5. About the engine
74
Tightening Torque of General Bolts
Please refer to the following tightening torque for the bolts
which are not listed in Tightening Torque of Main Parts.
1. Tightening Torque of General Bolts
Note) The standard torque values above are about 70% of
the bolt elastic limit values.
Note) The tensile force has been calculated by multiplying
the tensile strength with the screw cross-sectional
area.
Note) A special screw should be tightened with 85% of the
tightening torque of the standard value. For example,
a MoS2-coated screw should be tightened with 60% of
the tightening torque of the standard value.
Nominal
Diameter ×
Pitch (mm)
Strength Classification
3.6 4.6 4.8 5.6 5.8 6.6 6.8 6.9 8.8 10.9 12.9
(4A) (4D) (4S) (5D) (5S) (6D) (6S) (6G) (8G) (10K) (12K)
Elastic Limit Value (kg/mm
2
)
20 24 32 30 40 36 46 54 64 90 106
Tightening Torque (kg·m)
M5 0.15 0.16 0.25 0.22 0.31 0.28 0.43 0.48 0.5 0.75 0.9
M6 0.28 0.30 0.45 0.4 0.55 0.47 0.77 0.85 0.9 1.25 1.5
M7 0.43 0.46 0.7 0.63 0.83 0.78 1.2 1.3 1.4 1.95 2.35
M8 0.7 0.75 1.1 1 1.4 1.25 1.9 2.1 2.2 3.1 3.8
M8 x 1 0.73 0.8 1.2 1.1 1.5 1.34 2.1 2.3 2.4 3.35 4.1
M10 1.35 1.4 2.2 1.9 2.7 2.35 3.7 4.2 4.4 6.2 7.4
M10 x 1 1.5 1.6 2.5 2.1 3.1 2.8 4.3 4.9 5 7 8.4
M12 2.4 2.5 3.7 3.3 4.7 4.2 6.3 7.2 7.5 10.5 12.5
M12 x 1.5 2.55 2.7 4 3.5 5 4.6 6.8 7.7 8 11.2 13.4
M14 3.7 3.9 6 5.2 7.5 7 10 11.5 12 17 20
M14 x 1.5 4.1 4.3 6.6 5.7 8.3 7.5 11.1 12.5 13 18.5 22
M16 5.6 6 9 8 11.5 10.5 17.9 18.5 18 26 31
M16 x 1.5 6.2 6.5 9.7 8.6 12.5 11.3 17 19.5 20 28 33
M18 7.8 8.3 12.5 11 16 14.5 21 24.2 25 36 43
M18 x 1.5 9.1 9.5 14.5 12.5 18.5 16.7 24.5 27.5 28 41 49
M20 11.5121816221931.535365160
M20 x 1.5 12.8 13.5 20.5 18 25 22.5 35 39.5 41 58 68
M22 15.51624.52130264246496775
M22 x 1.5 1718.5282434294752567585
M24 20.521.5332740345558638292
M24 x 1.5 23253731453861677493103
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