Makita TW0350 User Manual download pdf (Page 7)

OPERATION

The proper fastening torque may differ depending upon the

kind or size of the bolt, the material of the workpiece to be

fastened, etc. The relation between fastening torque and fas-

tening time is shown in the figures.

Hold the tool firmly and place the socket over the bolt or nut.

Turn the tool on and fasten for the proper fastening time.

NOTE:

• When fastening screw M12 (1/2”) or smaller, carefully

adjust pressure on the switch so that the screw is not

damaged.

• Hold the tool pointed straight at the bolt or nut without

applying excessive pressure on the tool.

• If you fasten the bolt for a time longer than shown in the

figures, the bolt or the socket may be overstressed,

damaged, etc. Before starting your job, always perform a

test operation to determine the proper fastening time for

your bolt. Especially for the bolt over than M12 (1/2”),

perform the above test operation to prevent the trouble

on socket or bolt, etc.

The fastening torque is affected by a wide variety of factors

including the following. After fastening, always check the

torque with a torque wrench.

1. Voltage

• Voltage drop will cause a reduction in the fastening

torque.

2. Socket

• Failure to use the correct size socket will cause a

reduction in the fastening torque.

• A worn socket (wear on the hex end or square end)

will cause a reduction in the fastening torque.

3. Bolt

• Even though the torque coefficient and the class of

bolt are the same, the proper fastening torque will

differ according to the diameter of bolt.

• Even though the diameters of bolts are the same, the

proper fastening torque will differ according to the

torque coefficient, the class of bolt and the bolt

length.

0.5 1

1.5

2.5

100

150

200

250

300

Standard bolt

Fastening torque (N.m)

Fastening time (S)

M12X80

(3/4”X3-1/8”)

(5/8”X3-1/8”)

(1/2”X3-1/8”)

M16X80

M20X80

004009

1234

100

150

200

250

300

M16

M16(F10T)

High tensile bolt

Fastening torque (N.m)

Fastening time (S)

(5/8”)

(1/2”X3-1/8”)

(1/2”)

M12X80

M12

004010

1 2 3 4 5 6 7 8 9 10 11 12

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Makita TW0350 User Manual Page 7

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