5. About the engine
76
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.
2. Tightening Torque of Key General Bolts
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
23 25 37 31 45 38 61 67 74 93 103
Nomi-
nal
Diame-
ter ×
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)
Nominal Diameter x
Pitch (mm)
Strength Classification
Remarks
8.8T 10.9T 12.9T
Tightening Torque (kgf·m) ± 10%
M6 x 1 1 1.25 1.5
M8 x 1.25 2.2 3.1 3.8
M8 x 1 2.4 3.35 4.1
M10 x 1.5 4.4 6.2 7.4
M10 x 1.0 5 7 8.4
M12 x 1.75 7.5 10.5 12.5
M12 x 1.5 8 11.2 13.4
M14 x 1.5 13 18.5 22
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