5. General Engine Information
53
Tightening Torque of General Bolts
Refer to the following tightening torques for bolts whose tightening torque is not included in the list of the main parts.
1. Tightening torque of general bolts
Note) The standard torque values specified above are based on 70% of the elastic limit of bolts.
Note) The tensile force is the tensile strength multiplied by the cross-sectional area of the screw.
Note) Special screws should be tightened to only 85% of the standard value. For example, a screw coated with MoS2 should
be tightened to only 60% of the standard value.
Name
Dia. × pitch
(mm)
Strength class
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 (kg/mm
2
)
20 24 32 30 40 36 46 54 64 90 106
Tightening torque (kgf·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 × 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 × 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 × 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 × 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 × 1.5 6.2 6.5 9.7 8.6 12.5 11.3 17 19.5 20 28 33
M18 7.8 8.312.511 1614.52124.225 36 43
M18 × 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 × 1.5 12.8 13.5 20.5 18 25 22.5 35 39.5 41 58 68
M22 15.51624.52130264246496775
M22 × 1.51718.5282434294752567585
M24 20.521.5332740345558638292
M24 × 1.523253731453861677493103
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