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
TIGHTENING TORQUE CHART
| 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
STANDARD TIGHTENING TORQUE SPECIFICATION
| 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) |