Sealed cylindrical nickel metal hydride batteries Nominal voltage DC 12V Nominal life Charging discharging approximately 500 cycles in case of Model UC 14YF2 Nominal capacity 3 0 Ah Charger UC 14YF2 Charger power source si
10. SPECIAL SCREW M5 BATTERY EB 1220BL W ENGLISH 320 386 BATTERY EB 1220BL W ENGLISH FOR USA CAN 320 388 BATTERY EB 1230HL W ENGLISH N P 1 1 1 1 1 2 2 1 1 1 2 1 1 1 1 1 2 2 7 1 1 1 2 1 1 1 1 1 1 1 1 2 1 1 ALTERNATIVE PARTS 10 01 STANDARD ACCESSORIES WR 120 DESCRIPTION REMARKS CHARGER MODEL UC 14YF2 320 377 OPTIONAL ACCESSORIES CODE NO DESCRIPTION REMARKS 310 378 BATTERY EB 12B W ENGLISH 310 452 BATTERY EB 12B W ENGLISH 310 453 BATTERY EB 12B W ENGLISH CORNER ATTACHMENT ASS Y 955 300 HOUSING 955 301 METAL 955 302 SPINDLE HITACHI LABEL 955 303 BEARING RACE 955 304 NEEDLE THRUST BEARING NTA 1413 955 305 COVER 955 306 NEEDLE BEARING NTN BK1012 948 227 RETAINING RING FOR D47 HOLE 955 307 PINION 955 308 SLEEVE 955 309 WASHER 955 310 SOCKET COVER 955 311 SOCKET 303 247 SEAL LOCK HEX SOCKET HD BOLT 5 25 873 537 SOCKET PIN 873 187 O RING J1SW1516 991 481 FORM TIE SOCKET ASS Y 11 3MMX95L 992 610 UNIVERSAL JOINT ASS Y 955 153 UNIVERSAL JOINT PIN 991 476 BIT ADAPTER ASS Y 944 291 HEX SOCKET ASS Y 10MMX40L 873 632 HEX SOCKET ASS Y 12MMX40L 873 539 HEX SOCKET ASS Y 13MMX40L 873 540 HEX SOCKET ASS Y 14MMX40L 873 536 HEX SOCKET ASS Y 17MMX3
11. e Tapping Screw W Flange D4 x 20 Black 31 28 lt 1 96 0 49 N m 20 5 17 4 4 3 in Ibs e Machine Screw W SP Washer x 5 35 32 iii 0 29 0 39 3 4 kgf cm 2 6 3 5 in lbs e Special Screw M5 43 lt 40 gt tres 1 96 0 49 N m 20 5 kgf cm 17 4 4 3 in Ibs Brush cap 30 lt 27 gt TEPEE EEIE TVP EEA EAE A EEEE 0 78 0 10 N m 8 1 kgf cm 6 9 0 9 in lbs 10 2 Precautions in Disassembly and Reassembly of Battery Charger Refer to the Technical Data and Service Manual for precautions in disassembly and reassembly of the Model 14 2 Battery Charger 38 11 STANDARD REPAIR TIME UNIT SCHEDULES Variable MODEL A 10 20 30 40 50 60 min Fixed Work Flow WH 12DM WR 12DM DC Speed Control Switch Housing A B Set Inner Cover Armature Ass y Magnet Brush Block General Assembly p gt Hammer Case Steel Ball Washer Hammer Anvil B Washer Ring Gear Hammer Spring Spindle Idle Gear Set Needle Roller Ball Bearing 6901VV 39 HITACHI LIST NO F862 ELECTRIC TOOL PARTS LIST CORDLESS IMPACT DRIVER 2001 10 5 Model WH 12DM E1 PARTS CODE NO 315 984 DESCRIPTION RETAINING RING REMARKS WH12DM 315 983 WASHER D 315 982 GUIDE SPRING 319 921 GUIDE SLEEVE A 32
12. factory by making sample machines 2 High durability Owing to the shift of demand from nails to screws and increased demand for long screws impact drivers having high heat resistance in continuous operation are much sought after However there are problems such as heavy noise or vibration of the ball bearings and decrease in power if the impact drivers are used harshly in dusty environments In addition higher strength and longer service life are required to continuously tighten and loosen bolts in scaffolding and demolishing works The Models WH 12DM WR 12DM have high durability dust resistance and long service life in continuous operation as described below 1 Enhanced heat resistance of the motor Example When tightening M12 bolts continuously Cycle of operation 5 second impacting and 10 second stopping 3 0 Ah battery used The heat resistance comparison between the Models WH 12DM WR 12DM and C is shown below The Models WH 12DM WR 12DM are equipped with a powerful motor having 9 larger core diameter 13 larger stacking length 1 4 times thicker winding 2 times larger cross section of the conductor and 33 larger volume of the armature than C The cooling efficiency is improved and the temperature rise is reduced to half of C when using two batteries thanks to the powerful full fledged large radial fan and the computer analyzed air ducts Thus the Models WH 12DM WR 12DM are protected from burnout due to long time continuous use a
13. min 0 2 390 0 2 180 0 2 750 5 Impact rate min 0 2 800 0 2 900 0 2 660 5 Overall length x height mm E 22 32 n Center height mm 26 1 1 64 26 1 1 64 26 1 1 64 Main body weight kq 1 66 3 7 Ibs 1 73 3 8 Ibs 1 58 3 5 Ibs No load sound pressure level dB A 69 69 71 Tool tip mounting system Driver chuck Driver chuck Driver chuck Variable speed switch with Variable speed switch with Variable speed switch with Type of switch forward reverse forward reverse forward reverse changeover lever changeover lever changeover lever Type of motor DC magnet DC magnet DC magnet Voltage 12 12 12 Current A 28 17 26 Type 1220BL or EB 1230HL EB 12B or EB 12H 1222 Battery Nominal capacity Ah 1230HL 30 EB 12H 3 0 20 Nominal voltage V 12 12 12 Ambient temperature C 0 40 0 40 Model UC 14YF2 UC 14YF or UC 14YF2 DC1411 Charger Power input capacity VA 44 44 Recharging voltage V 7 2 14 4 7 2 14 4 7 2 14 4 iandard acuassolies Plastic tool case Plastic tool case Plastic tool case e Charger UC 14YF2 Charger Charger UC 14YF or UC 14YF2 1 In the case of tapping screws and wood screws a minimum of 1 8 is possible 2 Max tightening torque is based on tightening an M12 5 32 bolt strength grade 12 9 for 3 seconds with a hexagon socket 3 Main body weight does not include accessory tools hexagon bit et
14. pointing inward the housing 8 Checking the direction of rotation Check whether the direction of rotation of Anvil C 9 or Anvil L Ass y lt 6 gt coincides with the directional markings on the push on side of the Pushing Button 37 34 When the Pushing Button 37 34 is turned to R side the direction of rotation of Anvil C 9 or Anvil L Ass y lt 6 gt should be clockwise as viewed from behind 372 9 Lubrication a ATTOLUB MS No 2 e Cam groove and sliding section of the Spindle 17 14 e Cam groove and oil groove of the Hammer 11 8 e 8 diameter hole of Anvil 9 or Anvil L Ass y 6 sliding section between Anvil 9 or Anvil L Ass y 6 and the metal and upper surface of the claw e Two Steel Balls D5 556 10 lt 7 gt ePinion tooth flanks of the Armature Ass y 25 22 tooth flanks of the Ring Gear 20 17 tooth flanks of the Idle Gear Set 2 pcs 18 lt 15 gt e Metal oil groove of the Hammer Case 7 3 eTwenty eight Steel Balls D3 175 12 lt 9 gt b HITACHI MOTOR GREASE No 29 WH 12DM only Two Steel Balls D3 5 8 e Sliding section between Anvil C 9 and Guide Sleeve A 4 c MOLUB ALLOY 777 1 e All around the Needle Roller 19 16 e5 mm diameter hole of Idle Gear Set 2 pcs 18 lt 15 gt 10 Screw tightening torque e Tapping Screw W SP Washer D4 x 25 Black 6 2 1 96 0 49 20 5 kgf cm 17 4 4 3 in Ibs
15. tip mounting system Plunger Plunger Variable speed switch with Variable speed switch with Variable speed switch with Type of switch forward reverse forward reverse forward reverse changeover lever changeover lever changeover lever Type of motor DC magnet DC magnet DC magnet Voltage 12 12 12 Current A 28 17 22 Type 1220BL EB 1230HL 12B or 12 1222 EB 1220BL 2 0 EB 12B 2 0 N 2 0 Baton 1230HL 3 0 EB 12H 3 0 Nominal voltage 12 12 12 Ambient temperature 5 40 5 40 Model UC 14YF2 UC 14YF or UC 14YF2 DC1411 Charger Power input capacity VA 44 44 Recharging voltage V 7 2 14 4 7 2 14 4 7 2 14 4 Plastic tool case Plastic tool case Plastic tool case Standard accessories e Charger UC 14YF2 Charger Charger 1 Max tightening torque is based on tightening an M16 5 8 bolt F10T for 3 sec with a hexagon socket 2 tightening torque is based on tightening an M14 9 16 bolt strength grade 12 9 for sec with a hexagon socket 3 Main body weight does not include accessory tools hexagon bit etc 2 19 2 7 3 Tightening Torque 7 3 1 Tightening torque characteristic comparisons Thanks to the high power rare earth magnet motor and the larger hammer inertia the Models WH 12DM WR 12DM can provide greater tightening torque 1 Impact driver Tightening torque 2 Impact wrench Tightening torque kgf cm
