Komatsu 930E-4SE, Operation & Maintenance Manual

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STANDARD CHARTS AND TABLES
STANDARD TIGHTENING TORQUES
STANDARD TIGHTENING
TORQUES
F.8-0000051233
Class 10.9 Capscrews And Class 10 Nuts
The following specifications apply to required
assembly torques for all metric class 10.9 finished
hexagon head capscrews and class 10 nuts.
DO NOT lubricate capscrew threads and seats during
assembly.
These specifications are based on the
following hardware:
• All capscrews
• All nuts
• All hardened washers being phosphate and oil
coated
NOTE: If zinc-plated hardware is used, each piece
must be lubricated with simple lithium base chassis
grease (multi-purpose EP NLGI) or a rust preventive
grease (see list, this page) to achieve the same
clamping forces provided below.
NOTE: Torques are calculated to give a clamping
force of approximately 75% of proof load. The
maximum torque tolerance shall be within ±10% of
the torque value shown.
In the following table under “Capscrew Size”, the first
number represents the shank diameter (mm). The
second number represents thread pitch in millimeters.
Example: M20 x 2.25
M20 = shank diameter (20 mm)
2.25 = thread pitch in millimeters
Table 2-1
Standard Tightening Torque for Metric
Class 10.9 Capscrews & Class 10 Nuts
Capscrew
Size
Torque
N·m
Torque
ft·lb
Torque
kg·m
M6 x1 12 9 1.22
M8 x 1.25 30 22 3.06
M10 x 1.5 55 40 5.61
M12 x 1.75 95 70 9.69
M14 x 2 155 114 15.81
M16 x 2 240 177 24.48
M20 x 2.25 465 343 47.43
M24 x 3 800 590 81.6
M30 x 3.5 1600 1180 163.2
M36 x 4 2750 2028 280.5
930E-4SE 2-3