SERVICE DATA
2-11
2.2 Standard bolt and nut tightening torque
2.2.1 Metric automobile screw thread
2.2.2 Metric course screw thread
Note: (a) This table lists the tightening torque for standard bolts and nuts.
(b) The numerical values in the table are for fasteners with spring washers.
(c) The table shows the standard values with a maximum tolerance value of ±10%.
(d) Use the tightening torque in this table unless otherwise specified.
(e) Do not apply oil to threaded portions. (Dry)
2.3 Standard stud tightening torque
Table 2-14 Metric automobile screw thread
Threads
Dia × Pitch
(mm)
Width
across flats
(mm) [in.]
Strength classification
4T 7T 10.9
N·m kgf·m lbf·ft N·m kgf·m lbf·ft N·m kgf·m lbf·ft
M6 × 1.0 10 [0.39] 3.9 0.4 2.9 8.8 0.9 6.5 12.7 1.3 9.4
M8 × 1.25 12 [0.47] 11.8 1.2 8.7 18 1.9 13 30 3.1 22
M10 × 1.25 14 [0.55] 21.1 2.15 16 35 3.6 26 60 6.1 44
M12 × 1.25 17 [0.67] 35.3 3.6 26 64 6.5 47 108 11.0 80
4 7
10
Table 2-15 Metric course screw thread
Threads
Dia × Pitch
(mm)
Width
across flats
(mm) [in.]
Strength classification
7T 10.9
N·m kgf·m lbf·ft N·m kgf·m lbf·ft
M10 × 1.5 14 [0.55] 32 3.3 24 58 5.9 43
M12 × 1.75 17 [0.67] 57 5.8 42 102 10.4 75
Table 2-16 Standard stud tightening torque
Threads
Dia × Pitch
(mm)
For driving in aluminum materials For driving in ferrous materials
N·m kgf·m lbf·ft N·m kgf·m lbf·ft
M8 × 1.25 5.4 ± 0.5 0.55 ± 0.05 4.0 ± 0.4 13.7 ± 1.0 1.4 ± 0.1 10.1 ± 0.7
M10 × 1.25 12.7 ± 1.0 1.3 ± 0.1 9.4 ± 0.7 23.5 ± 2.0 2.4 ± 0.2 17.4 ± 1.4
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