16. 0 418 319 917 FRONT CAP TAPPING SCREW W SP WASHER D4X25 BLACK 319 923 HAMMER CASE 319 535 STEEL BALL D3 5 10 PCS 320 417 ANVIL C OIN 959 154 319 916 STEEL BALL D5 556 10 PCS HAMMER ANA pala a l ee 959 148 STEEL BALL D3 175 10 PCS N 315 978 WASHER J 319 915 HAMMER SPRING 316 172 316 171 WASHER 5 STOPPER 319 912 SPINDLE 319 913 IDLE GEAR SET 2 PCS 319 914 NEEDLE ROLLER 319 910 319 911 RING GEAR WASHER E 690 1VV BALL BEARING 6901VVCMPS2L 319 909 DAMPER 319 908 INNER COVER 360 557 319 919 ARMATURE ASS Y W BALL BEARING DC 12V MAGNET 319 907 DUST GUARD FIN 319 905 BRUSH BLOCK 999 054 CARBON BRUSH 5X6X11 5 1 PAIR 319 918 302 086 BRUSH CAP TAPPING SCREW W FLANGE D4X20 BLACK NAME PLATE 320 381 HOUSING A B SET 316 186 SUPPORT B 994 532 319 906 MACHINE SCREW W SP WASHER M3X5 DC SPEED CONTROL SWITCH 316 166 PUSHING BUTTON HITACHI LABEL 320 287 HOOK ASS Y INCLUD 40 320 288 306 952 V LOCK NUT M5 STRAP BLACK 319 926 HOOK SPRING 319 927 SPECIAL SCREW M5 320 387 BATTERY EB 1220BL W ENGLISH N P 320 386 320 388 BATTERY EB 1220BL W ENGLISH N P BATTERY 1230HL W ENGLISH FOR USA CAN CA
17. 1200 1042 in lbs 1000 868 in lbs 800 694 in lbs 600 521 in lbs 400 347 in lbs 200 174 in lbs 0 WH 12DM Test conditions Bolt M12 x 45 mm 15 32 x 1 25 32 _ strength grade 12 9 Steel plate Mild steel Thickness 25 mm 1 Mit ton Accessory tool Hexagon socket al Z gt 80 60 forward 40 WH 12DH 20 0 0 1 2 3 sec 0 Tightening time Nm 1600 1389 in lbs 1400 1215 in lbs 1200 1042 in lbs 1000 868 in Ibs 800 694 in lbs 600 521 in lbs 400 347 in lbs 200 174 in lbs 0 Fig 4 1 WR 12DM 160 W Test conditions 140 Bolt M16 x 55 mm 5 8 x 2 5 32 F10T 1 Steel plate Mild steel 120 aoe Thickness 25 mm 1 z lt Accessory tool Hexagon socket ass y 100 gt 80 WR 12DH 60 C 40 20 0 0 1 2 3 sec Tightening time Fig 4 2 20 7 3 2 Screw diameter and appropriate tightening torque Generally speaking the appropriate tightening torque for a screw can be determined by the strength grade of the screw and the material tightened Tables 1 and 2 and Fig 5 below list data relative to the strength grade of various screws and the appropriate tightening torque For further reference appropriate tightening torque is calculated with the following formula Study and use this formula for accurate selection of
18. 2L FOR NZL AUS FOR USA CAN INCLUD 603 619 INCLUD 618 619 INCLUD 618 619 INCLUD 618 619 INCLUD 618 619 INCLUD 618 619 INCLUD 618 619 INCLUD 618 619 INCLUD 618 619 629 873 624 HEX SOCKET ASS Y 19MMX34L INCLUD 618 619 m k KEY EY lt AE YE YE YE Y KES IN KES AE SEY KE ANNA G lt 10 01 ALTERNATIVE PARTS 3 OPTIONAL ACCESSORIES CODE NO 873 626 DESCRIPTION SOCKET ASS Y 21MMX36L REMARKS INCLUD 618 619 WR 12DM 873 627 SOCKET ASS Y 22MMX40L INCLUD 618 619 955 138 SOCKET ASS Y LONG 12MMX52L INCLUD 618 619 955 139 SOCKET ASS Y LONG 13MMX52L INCLUD 618 619 955 140 955 141 SOCKET ASS Y LONG 14MMX52L SOCKET ASS Y LONG 17MMX52L INCLUD 618 619 INCLUD 618 619 955 149 SOCKET ASS Y LONG 17MMX75L INCLUD 618 619 955 142 SOCKET ASS Y LONG 19MMX52L INCLUD 618 619 955 150 SOCKET ASS Y LONG 19MMX75L INCLUD 618 619 955 143 955 151 SOCKET ASS Y LONG 21MMX52L HEX SOCKET ASS Y LONG 21MMX75L INCLUD 618 619 INCLUD 618 619 991 480 HEX SOCKET ASS Y LONG 21MMX125L INCLUD 618 619 955 144 HEX SOCKET ASS Y LONG 22MMX52L INCLUD 618 619 986 058 HEX SOCKET FOR PLASTIC CONE 12MMX70L INCLUD 618 619 873 633 993 658 EXTENSION BAR ASS Y
19. 32 9 16 5 8 Fig 5 o4 7 3 3 Bolt Tightening torque characteristics Figures 6 1 and 6 2 show relationships between time and tightening torque for individual bolt types and sizes While the data are useful for handy reference actual tightening torque will vary depending on tightening conditions and other variables For details please refer to Para 8 3 Tightening Torque Variation Note eThe term tightening time indicates the impact time after the lower surface of the bolt has come in contact with the material into which it is being tightened e In the tightening conditions shown in Figs 6 1 and 6 2 the screws are being tightened directly into a steel plate accordingly the torque goes up very abruptly in comparison with ordinary bolt tightening conditions Bolt Steel plate thickness t Nut e Model WH 12DM kghom nm 9 18 x 1 3 6 in lbs M8 x 30 1000 100 868 gt 800 80 o 694 High strength bolt 600 60 2 521 pi o F 400 40 347 200 20 174 2 3 Tightening time sec Steel plate thickness t 3 8 10 mm e Model WR 12DM kgf cm 3 8 x 1 5 32 10 30 1000 100 868 800 L 80 694 High strength bolt 2 600 go 2 521 E 8 400 Ordinary bolt 5 347 40 200 174 p 20 0 0 0 1 2 8 Tightening time sec Steel plate thickness t 3 8 10 m
20. 4 5 mm dia x 90 mm length lauan Fast Slow Model 1 2 3 4 5 sec HITACHI WH 12DM HITACHI WH 12DH C 1 37sec J _ e ww 4 3 sec 23 7 5 Number of Screws or Bolts Driven 7 5 1 Per charge working capacity comparisons Test data on the number of screws or bolts which can be driven per battery charge by the new models vs the previous models are shown in the tables below Please note that the data below are intended for general reference only as the number of screws which can be tightened per charge will vary slightly depending on screw tightening conditions screw sizes ambient temperatures and the charging capacity of the battery 1 Number of screws or bolts driven Cordless impact driver Model HITACHI HITACHI Tightening condition WH 12DM WH 12DH 1222 salon EB pope zi Corresponding EB 1220BL Wood screw 4 0 mm dia x 50 mm 575 545 635 soft wood Wood screw 4 2 mm dia x 90 mm hard wood 115 110 105 Wood screw 5 3 mm dia x 120 mm hard wood 89 40 an Machine screw M8 x 16 mm 1 280 1 215 1 475 Note 1 The Model WH 12DM is equipped with the larger hammer and the higher power motor for the higher tightening speed Although the higher tightening speed is realized the Model WH 12DM has the following disadvantage e High startup current The Model WH 12DM consumes higher power than C for driving a short or machine screw because it re
21. C TOOL PARTS LIST CORDLESS IMPACT WRENCH 2001 10 25 Model WR 12DM E1 PARTS CODE NO 320 383 DESCRIPTION FRONT CAP REMARKS WR 12DM 319 917 TAPPING SCREW W SP WASHER D4X25 BLACK 320 382 HAMMER CASE 985 209 PIN RETAINER 985 208 320 384 PLUNGER ANVIL L ASS Y INCLUD 4 5 959 154 STEEL BALL D5 556 10 PCS 319 916 HAMMER 959 148 STEEL BALL D3 175 10 PCS N SIMIN 315 978 319 915 WASHER J HAMMER SPRING 316 172 WASHER 5 316 171 STOPPER 319 912 SPINDLE 319 913 319 914 IDLE GEAR SET 2 PCS NEEDLE ROLLER 319 910 RING GEAR 319 911 WASHER E 690 1VV BALL BEARING 6901VVCMPS2L 319 909 319 908 DAMPER INNER COVER 360 557 ARMATURE ASS Y W BALL BEARING DC 12V 319 919 MAGNET 319 907 DUST GUARD FIN 320 376 999 054 BRUSH BLOCK CARBON BRUSH 5X6X11 5 1 PAIR 319 918 BRUSH CAP 302 086 TAPPING SCREW W FLANGE D4X20 BLACK NAME PLATE 320 381 HOUSING A B SET CAUTION PLATE FOR USA 994 532 MACHINE SCREW W SP WASHER M3X5 319 906 DC SPEED CONTROL SWITCH 316 166 PUSHING BUTTON 320 378 HITACHI LABEL HOOK ASS Y INCLUD 37 320 288 V LOCK NUT M5 306 952 STRAP BLACK 319 926 HOOK SPRING 319 927 320 387
22. SQUARE 12 7MMX100L SOCKET ASS Y FOR DUCT 12MMX95L INCLUD 618 619 INCLUD 618 619 646 993 659 SOCKET FOR DUCT 12MMX52L 992 613 SOCKET ASS Y FOR DUCT 13MMX95L INCLUD 618 619 648 992 614 SOCKET FOR DUCT 13MMX52L 992 615 992 616 SOCKET ASS Y FOR DUCT 14MMX95L SOCKET FOR DUCT 14MMX52L INCLUD 618 619 650 309 922 GREASE FOR IMPACT DRIVER 500G h h h ee ALTERNATIVE PARTS Printed in Japan 011025N Hitachi Koki Co Ltd
