Factors Affecting Tighten ing Torque

The tightening torque is affected by a wide variety of factors including the followings. After tightening, always check the torque with a torque wrench.

1)Voltage

When the battery pack becomes near- ly discharged, the voltage decreases and the tightening torque drops.

Bolt Tightening Conditions

Tightening conditions

•The following bolts are used. Standard bolts: Strength type 4.8 High tensile type 12.9

Explanation of the strength type 4.8

Bolt yield point

(80% of tensile strength)

32 kgf/mm2 (45000psi)

Bolt tensile strength

40 kgf/mm2 (56000psi)

2) Tightening time

Longer tightening time results in increased

Tightening torque

N·m (kgf-cm)

196.0

(2000)

147.0

(1500)

98.0

(1000)

49.0

(500)

M10×35 mm M12, M14, M16 ×45 mm Standard bolt

M16

M14

M12

M10

	tightening torque. Excessive tightening, how
	ever, adds no value and reduces the life of
	the tool.
3)	Different bolt diameters
	The size of the bolt diameter affects the tight
	ening torque.
	Generally, as the bolt diameter increases,
	tightening torque rises.
4)	Tightening conditions

Tightening torque will vary, even with the same bolt, according to grade, length, and torque coefficient (the fixed coefficient indi cated by the manufacturer upon produc tion).

0.0 0.5 1.0 1.5 2.0 2.5 3.0

Tightening torque will vary, even with the

Tightening torque

N·m (kgf-cm)

196.0

(2000)

147.0

(1500)

98.0

(1000)

49.0

(500)

Tightening time (Sec.)

M8, M10×35 mm M12×45 mm High tensile bolt

M12

M10

same bolting material (e.g. steel), accord ing to the surface finish.

Torque is greatly reduced when the bolt and nut start turning together.

5)Socket play

Torque is lowered as the six-sided configu ration of the socket of the wrong size is used to tighten a bolt.

6)Switch (Variable speed control trigger)

Torque is lowered if the unit is used with the switch not fully depressed.

7)Effect of Connecting Adaptor

The tightening torque will be lowered through the use of a universal joint or a connecting adaptor.

0.00.5 1.0 1.5 2.0 2.5 3.0

Tightening time (Sec.)

BoltWasher

Steel plate thickness10 mm (3/8")

Nut Washer Spring washer

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EY7541 specifications

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