Komatsu 4D98 Series - Standard Bolt and Nut Tightening Torques

1. General
1.8 Tightening Torques for Standard Bolts and Nuts
(Lubricating oil not applied)
Nominal thread
Tightening
Item
diameter x pitch
torque Remarks
Nm(kgf-m)
Hexagon bolt (7T)lnut M6xl
9.8-I 1.8 (1.0-l .2)
1) Use 80% of the value at
M 8 x 1.25
22.5-28.4 (2.3-2.9)
left when the tightening
side is aluminum.
MlOx 1.5
44.1-53.9 (4.5-5.5)
2) Use 60% of the value at
left for 4T bolts and lock
M12x1.75
78.4-98 (8.0-10)
nuts.
PT plug
l/8 9.8 (1 .O)
l/4
19.6(2.0)
318 29.4(3.0)
l/2
58.8(6.0)
Pipe joint bolt
M8 12.7-l 6.7 (1.3-l .7)
Ml2 24.5-34.3 (2.5-3.5)
Ml4
39.2-49 (4.0-5.0)
Ml6 49-58.8 (5.0-6.0)
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