23. Spring Spindle 17 lt 14 gt Push down 14 lt 11 gt In this position remove the Stopper 16 lt 13 gt with a flat blade Hammer Spring 14 lt 11 gt Stopper 16 lt 13 gt Washer S 15 lt 12 gt screwdriver then release the hand press See Fig 9 J 297 base for washer S Fig 9 Remove the hammer assembly from the J 297 base for washer S and support the end surface of the Spindle 17 lt 14 gt With a hand press push down either of the raised faces of Hammer 11 lt 8 gt to compress the Hammer Spring 14 lt 11 gt In this position extract the two Steel Balls D5 556 10 lt 7 gt from the cam grooves of the Spindle 17 lt 14 gt and Hammer 11 lt 8 gt with a small flat blade screwdriver or a similar tool Then slowly release the hand press and lift Hammer 11 lt 8 gt and Washer S 15 lt 12 gt together to extract them from the Spindle 17 lt 14 gt The Hammer Spring 14 lt 11 gt can then be removed Raised faces of hammer Spindle 17 lt 14 gt Top of spindle cam Steel Ball D5 556 10 lt 7 gt Hammer 11 lt 8 gt Steel ball guide groove Fig 10 4 Removal of the Carbon Brushes 5 x 6 x 11 5 29 lt 26 gt Remove the two Brush Caps 30 lt 27 gt Catch the flanges of the Carbon Brushes 5 x 6 x 11 5 29 lt 26 gt with a small flat blade screwdriver or a similar tool and remove the Carbon Brushes 29 lt 26 gt at both sides 32
24. UTION PLATE a lt s kl AA lt NY af lt lt st ls ada FOR USA ALTERNATIVE PARTS 10 01 STANDARD ACCESSORIES WH12DM CODE NO DESCRIPTION REMARKS CHARGER MODEL UC 14YF2 320 377 CODE NO DESCRIPTION REMARKS 310 378 BATTERY EB 12B W ENGLISH 310 453 BATTERY EB 12B W ENGLISH FOR USA CAN 316 665 BATTERY EB 12H W ENGLISH 992 671 DRIVER B NO 2 501 992 672 DRIVER NO 3 501 996 177 NON MAGNETIC HEX SOCKET 8MM 65L 985 329 NON MAGNETIC HEX SOCKET 10MM 65L 996 178 NON MAGNETIC HEX SOCKET 12MM 65L 996 179 NON MAGNETIC HEX SOCKET 13MM 65L 996 180 HEX SOCKET 14MM 65L 996 181 NON MAGNETIC HEX SOCKET 16MM 65L 996 182 NON MAGNETIC HEX SOCKET 17MM 65L 996 197 HEX SOCKET LONG 21MMX166L 996 195 DRILL CHUCK AND ADAPTER SET INCLUD 613 614 930 119 CHUCK WRENCH 6 5G 307 543 ADAPTER 309 922 GREASE FOR IMPACT DRIVER 500G 10 01 ALTERNATIVE PARTS 3 CODE NO DESCRIPTION REMARKS WH12DM Printed in Japan 10 01 011005N LISTNO F864 ELECTRI
25. acity 3 0 Ah UC 14YF2 charger and case 4 2HLFK specification Two EB 1230HL batteries NiMH capacity 3 0 Ah UC 14YF2 charger and case eee 5 SELLING POINTS 1 Cordless Impact Driver WH 12DM Ultra compact body but class top tightening speed 30 faster than the previous model 10 faster than Maximum torque 100 N m the same torque in forward reverse rotation Enhanced maintainability Singly replaceable armature Replaceable carbon brushes Low operating noise Powerful tightening thanks to the large hammer Noise level of the Model WH 12DM compared with the previous model When tightening wood screws 3 dB When tightening bolts 4 dB Stepless variable speed switch Startup speed is decreased to 20 rpm to prevent screws from falling sideways New compact and cyber design Overall length of the Model WH 12DM compared with the previous model Overall length 9 mm Girth of housing 10 mm Height 19 mm Weight 80 g Handle angle is changed from 5 to 10 easy to handle Compact and stable flat battery Selectable from three types high capacity NiMH battery light weight NiMH battery and NiCad battery Conventional stand up batteries EB 12B etc are also usable Convenient one touch hook e Quick slide out hook angle adjustable Mountable on either side Bit holder High durability High durab
26. act Driver 18 7 2 Specification Comparisons Cordless Impact 19 723 Tightening P 20 1 4 lightening Speed ii 23 7 5 Number of Screws or Bolts Driven i 24 7 6 Actual Noise When Tightening Wood Screws and Bolts 25 8 PRECAUTIONS IN SALES PROMOTION u u 26 8 1 Safety Instructions ka re ec eo Mae 26 8 2 Tightening Torque Inspection Prior to Operation I a 28 8 3 Tightening Torque Variation LLL ui 28 8 4 Suggestions and Precautions for the Efficient Use of the Charger 29 9 OTHER PRECAUTIONS 5 ul U nana ran tetas anna kok ARMAR ARRARRRRRDARRIRRRR ERR MEAE Sra AAS 30 10 REPAIR GUIDE 22 Ms 31 10 1 Precautions in Disassembly and 31 10 2 Precautions Disassembly and Reassembly of Battery Charger 38 11 STANDARD REPAIR TIME UNIT SCHEDULES 39 Assembly Diagram for WH 12DM Assembly Diagram for WR 12DM 1 PRODUCT NAME Hitachi Cordless Impact Driver Model WH 12DM Hitachi Cordless Impact W
27. act seal bearings 3 Improved service life durability Although the service life may vary depending on the frequency of use and the severity the service life of the Models WH 12DM WR 12DM is 1 5 times longer than C in spite of the compact body because the Models WH 12DM WR 12DM have strong components such as the highly durable motor and the gears made of specially heat treated steel to realize powerful operation 3 Convenient one touch hook hook is very convenient if there is no place to put the impact driver temporarily Although various kinds of hooks are on the market there is a user demand for a standard accessory hook To cope with this demand the Models WH 12DM WR 12DM are equipped with the hook having the following features as a standard accessory 1 The hook can be quickly slid out and can be slid in when not needed The hook is mountable on either side to cope with the use by either right handed persons and left handed persons The mounting position can be changed by using a flat blade screwdriver or a coin 9 The angle of the hook is adjustable in five steps 0 20 40 60 and 80 The hook can be adjusted to the optimum position according to the weight of the bit in use 4 The bit holder that can contain a 65 mm double ended bit is provided It is very convenient for holding a spare bit Quick slide out type W Angle adjustable in five steps 0 20 40 60
28. after use If the Models 1220BL and 1230HL Storage Batteries are exposed to direct sunshine for extended period or if the temperature of the batteries is 40 104 F or higher immediately after they have been used in the tool the pilot lamp may not light up when the batteries are connected to the Model UC 14YF2 Charger This is because the built in thermostat functions to stop the charging when the temperature of the storage batteries reach 40 C 104 F or more In such a case the customer should be advised to place the batteries in shaded area with a good airflow and allow sufficient cooling before recharging This phenomenon is common to all existing batteries which employ temperature sensitive overcharge devices The cooling time required before charging can be accomplished varies from a few minutes to about 30 minutes depending on the load duration of use and ambient temperature 9 OTHER PRECAUTIONS 1 Check for cracks or other damage on the socket Cracks or any other faults on the socket are very hazardous In addition cracks or other damage to accessories will cause loss of tightening torque efficiency Advise the customer to inspect accessories often and ensure there are no abnormalities 2 Socket dimensions Without fail utilize an appropriate socket which matches the bolt and or nut dimensions If the socket dimensions are larger than the bolts or nuts it will not only cause insufficient t
29. c 18 7 2 Specification Comparisons Cordless Impact Wrench UC 14YF or UC 14YF2 HITACHI Item WR 12DM WR 12DH Ordinary bolt 6 16 6 14 8 14 dla aaa 1 4 5 8 1 4 9 16 5 16 9 16 apaci E mo CO 6 12 6 10 6 12 8 Y SUS 1 4 15 32 1 4 3 8 1 4 15 32 5 f 150 117 62 120 Max tightening torque N M 1590 1330 in lbs 1200 1040 in lbs 1224 kgf cm 1060 in lbs 8 No load rotation speed min 0 2 300 0 2 200 0 2 300 S Impact rate min 0 3 000 0 3 000 0 3 000 O Main body weight kg 1 6 3 5 Ibs 1 7 3 7 lbs 1 6 3 5 Ibs 160 122 114 Max tightening torque NM 1630 1415 in lbs 1245 kgfcm 1080 in lbs 1160 kgf cm 1005 in lbs No load rotation speed 0 2 390 0 2 180 0 2 750 3 Impact rate min 0 2 800 0 2 900 0 3 070 173 x 226 180 x 245 176 x 231 5 Overall length x height MM 6 13716 x 8 9 7 1 8 x 9 21 32 6 15 16 x 9 3 32 8 Center height mm 26 1 1 64 26 1 1 64 26 1 1 64 Main body weight 1 67 3 7 Ibs 1 73 3 8 Ibs 1 60 3 5 Ibs No load sound pressure level dB A 69 69 71 Tip condition 12 7 mm 1 2 Square drive 12 7 mm 1 2 Square drive 12 7 mm 1 2 Square drive Tool
