Panasonic EY6535 Factors Affecting Tightening Torque, Bolt Tightening Conditions

TIGHTENING TORQUE

•The power required for tightening a bolt will vary, according to bolt material and size, as well as the material being bolted. Choose the length of tightening time accordingly.

Reference values are provided below.

(They may vary according to tightening conditions.)

FACTORS AFFECTING TIGHTENING 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 nearly discharged, the voltage decreases and the tightening torque drops.

Bolt Tightening Conditions

N·m M8, M10, M12, M14 x 25 mm Standard bolt

(kgf-cm)				(Bolt size : Millimeters)
	127.4
(1300)						M14
	117.7
(1200)
	98.1
(1000)						M12
	78.5
	(800)
ue
torq	58.8
	(600)
Tightening
	39.2				M10
	(400)
			M8
	19.6
	(200)
	0.1	0.25		0.5	1	2	3
		Tightening time (Sec.)

BoltWasher

Steel plate thickness 10 mm (3/8")

Nut	Washer
	Spring washer

Tightening conditions

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

Explanation of the strength type 4.8

Bolt yield point

(80% of tensile strength) 471 N/mm2 (48 kgf/mm2)

Bolt tensile strength 588 N/mm2 (60 kgf/mm2)

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