Makita BFT121F Technical Information Download Page 1

BFT121F

Cordless Screwdriver 12V

Models No.

 Description

PRODUCT

C

ONCEPTION AND MAIN APPLICATIONS

 

S

pecification

S

tandard equipment

O

ptional accessories

< Note >  The standard equipment for the tool shown may differ from country to country.

P 1 / 12

T

ECHNICAL INFORMATION

Dimensions : mm  ( " )

Width ( W )

Height ( H )

Length ( L )

174 (6-7/8)

288 (11-11/32)

265 (10-7/16)

71 (2-13/16)

w/ 3.3 Ah battery w/ 2.0 Ah battery

L

H

W

No load speed : min

-1 

= rpm

Driving shank : mm ( " )

Fastening torque : N.m (in.lbs)

Battery

Electric brake

Torque adjustment

LED Job light

Soft starter

Reverse switch

Net Weight : Kg (lbs)

Type of cell

Voltage : V

Capacity : Ah

NiMH

12.0

5 - 12 (44.3 - 106)

6.35 (1/4) Hex

1.5 (3.3) with 2.0 Ah battery
1.7 (3.9) with 3.3 Ah battery

340

Yes

Yes

Yes

Yes

Yes (possible to adjust with adjust grip)

2.0 / 3.3

* Adjust grip for pre-setting torque ...............................  1 pc. (only for Italy and USA.)
* Protector  .....................................................................  1 pc. (only for Germany)

* Protectors (red, blue, yellow)
* Adjust grip for pre-setting torque 
* Grip base set
* Grip 37

* Battery BH1220  12V, 2.0Ah
* Battery BH1233  12V, 3.3Ah
* Charger DC24SA
* Charger DC14SA 
* Automatic refreshing adapter ADP03

The above model with built-in job light is the 12V version 
of BFT120F for getting high turning angle in the fastening 
with soft joint.

Summary of Contents for BFT121F

Page 1: ...ustment LED Job light Soft starter Reverse switch Net Weight Kg lbs Type of cell Voltage V Capacity Ah NiMH 12 0 5 12 44 3 106 6 35 1 4 Hex 1 5 3 3 with 2 0 Ah battery 1 7 3 9 with 3 3 Ah battery 340 Yes Yes Yes Yes Yes possible to adjust with adjust grip 2 0 3 3 Adjust grip for pre setting torque 1 pc only for Italy and USA Protector 1 pc only for Germany Protectors red blue yellow Adjust grip fo...

Page 2: ...pcs Inner gear 46 Teeth portion 44 1 pcs Internal Inner gear Teeth portion Teeth portion The 4 shafts for accepting 40 Helical gears 17 46 1 pc Spur gear 10 complete The 4 shafts for accepting 47 Spur gears 31 29 3 pcs 3 pcs Steel balls 4 Approx 0 1 g in total 38 31 1 pc Spindle Approx 0 9 g 1 pc Approx 0 1 g 47 Spur gear 31 2 Disassembling bit holder section Remove ring spring with No 1R291 Retai...

Page 3: ...3x20 See Fig 2 2 Take off housing L And then disconnect the connector of switch unit Separate endbell complete from motor section See Fig 3 3 Separate motor section from gear assembly by turning motor bracket anti clockwise See Fig 4 4 Remove motor bracket with 1R269 Bearing extractor Then armature can be separated from yoke unit See Fig 5 Brush holder cap Carbon brush Pan head screws M3x20 Fig 2 ...

Page 4: ...ection assembled as illustrated in Fig 7 And then mount this motor section to housing R with aligning the flat portion of yoke unit with the rib of housing R Connect the connector of switch unit with the connector of controller See Fig 8 Note Be careful not to be pinched your finger between yoke unit and armature Because armature is pulled toward yoke unit with the strong magnetic force Check the ...

Page 5: ...rews M3x20 See Fig 10 Pin 2 5 Plate Lens Terminal Buzzer circuit F R Change lever LED circuit Plate Lens LED circuit Terminal Terminal F R Change lever Pin 2 5 Be careful not to pinch the lead wire of LED circuit with housing L Pass lead wire between screw hole and the wall of housing R Buzzer circuit Fig 9 Fig 10 Housing L Pan head screws M3x20 ...

Page 6: ... gear case Tapping screws 3x12 Gear case complete Thin washer 30 Compression spring 30 Front cover Spring holder A Thin washer 30 Compression spring 30 Thin washer 24 Torque plate Lock washer Retaining ring S 12 2 pcs of flat washers 12 16 pcs of steel balls 3 Note After removing make sure whether 16 pcs of steel balls 3 are remain or not Fig 13 Fig 14 38 pcs of Steel balls 3 3 pcs of Steel balls ...

Page 7: ... See Fig 19 5 Mount carrier complete A 3 pcs of spur gears 17 38 pcs of steel balls 3 and flat washer 18 See Fig 20 Flat washers 12 Spindle Fig 18 Retaining ring S 12 2 pcs of flat washers 12 16 pcs of steel balls 3 Note Be careful not to lose steel balls 3 in this stage Retaining ring S 12 Flat washer 12 Flat washer 12 Steel ball 3 Spindle Gear case complete Gear case complete Clutch ring Inner g...

Page 8: ... it with 1 pc of tapping screw bind PT3x10 See Fig 24 10 Pushing switch unit toward armature side secure it on holder plate with 1 pc of pan head screw M2 3 x 10 See Fig 25 The fastening torque for pan head screw M2 3 x 10 is approx 0 3 0 4 N m Internal gear case Tapping screws 3x12 Gear case complete Concave portion of gear case assembly Boss portion of internal gear case Fig 21 Fig 22 Spur gear ...

Page 9: ...g switch 1 After separating F R change lever from switch unscrew the screw fastening micro switch and turn the micro switch with pulling it up as illustrated in Fig 27 Then micro switch can be separated from switch 2 When assembling secure micro switch with the fastening torque approx 0 29 0 34 N m 3 Aligning the F R change lever s concave with the boss of switch mount F R change lever to switch S...

Page 10: ...dicator lamp is built in the controller Wiring diagram 1 Connecting the receptacles with the terminals of switch Lead holders Endbell s lead wire black Controller s lead wire blue Controller s lead wire white Micro switch side Housing R side View from micro switch side View from housing R side Hold the following lead wires with lead holders Endbell s lead wire black Controller s lead wire white En...

Page 11: ...nected to buzzer circuit Be careful not to pinch the lead wires between switch and housing when assembling Rib A Pass the following lead wires between rib A and the wall of housing Controller s lead wires black and red to be connected to terminal Controller s lead wires white and red to be connected to buzzer circuit Put the connectors of controller and buzzer circuit between the line and terminal...

Page 12: ... be connected to micro switch Controller s lead wires blue purple and white to be connected to reverse switch Controller s lead wires red and white to be connected to buzzer circuit Put the connectors of controller and buzzer circuit between the line and terminal as illustrated above Terminal Buzzer circuit Connectors Pass the following lead wires between rib A and the wall of housing Controller s...

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