30. diameter of applicable bolts Dihedral o Socket primary dimensions mm drive Part ode so width 8 dimension name No High Di Inch H Sq strength Ordinary Smalltype screw L Li Di 10 mm 944291 M 6 1 4 10 3 8 40 1 9 16 8 66 16 18 23 32 12 mm 873632 M 8 5 16 W 5 16 12 15 32 B 40 1 9 16 8 5 16 20 25 32 13 873539 M8 5 16 13 1 2 40 1 9 16 9 11 32 25 1 14 mm 873540 M 10 3 8 14 916 B 40 1 9 16 9 11 32 25 1 12 7mm o 1 2 5 17 mm 873536 M 10 3 8 M12 15 22 W 3 8 17 21 32 C 32 1 4 8 5 28 1 3 327 x 19 mm 873624 M 12 15 32 M 14 9 16 W 7 16 19 23 32 34 1 11 32 9 11 32 28 1 3 32 21 mm 873626 W 1 2 21 53 64 D 36 1 13 32 10 3 8 32 1 1 4 22 mm 873627 M 12 15 32 M 14 9 16 M16 5 8 22 7 8 0 40 1 9 16 14 9 16 35 1 3 8 24 mm 873629 M 16 5 8 M 18 23 32 24 15 16 D 40 1 9 16 15 916 38 1 1 2 e Each dimension and applicable bolt for each long socket Shape B Shape D Di dia 246 SEZ si Sq ESILIO ron Pa
31. e Model 12DM compared with the previous model WR 12DH 8 mm ZZZ 49 2 008 5 1 Selling Point Descriptions Common selling points Models WH 12DM and WR 12DM 1 New compact and cyber design The Models WH 12DM WR 12DM have vibrant and cyber looks thanks to the widely adopted soft urethane resin elastomer and the complicated 3 D curved surfaces stirring up curiosity to touch them O The Models WH 12DM WR 12DM are equipped with a separate type motor in which the armature is separated from the magnet like a 100 V motor while the previous models are equipped with an integrated type motor contained in a steel case Thanks to the new separate type motor the steel case is eliminated and the motor section is downsized In addition the hammer case is downsized The overall length of the Models WH 12DM WR 12DM is shortened by 9 mm the girth is shortened by 10 mm and the height is shortened by 19 mm in comparison with the previous models as shown below The Models WH 12DM WR 12DM are convenient for working in narrow places O The weight of the Models WH 12DM WR 12DM is heavier than C by about 80 g because they are equipped with the hook and the gears and the motor are strengthened to enhance the durability and the performance O The Models WH 12DM WR 12DM are easy to handle and well balanced thanks to the change of the handle angle from 5 to 10 to cope with the user demand 15 This is the optimum angle determined in the
32. er with the small motor aja Selling points of the Model WR 12DM Powerful tightening torque 150 N m 1530 kgf cm 1330 in lbs The Model WR 12DM is equipped with the new rare earth magnet motor that is more powerful than the previous model by 30 and the 35 larger hammer With the computer analysis the Model WR 12DM gives optimum impact at tightening bolts and the tightening torque is 27 higher than the previous Model WR 12DH 25 higher than and equivalent to the 14 4 V product Model WR 14DH The Model WR 12DM is mechanically strong thanks to the high strength components such as the 30 stronger anvil and the specially heat treated gears to realize powerful operation Data of measured tightening torque are shown below 1 Tightening torque comparison It should be noted that a M16 F10T bolt was tightened 3 seconds with a hexagon socket 40 mm long in the test The tightening torque of the Model WR 12DM is substantially higher than the previous model Tightening torque kgf cm 2000 1736 in lbs 1800 1562 in lbs 1600 1389 in lbs 1400 1215 in lbs 1200 1042 in lbs 1000 868 in lbs 800 694 in lbs 600 521 in lbs 400 347 in lbs 200 174 in lbs 0 N m 200 180 160 160 140 120 122 114 100 80 60 40 20 0 WR 12DM Fig 1 WR 12DH The data above are intended for reference purposes only because actual tigh
33. f our higher class 14 4 V cordless impact wrench 3 APPLICATIONS e Tightening loosening of small screws tapping screws wood screws bolts nuts etc e Drilling into wood and various other materials with use of optional accessory drill chuck adapter Applicable Markets e Wood product assembly Tightening loosening of wood screws e Construction industry Assembly of scaffolding roofing aluminum sashes fencing etc removal of plastic cones from concrete forms mounting removal of form ties drilling into the wood frames of concrete forms etc e Manufacturing industry Assembly work for automobiles rolling stock shipbuilding agricultural machinery and tools industrial machines steel furniture etc e Utility industry Assembly and installation of electric equipment plumbing facilities air conditioning duct assembly etc sanitary fixtures and various other facilities e Service industry General repair work installation of advertising aids automobile repair assembly of garages and carports storage sheds etc e Various other assembly construction or repair facilities 4 STANDARD EQUIPMENT The Models WH 12DM and WR 12DM come standard with the new type flat battery 1 BL K specification One 1220BL battery NiCad capacity 2 0 Ah UC 14YF2 charger and case 2 2BLFK specification Two EB 1220BL batteries NiCad capacity 2 0 Ah UC 14YF2 charger and case 3 HLFK specification One EB 1230HL battery NiMH cap
34. he convex portion of the Dust Guard Fin 27 22 to the concave portion of the Brush Block 28 25 See Fig 14 e Adjust the notch for locking of the Magnet 26 23 to the protrusion of housing A See Figs 14 and 15 e Position the plate of the Dust Guard Fin 27 24 under the rib of Housing A See Fig 16 Dust Guard Fin Brush Block 28 lt 25 gt 27 24 Magnet 26 23 Concave portion Convex portion Projection Fig 14 Align the projection of housing A to the notch of the Magnet 26 23 Aa TX Ga t cad E L n imen ae Housing A d Mount the DC Speed Control Switch 36 33 to housing A so that the protrusion of the forward reverse lever at the top of the switch is inserted into the U shaped groove of the Pushing Button 37 34 Apply silicone grease KS609 Shin Etsu Chemical Co Ltd to the contacting surfaces of the FET of the DC Speed Control Switch 36 lt 33 gt and the Dust Guard Fin 27 24 then mount them to housing A Note The temperature of the FET may be high if the silicone grease is not applied Make sure that the three internal wires from the FET are passed above the DC Speed Control Switch 36 33 see Fig 16 2 Mount the Strap 41 38 to housing A and apply silicone rubber ThreeBond 1211 to housing A as shown
35. he nylon resin and the elastomer resin to be molded continuously in the same die in a short cycle by sliding the die The nylon resin and the elastomer resin are adhered by fusion because the nylon resin is covered with the elastomer resin while it is still hot and thus the firm laminate can be made manufactured using the latest facilities in Yamagata Plant 5 New flat battery interchangeable There are user requests for a new cordless impact driver that can stand upright stably and can also be operated on the conventional batteries chargers The new flat batteries for the Models WH 12DM WR 12DM have low height and wide bottom enough to stand the Models WH 12DM WR 12DM upright and are interchangeable with the conventional stand up batteries including EB 12B 1 5 times higher capacity NiCad 6 Low operating noise 3 dB with respect to the previous model Although the previous models give shrill noise the operating noise of the Models WH 12DM WR 12DM is low and dull thanks to the large hammer and the optimized impact timing without increasing the revolution Thus the large hammer tightens screws powerfully with low operating noise Refer to page 25 for details batteries are usable B type batteries The carbon brushes are replaceable and the armature is singly replaceable thanks to the separate type motor like a 100 V motor 8 Others The Models WH 12DM WR 12DM have the following features common to the previous
