22. Standard Tightening Torque for Bolts and Nuts
3-16
Bolts or nuts in the metric system should be tightened at the torque described below unless specified
otherwise.
IMPORTANT
If a part to be tightened is made of resin like a panel board, excessive tightening torque may dam-
age the tightened part. Be careful when tightening.
22-2. Torque table
Item Thread sizepitch Tightening torque ft•lbf (N•m) Remarks
Hexagon bolt (7T)
Nut
Coarse
threads
M6
1 7.23 to 8.68 (9.8 to 11.8) 1) Apply 80% tightening torque
when tightened to aluminum.
2) Apply 60% tightening torque for
4T bolt and lock nut.
3) Use fine thread screws for en-
gine only.
M8
1.25 16.6 to 21.0 (22.6 to 28.4)
M101.5 32.6 to 43.4 (44.1 to 58.8)
M12
1.75 57.9 to 72.3 (78.5 to 98.1)
M14
2 86.8 to 108.5 (117.7 to 147.1)
M16
2 123.0 to 151.9 (166.7 to 206.0)
M18
2.5 173.6 to 209.8 (235.4 to 284.4)
M202.5 238.7 to 296.6 (323.6 to 402.1)
Fine
threads
M14
1.5 94.0 to 108.5 (127.5 to 147.1)
M16
1.5 155.5 to 177.2 (210.8 to 240.3)
PT plug 1/8 7.2 (9.8)
1/4 14.5 (19.6)
3/8 21.7 (29.4)
1/2 43.4 (58.8)
Pipe joint bolt M8 9.4 to 12.3 (12.7 to 16.7)
M12 18.1 to 25.3 (24.5 to 34.3)
M14 28.9 to 36.2 (39.2 to 49.0)
M16 36.2 to 43.4 (49.0 to 58.8)
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