Tightening Torque
Each torque value in the table is a standard value for tightening under the following conditions.
- Bolts, nuts and washers are all made of steel and plated with zinc.
- The threads and bearing surface of bolts and nuts are all in dry condition.
The values in the table are not applicable:
- If toothed washers are inserted.
- If plastic parts are fastened.
- If bolts are tightened to plastic or die-cast inserted nuts.
- If self-tapping screws or self-locking nuts are used.
STANDARD BOLT AND NUT TIGHTENING TORQUE
STANDARD BOLT AND NUT TIGHTENING TORQUE
| THREAD SIZE | STANDARD TIGHTENING TORQUE | |||
|---|---|---|---|---|
| NOMINAL BOLT DIAMETER (mm) | PITCH (mm) | HEAD MARK "4" | HEAD MARK "7" | HEAD MARK "8" |
| M5 | 0.8 | 2.5 +/- 0.5 N. m (23 +/- 4 in-lb) | 5.0 +/- 1.0 N. m (44 +/- 9 in-lb) | 6.0 +/- 1.0 N. m (53 +/- 9 in-lb) |
| M6 | 1.0 | 5.0 +/- 1.0 N. m (44 +/- 9 in-lb) | 8.5 +/- 1.5 N. m (76 +/- 13 in-lb) | 10 +/- 2 N. m (89 +/- 17 in-lb) |
| M8 | 1.25 | 11 +/- 2 N. m (98 +/- 17 in-lb) | 20 +/- 4 N. m (15 +/- 3 ft-lb) | 24 +/- 4 N. m (18 +/- 3 ft-lb) |
| M10 | 1.25 | 23 +/- 4 N. m (17 +/- 3 ft-lb) | 42 +/- 8 N. m (31 +/- 6 ft-lb) | 53 +/- 7 N. m (39 +/- 5 ft-lb) |
| M12 | 1.25 | 42 +/- 8 N. m (31 +/- 6 ft-lb) | 80 +/- 10 N. m (59 +/- 7 ft-lb) | 93 +/- 12 N. m (68 +/- 9 ft-lb) |
| M14 | 1.5 | 70 +/- 10 N. m (52 +/- 7 ft-lb) | 130 +/- 20 N. m (96 +/- 15 ft-lb) | 150 +/- 20 N. m (111 +/- 14 ft-lb) |
| M16 | 1.5 | 105 +/- 15 N. m (78 +/- 11 ft-lb) | 195 +/- 25 N. m (144 +/- 18 ft-lb) | 230 +/- 30 N. m (170 +/- 22 ft-lb) |
| M18 | 1.5 | 150 +/- 20 N. m (111 +/- 14 ft-lb) | 290 +/- 40 N. m (214 +/- 29 ft-lb) | 335 +/- 45 N. m (247 +/- 33 ft-lb) |
| M20 | 1.5 | 210 +/- 30 N. m (155 +/- 22 ft-lb) | 400 +/- 60 N. m (295 +/- 44 ft-lb) | 465 +/- 65 N. m (343 +/- 48 ft-lb) |
| M22 | 1.5 | 290 +/- 40 N. m (214 +/- 29 ft-lb) | 540 +/- 80 N. m (398 +/- 59 ft-lb) | 630 +/- 90 N. m (465 +/- 66 ft-lb) |
| M24 | 1.5 | 375 +/- 55 N. m (277 +/- 40 ft-lb) | 705 +/- 105 N. m (520 +/- 77 ft-lb) | 820 +/- 120 N. m (605 +/- 88 ft-lb) |
FLANGE BOLT AND NUT TIGHTENING TORQUE
FLANGE BOLT AND NUT TIGHTENING TORQUE
| THREAD SIZE | STANDARD TIGHTENING TORQUE | |||
|---|---|---|---|---|
| NOMINAL BOLT DIAMETER (mm) | PITCH (mm) | HEAD MARK "4" | HEAD MARK "7" | HEAD MARK "8" |
| M6 | 1.0 | 5.0 +/- 1.0 N. m (44 +/- 9 in-lb) | 10 +/- 2 N. m (89 +/- 17 in-lb) | 12 +/- 2 N. m (107 +/- 17 in-lb) |
| M8 | 1.25 | 13 +/- 2 N. m (111 +/- 22 in-lb) | 24 +/- 4 N. m (18 +/- 3 ft-lb) | 28 +/- 5 N. m (20 +/- 4 ft-lb) |
| M10 | 1.25 | 26 +/- 5 N. m (19 +/- 4 ft-lb) | 50 +/- 5 N. m (37 +/- 4 ft-lb) | 58 +/- 7 N. m (43 +/- 5 ft-lb) |
| M10 | 1.5 | 25 +/- 4 N. m (18 +/- 3 ft-lb) | 46 +/- 8 N. m (34 +/- 6 ft-lb) | 55 +/- 5 N. m (41 +/- 3 ft-lb) |
| M12 | 1.25 | 47 +/- 9 N. m (35 +/- 6 ft-lb) | 93 +/- 12 N. m (68 +/- 9 ft-lb) | 105 +/- 15 N. m (78 +/- 11 ft-lb) |
| M12 | 1.75 | 43 +/- 8 N. m (32 +/- 6 ft-lb) | 83 +/- 12 N. m (61 +/- 9 ft-lb) | 98 +/- 12 N. m (72 +/- 9 ft-lb) |