36. ightening torque but could also easily cause damage to the socket Please refer to the tables in Para 6 2 for appropriate socket dimensions 3 Hammering section lubrication Grease ATTOLUB MS No 2 is utilized in the hammering section Frequent or continuous use of the tool will cause excessive temperature rise of the hammering section resulting in depletion of the grease and subsequent increased wear of components which will in turn cause loss of tightening efficiency Accordingly itis necessary to periodically replenish the grease in the hammering section to ensure proper lubrication of moving and sliding components 4 Vent holes in the handle Do not stop up or cover the holes on either face of the handle They are essential for ventilation 30 10 REPAIR GUIDE WARNING Without fail remove the Model EB 1220BL or EB 1230HL Battery from the main body before starting repair or maintenance work Because the tool is cordless if the battery is left in and the switch is activated inadvertently the motor will start rotating unexpectedly which could cause serious injury 10 1 Precautions in Disassembly and Reassembly The bold and lt bold gt numbers correspond to the item numbers in the Parts List and the exploded assembly diagram WH 12DM lt gt WR 12DM 10 1 1 Disassembly 1 Removal of Guide Sleeve A 4 Model WH 12DM only Remove the Retaining Ring 1 Washer D 2 Guide Spring 3 and Guide S
37. ility in continuous operation improved cooling efficiency Temperature rise is reduced to half of C thanks to the 1 4 times thicker winding than C powerful rare earth magnet motor made in Hitachi Koki large fan and optimum air ducts Improved dust resistance Ball bearings with contact seals Labyrinth construction Long service life The gears and the motor section are strengthened to realize powerful operation Convenient Comfortable handle grip e Shaped to comfortably fit the operator s thumb Slim grip Soft and slip resistant grip Two kinds of resins are firmly adhered by fusion in the new double layer molding process M DSI Rubber cap and soft material To protect the main body and the workpiece and to prevent slipping Patent applied for Conventional 1 5 times batteries are usable higher capacity Interchangeable 2 Cordless Impact Driver WR 12DM Powerful tightening torque 150 1530 kgf cm 1330 in lbs WR 12DH 118 N m 1200 kgf cm 1040 in lbs C 120 N m WR 14DH 14 4 V product 147 N m 1500 kgf cm 1302 in Ibs Selling points common to the Model WH 12DM e Newly designed compact body Ergonomically designed comfortable handle slip resistant double molded grip Convenient one touch hook Stable flat battery interchangeable High durability dust resistance and Compact body long service life Overall length of th
38. ilot lamp is lit temperature possible Flickers is faulty High battery 5 ON Charging not possible Lit tays consianty because storage battery temperature is too high 6 2 Optional Accessories 1 Optional accessories for the Model WH 12DM e Plus driver bit e Bit No Code No nonni No 2 992671 DEN No 3 992672 e Hexagon socket Stamped figures L5 itat ME Part name Stamped figures Code No mm mm 5 mm Hexagon socket 8 65 2 9 16 8 5 16 996177 6 mm Hexagon socket 10 65 2 9 16 10 3 8 985329 5 16 Hexagon socket 12 65 2 9 16 12 15 32 996178 8 mm Hexagon socket 13 65 2 9 16 3 1 2 996179 10 mm Hexagon socket small type 14 5 2 9 16 4 9 16 996180 10 mm Hexagon socket 16 5 2 9 16 6 5 8 996181 10 mm Hexagon socket 17 5 2 9 16 7 21 32 996182 1 2 Hexagon long socket 21 166 6 17 32 1 53 64 996197 e Woodworking drill bit Code No 959183 15 eDrill chuck adaptor set Code No 996195 The drill chuck adaptor set permits mounting of various types of locally available drill bits for a variety of drilling operations 2 Optional accessories for the Model WR 12DM eEach dimension and applicable bolt for each hexagon socket Shape B Shape C ZE E ls Square d Nominal
39. in Fig 16 Mount housing B to housing A and secure them with seven Tapping Screws W Flange D4 x 20 Black 31 28 Wipe the silicone rubber coming out of the housing with a cloth Apply silicone rubber Position the plate of the Dust Guard Fin 27 lt 24 gt under the rib of housing A 3 Mounting the mechanical parts a Put Washer S 15 lt 12 gt onto the shaft of the Spindle 17 lt 14 gt and mount the Hammer 11 lt 8 gt containing the twenty eight Steel Balls D3 175 12 lt 9 gt Washer J 13 lt 10 gt and the Hammer Spring 14 lt 11 gt to the Spindle 17 lt 14 gt b Align the top of the cam groove on the Spindle 17 lt 14 gt with the steel ball guide groove on the Hammer 11 lt 8 gt as illustrated in Fig 10 Press down either of the raised faces of the Hammer 11 lt 8 gt with a hand press to compress the Hammer Spring 14 lt 11 gt until the end surface of the hammer contacts the Spindle 17 lt 14 gt 36 Insert the two Steel Balls D5 556 10 7 into the steel ball guide groove Check that the steel balls are properly inserted in the cam groove Then release the hand press d Mount the hammer assembly onto the J297 base for washer S With a hand press push down the top of the Spindle 17 14 to compress the Hammer Spring 14 lt 11 gt On this condition mount the Stopper 16 13 onto the spindle shaft and then release the hand press
40. indicated the unit If this order is reversed the charger may not function properly 4 Ensure the power source voltage is the same as that indicated on the Name Plate of the charger Use of any other power source DC outlet fuel powered generator etc will cause the charger to overheat and burn out 5 Do not use any voltage increasing equipment transformer etc between the power source and the charger If the charger is used with voltage over and above that indicated on the unit it will not function properly 6 Conduct battery charging at an ambient temperature range of 0 C 40 32 F 104 F Special temperature sensitive devices are employed in the charger to permit rapid charging Ensure that customers are instructed to use the charger at the indicated ambient temperature range At temperatures under 0 C 32 F the thermostat will not function properly and the storage battery may be over charged At temperatures over 40 C 104 F the storage battery cannot be sufficiently charged The optimum temperature range is 20 C 25 C 68 F 77 F 7 The battery charger should not be used continuously At high ambient temperatures if over three storage batteries are charged in succession the temperature of the coils on the transformer will rise and there is a chance that the temperature fuse inserted in the interior of the transformer will inadvertently melt After charging one battery please charge
41. ing the safest and most efficient use of these tools by all our customers it is very important that at the time of sale the salesperson carefully ensures that the buyer seriously recognizes the importance of the contents of the Handling Instructions and fully understands the meaning of the precautions listed on the Caution Plate and Name Plate attached to each tool A Handling Instructions Salespersons must be thoroughly familiar with the contents of the Handling Instructions in order to give pertinent advice to the customer In particular they must have a thorough understanding of the precautions in the use of the cordless battery charger type electric power tools which are different from those of ordinary electric power tools 1 Before use ensure that the unit is fully charged New units are not fully charged Even if the units were fully charged at the factory long periods without use such as during shipping cause the storage battery to lose its charge Customers must be instructed to fully charge the unit prior to use 2 When charging storage batteries use only the exclusive Model UC 14YF2 Charger provided with the tool Because of the designed rapid charging feature about one hour use of other battery chargers is hazardous 3 Follow prescribed steps in using the charger First connect the 12 Storage Battery to the Model UC 14YF2 Charger then plug the charger into an outlet ensuring that the voltage matches that
42. ious model by 30 and the 35 larger hammer With the computer analysis the Model WH 12DM gives optimum impact at tightening screws and the tightening speed is 30 higher than the previous model 10 higher than C The Model WH 12DM can also tighten long screws at high speed even into a hard wood workpiece Tightening time comparison of the Model WH 12DM with C is shown below Refer to pages 23 and later for detailed data on the tightening time and the working capacity Tightening time comparison Wood screw 5 3 mm dia x 120 mm length hemlock spruce Fast Slow Model 1 2 3 4 5 6 7 8 9 10 sec HITACHI WH 12DM 6 5 sec HITACHI WH 12DH f 9 5 C wa 72 sec Tightening time may vary depending on hardness of the workpiece ambient temperature characteristics of the battery etc Maximum tightening torque 100 N m 1020 kgf cm 885 in lbs The Model WH 12DM is equipped with a powerful motor having 3396 larger volume of the armature and 1 4 times thicker winding 2 times larger cross section of the conductor than C to reduce temperature rise Because the tightening torque is the same in both forward and reverse rotations the tightening torque is not reduced even when loosening bolts this is the same feature in the previous models C s speed and tightening torque in reverse direction are lower than those in forward direction because the position of the motor brush is shifted to obtain high pow
43. leeve A 4 in order by following the procedure shown in Figs 8 1 to 8 4 Be sure not to lose the two Steel Balls D3 5 8 in Anvil C 9 Small flat blade screwdriver Anvil C 9 Retaining Ring 1 Washer D 2 Gap of retaining ring Guide Sleeve A 4 2522 Fig 8 1 Hold the body and adjust the of the retaining Press down the Washer D with the small flat blade ring to the groove of anvil C then insert a small screwdriver flat blade screwdriver into the groove at an angle keZ ON Sy Fig 85 4 Slide the small flat blade screwdriver under one side Slowly raise the retaining ring using the end face of of the gap of the retaining ring guide sleeve A as a fulcrum Then slowly raise the other side of the retainer ring with the small flat blade screwdriver until it is free Avoid quickly raising the retainer ring or it may fly out forcefully 31 2 Removal of the Hammer 7 and the hammer assembly Remove the four Tapping Screws W SP Washer D4 x 25 Black 6 2 that connect the Hammer Case 7 3 with Housing B Set 33 30 and remove the Hammer Case 7 3 and the hammer assembly from Housing A B Set 33 30 Mount the hammer assembly onto the 3 Disassembly of the hammer assembly J 297 base for washer S With a hand press push down the top of the Spindle 17 lt 14 gt to compress the Hammer
44. ly removed from the Magnet 26 23 by pulling it in the B direction see Fig 11 because it is mounted to the Magnet 26 lt 23 gt magnetically B Inner Cover 24 lt 21 gt Magnet 26 lt 23 gt Inner Cover 24 lt 21 gt Armature Ass y 25 lt 22 gt Damper 23 lt 20 gt Armature Ass y Pinion 25 lt 22 gt Ring Gear 20 lt 17 gt Armature Ass y Pinion 25 lt 22 gt Dust Guard Fin 27 lt 24 gt Adjust the convex of the dust guard fin to the concave of the brush block Brush Block 28 lt 25 gt Fig 11 99 10 Removal of the Armature Ass y 25 22 20 17 Support the Inner Cover 24 21 so that it does not contact the LEOS IES fan of the Armature Ass y 25 lt 22 gt With a hand press push 21 lt 18 gt down the tip portion of Armature Ass y pinion 25 lt 22 gt to 22 lt 19 gt remove it 23 lt 20 gt 11 Removal of the Ring Gear 20 17 and the Damper 23 20 24 lt 21 gt Remove the Ring Gear 20 17 from the Inner Cover 24 21 and remove the Damper 23 20 with a small flat blade screwdriver xN Fig 12 key 10 1 2 Reassembly Reassembly can be accomplished by following the disassembly procedures in reverse However special attention should be given to the following items 1 Reassembly of the housing assembly a Be sure to follow the wiring diagram
45. m Tightening torque Tightening torque kgf cm in Ibs 1000 868 800 694 600 521 400 347 200 174 kgf cm in lbs 1400 1215 1200 1642 1000 868 800 694 600 521 400 347 200 174 0 The following bolts were utilized Ordinary bolt strength grade 4 8 High strength bolt strengh grade 12 9 T 3 8 x 1 3 6 Nm M10 x 30 _ 100 High strength bolt L 80 L 60 40 Ordinary bolt 20 09 1 2 3 Tightening time sec Steel plate thickness t 3 8 10 mm Fig 6 1 140 L 120 L 100 L 80 60 L 40 15 32 x 1 3 4 M12 x 45 High strength bolt Ordinary bolt 20 L 0 0 1 2 3 Tightening time sec Steel plate thickness t 1 25 mm Fig 6 2 22 Strength grade is read as follows 4 8 kgf cm in lbs 1200 1042 1000 868 800 694 600 521 Tightening torque 400 347 200 174 0 kgf cm in lbs 1600 1389 1400 1215 1200 1042 1000 868 800 694 600 521 Tightening torque 400 347 200 174 0 Yield point or durable force 45 500 psi Tensile strength of the bolt 56 900 psi 15 32 x 1 3 4 M12 x 45 120 High strength bolt 100 80 60 40 Ordinary bolt
46. models e The thickness of the silver plating over the terminal is changed from u to 30 u 10 times thicker for longer service life of the terminal In addition the terminal is movable according to the movement of the battery to prevent damage to the contact portion The contact between the housing and the battery is changed from line contact to surface contact to minimize rattling due to wear e To cope with the initial galling of the anvil a hardened steel metal with an oil groove for retaining grease C powder sintered no groove is provided at the tip and a dust resistant seal is provided inside the metal the effect has already been proved by the Model WH 12DC2 Reference Motor comparison of the Model WH 12DM with C is shown below The Model WH 12DM is equipped with a powerful motor having 1 4 times thicker winding larger core diameter and stacking length than In addition the Model WH 12DM is equipped with the full fledged fan having walls at both sides of a blade for powerful cooling while C s fan is simple with only the blades HITACHI WH 12DM 114 g Outside diameter of core 28 0 mm Stacking length of core 16 0 mm Diameter of winding 0 6 mm Outside diameter of core 30 5 mm Stacking length of core 17 0 mm Diameter of winding 0 85 mm Selling points of the Model WH 12DM e Class top tightening speed The Model WH 12DM is equipped with the new rare earth magnet motor that is more powerful than the prev
47. nd decrease in speed due to temperature rise The motor is manufactured using the latest facilities in Yamagata Plant Temperature 250 Burnout 200 150 100 WH 12DM 1 battery 2 batteries batteries 50 0 As shown in the above graph C produces smoke when operating on one battery When tightening wood screws 5 3 mm diameter 120 mm long into a workpiece hemlock spruce continuously it suddenly takes much time to tighten the tenth and the later screws This is because thin wires used in the armature assembly of C are apt to produce heat and the cooling construction is insufficient to reduce the heat Flow of cooling air around the armature E Large radial fan m EE 2 Improved dust resistance The dust resistant contact seal bearings are provided at the commutator side and the fan side Thanks to the new bearings hermeticity is enhanced because the seals of the bearings always contact the inner rings C non contact bearings The labyrinth construction is provided between the housing and the fan at the pinion side as shown in the figure below to ensure protection against dust because the pinion side must have high durability against heavy loads The air inlet is minimized and the powerful fan discharges dust if entered Labyrinth The labyrinth construction ensures protection against dust Dust resistance is improved thanks to the cont
48. ngle phase AC 50 60 Hz Voltage Depending on the order specification Power input 44 W Charging system Constant current charge with full wave phase control Overcharge protection system 1 Battery voltage detection A V system 2 Battery surface temperature detection thermostat or thermistor 3 120 minute timer Output voltage 7 2 V 14 4 Output current 1 9 A Charging time Approx 60 minutes for BL type storage battery at 20 C Approx 90 minutes for HL type storage battery at 20 C Product weight 1 3 kg Operable ambient temperature range 0 C 40 C The maximum allowable temperature of the EB 1220BL type battery is 60 C and the EB 1230HL type battery is 45 C 1 In the case of tapping screws and wood screws a minimum of 1 8 is possible This torque is based on tightening an M12 15 32 bolt strength grade 12 9 for 3 seconds with a hexagonal socket 3 This torque is based on tightening an M16 5 8 bolt F10T for 3 seconds with a hexagonal socket 4 Main body does not include accessory tools hexagonal bit etc 14 Pilot lamp indications Model UC 14 2 Prior to charging Blinks 0 5 sec ON 0 5 sec OFF BH gm mmm Red pilot lamp During charging Lit Stays ON constantly remains lit or flashes Charging completed Blinks 0 5 sec ON 0 5 sec OFF mm mm Charging not 0 1 sec ON 0 1 sec OFF Storage battery or charger Green p
49. o a workpiece quickly Tightening time sec wo N WR 12DM WR 12DH Fig 3 The data above are intended for reference purposes only because actual time required for sinking washers will vary depending on tightening conditions The 30 higher power motor and the 35 larger hammer are the main factors that increase the tightening torque of the Model WR 12DM substantially Comparison of hammer and number of strokes are shown below 12 4 Comparison of hammer and number of strokes Thanks to the larger hammer higher hammer inertia J than the previous model the number of strokes N of the Model WR 12DM is increased As a guide stroking force is proportional for J X Therefore when the J X of the Model WR 12DH is 100 the J X of the Model WR 12DM is about 1 5 times larger than the Model WR 12DH as shown in the table below WR 12DM WR 12DH Model Unit WH 12DM WR 12DM Voltage 12 12 Outside diameter of hammer D mm 39 5 42 Height of hammer H mm 21 16 5 Hammer J kgmm 28 8 31 7 Number of strokes N min No of strokes min 2900 3070 JxN Yo 100 120 2 9 6 SPECIFICATIONS 6 1 Specifications Model Cordless Impact Driver Cordless Wrench Item WH 12DM WR 12DM Capacity Small screw M4 8 5 32 5 16 Ordinary bolt M6 M16 1 4 5 8 Ordinary bolt
50. o their threads or in the worst case cause them to be sheared off This phenomenon is common to all existing impact drivers Particularly when tightening 1 4 or smaller screws tightening time must be kept extremely short 0 5 seconds or less The customer should be advised to carry out several screw tightening operations and adjust the tightening time as necessary by measuring the tightening torque with an appropriate torque wrench or driver before commencing continuous operation 8 3 Tightening Torque Variation The tightening torque of the cordless impact driver or wrench may vary slightly in accordance with the factors described below Salespersons are requested to advise the customer to confirm that appropriate tightening torque is obtained by measuring the torque with an appropriate torque wrench or torque driver at the beginning of the tightening operations and as necessary during the tightening operations In addition the torque values shown in Para 7 3 2 above are useful as a handy reference and may be utilized as tentative standards 1 Voltage of battery Tightening torque is affected by the voltage output of the battery For example the relationship between tightening torque and the number of M16 x 55 mm 5 8 x 2 5 32 F10T bolts tightened is shown in Fig 7 below As can be seen in the graph tightening torque decreases as the number of bolts tightened increases This phenomenon is caused by the decline in voltage outpu
51. quires high startup current Thus the number of machine screws driven per charge is different as shown above 2 Ordinary bolt Cordless impact wrench Model HITACHI Tightening condition WR 12DM WR 12DH Battery EB 1220BL EB 12B M10 3 8 Number of bolts 755 755 ordinary bolt Time sec 0 4 0 5 M12 15 32 Number of bolts 475 475 ordinary bolt Time sec 0 6 0 8 M14 9 16 Number of bolts 335 335 ordinary bolt Time sec 0 9 1 2 24 7 6 Actual Noise When Tightening Wood Screws and Bolts 1 Actual noise when tightening wood screws The comparison data when tightening a wood screw 4 5 mm in diameter and 90 mm in length into a cedar workpiece are shown below The data below are intended for reference purposes only because actual noise will vary depending on the types of workpieces hardness etc Measuring conditions a Wood screws 4 5 mm in diameter and 90 mm in length and cedar workpieces b Battery voltage 12 V A range distance 1 m c Average of tightening 5 screws Actual noise Tightening time WH 12DM WH 12DH C 2 Actual noise when tightening bolts Measuring conditions 12 bolts b Battery voltage 12 V A range c Average of tightening 5 screws Actual noise WH 12DM WH 12DH C 25 8 PRECAUTIONS SALES PROMOTION 8 1 Safety Instructions In the interest of promot
52. rench Model WR 12DM 2 MARKETING OBJECTIVE Qwing to the shift of demand from nails to screws and increased demand for long screws there is a market need for a powerful high speed compact and easy to handle impact driver that provides more efficient operation per charge The new cordless impact driver Model WH 12DM Super Impact 12 is the upgraded version of the previous Model WH 12DH developed under the concept for more compact powerful and convenient model to plainly differentiate it from the competitors Thanks to the new development production technologies such as computer analysis for optimum impacting operation and air ducts 3 D CAD engineering and mold designing double layer molding blow molding and the new rare earth magnet motor the Model WH 12DM provides the following features to respond to the user requests 30 higher speed than the previous model functions including hook and bit holder eHigh durability eNew type flat battery e Comfortable handle grip The new cordless impact driver Model WH 12DM Super Impact 12 is the standard model of the Super Impact series This Super Impact 12 is expected to expand our market share of the cordless impact products The new cordless impact wrench Model WR 12DM Super Wrench 12 is also brought out The Model WR 12DM has the maximum tightening torque of 150 N m It is substantially higher than the previous Model WR 12DH and equivalent to the tightening torque o
53. rt Code i a Socket primary dimensions mm ou A s High ie in Du H mm q strength Ordinary Small type L L Le Di 12 955138 1 M8 5 16 W 5 16 12 15 32 B 52 2 3 64 20 25 32 34 1 11 32 20 25 32 13 955139 8 5 16 13 1 2 B 52 2 3 64 20 25 32 a4 1 11 32 21 5 53 64 14mm 955140 M10 328 14 946 52 2 3 64 20 25 32 a4 1 11 32 22 7 8 17 955141 M10 8 8 M12 15 32 w e 17 21 32 52 2 3 64 24 15 16 34 1 11 32 25 17 23 17mm 966149 M10 88 M12 15 82 wave 17 21 82 75 5 16 24 15 16 572 114 26477 127mm 9 19mm gssi42 12 15 32 M 14 9 6 W 7 16 19 23 32 52 2 3 64 24 15 16 34 1 11 32 28 1 3 32 Lc M Pc mamami ws 12 15 82 M 14 9 6 w 7 16 19 23 32 75 2 15 16 24 15 16 57 2 1 4 28 1 3 82 5 21mm 955143 wa 21 53 64 52 2 3 64 24 15 16 34 1 11 32 31 1 7 82 21 955151 wie 21 53 64 175 2 15 16 24 15 16 57 2 1 4 31 1 7 32 21mm 991480 wie 21 53 64 1254 7517 24 15 16 107 4 7 82 31 1 7 82 22 955144 M 12 15 32 14 916 M16 5 8 22 78 52 2 3 64 24 15 16 34 1 11 32 32 5 1 9 32 24 955146 M16 5 8 M18 23122 24 15 16 52 2 3 64 25 63 64
54. t of the battery due to the increasing number of bolts tightened particular the tightening torque decreases rapidly just before the battery is fully discharged range a in the graph As this phenomenon is an inherent drawback in any cordless impact driver salespersons are requested to ensure that the customer is fully aware of and understands this characteristic Model WR 12DM N m M16 55 5 8 2 5 32 F10T tightening time sec 1 600 160 12 1 89 210 3 1 200 120 gl 1032 IMPS When fully charged D gt gt 800 80 5 T 8 694in bs digli 400 40 2 347 in Ibs When fully discharged 0 20 40 60 80 100 120 140 pcs Number of bolts driven per charge EB 1230HL battery Fig 7 28 2 Effects of low ambient temperatures The tightening torque required may be reduced at low ambient temperatures or under the influence of grease and different torque coefficients dependent on manufacturing and finishing processes and specified by bolt manufacturers 3 Different bolt diameter Differences in bolt diameter will cause variation of the required levels of tightening torque Generally speaking tightening torque is higher for large bolis 4 Different materials being tightened When a bolt is tightened into a soft material such as aluminum plastic wood etc the tightening torque is considerably less than
55. tening torque will vary depending on tightening conditions To describe the merit of high tightening torque the comparison data among the Model WR 12DM the previous Model WR 12DH and C are shown in Figures 2 and 3 Figure 2 shows the time required for loosening a high strength bolt and Figure 3 shows the time required for sinking a square washer into a wood workpiece 2 Loosening time comparison high strength bolis Figure 2 shows the time comparison when loosening an M16 bolt that was statically tightened at 200 N m 12040 kgf cm 1770 in lbs with a torque wrench The Model WR 12DM can loosen an M16 bolt in half time of the previous Model WR 12DH addition the Model WR 12DM can loosen bolts that cannot be loosened by the previous Model WR 12DH It is very convenient for loosening bolts that secure molding boxes AL Loosening time sec A WR 12DM WR 12DH Fig 2 The data above are intended for reference purposes only because actual loosening torque will vary depending on tightening conditions 3 Sinking time comparison square washers Figure shows the time required for tightening an M12 bolt into a pine laminated lumber of 105 mm square until the square washers at both sides are sunk into the lumber by 1 3 mm respectively The Model WR 12DM can tighten strap bolts and corner bracings used in Japanese wooden buildings speedily as it can sink washers int
56. the next battery after about a fifteen minute interval 8 The charger case is equipped with air vents to protect the internal electronic components from overheating Caution the customer not to allow foreign materials such as metallic or flammable objects to be dropped or inserted into the air vents This could cause electric shock fire or other serious hazards 96 9 Do not attempt to disassemble the storage battery or the charger Special devices such as a thermostat are built into the storage battery and charger to permit rapid charging Incorrect parts replacement and or wiring will cause malfunctions which could result in fire or other hazards Instruct the customer to bring these units to an authorized service center in the event repair or replacement is necessary 10 Disposal of the Type EB 1220BL or 1230HL Storage Battery Ensure that all customers understand that Type 1220BL or EB 1230HL Storage Batteries should be turned into any Hitachi power tool sales outlet or authorized service center when they are no longer capable of being recharged or repaired If thrown into a fire the batteries may explode or if discarded indiscriminately leakage of the cadmium compound contained in the battery may cause environmental pollution B Caution Plates 1 The following precautions are listed on the Name Plate or Caution Plate attached to the main body of each tool For the U S A excludes French or Canada WARNING
57. tightening torque T k d p T Appropriate tightening torque kgf cm d Nominal diameter for the screw mm p Recommended axial tightening force to be applied to the screw kgf p rated axial stress kgf cm x 0 8 x effective sectional area of the thread mm k Torque coefficient 0 17 e Strength grade and rated axial stress of threads Table 1 Strength grade 4 8 6 8 8 8 12 9 Rated axial stress kgf mm 29 1 43 7 58 2 95 Material Mild steel Alloy steel including Ni Mn Cr etc Heat treatment None Processed hard material e Diameter and effective sectional areas of threads Table 2 Kind of thread x pitch M5 x 0 8 x 1 M8 x 1 25 mm M10 x 1 5 mm M12 x 1 75 M14 x 2 M16 x 2 of thread x pitch gaen 1 4 5 16 3 18 15 32 9 16 5 8 SCRIVE sacionalarea i 20 1 36 6 58 0 84 3 115 157 of thread mm eThread diameter and appropriate tightening torque Strength grade 12 9 high strength bolt f kgf cm Nm 1600 160 1389 in Ibs 1400 140 1215 in Ibs 1200 120 1042 in Ibs 100 Strength grade 8 8 high strength bolt 1000 868 in lbs 800 80 694 in Ibs 600 521 in lbs Strength grade 6 8 ordinary bolt 400 347 in lbs Strength grade 4 8 ordinary bolt 200 174 in lbs 0 0 8 5 16 10 12 14 16 mm 3 8 15
58. when the bolt is tightened into a hard material such as steel 5 Different tightening conditions The tightening torque may vary in accordance with bolt torque coefficient dependent on manufacturing process and specified by bolt manufactures bolt grade and bolt length even though the dimensions of the bolts are the same Tightening torque may also vary depending on the surface finishing state of tightening materials steel aluminum etc and materials to be tightened In addition if there is seal packing clearance etc between tightening materials the tightening torque is decreased 6 Wear and looseness of the socket With extended use the hexagonal portion of the socket which is fitted to the head of the bolt or drill bit and or hexagonal portion of the driver chuck which is fitted onto the anvil in the main body will become worn loose Wear and looseness will cause a proportionate loss of tightening torque In addition use of incorrect size socket slightly larger than the bolt being tightened will also result in decreased torque 7 Bolt and nut rotate together Tightening torque that can be achieved will be considerably decreased if the bolt and nut rotate together during the tightening operation The customer should be advised to carefully observe the operation and ensure this does not occur 8 4 Suggestions and Precautions for the Efficient Use of the Charger 1 Batteries may not be rechargeable immediately

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