Standard Torque Values
In the absence of specific torque values, the following chart can be used as a guide to the maximum safe torque for particular size/grade of fastener. There is no torque difference for fine or coarse threads. Torque values are based on dry, clean threads. Reduce value by 10% if threads are oiled before assembly.
Relative Strength Marking | 4.6 | 4.8 | 8.8 or 9.8 | 10.9 | 12.9 | ||||||
---|---|---|---|---|---|---|---|---|---|---|---|
Bolt Markings | 4.6 | 4.8 | 8.8 or 9.8 | 10.9 | 12.9 | ||||||
Dia. | Wrench Size | Max. Torque | Max. Torque | Max. Torque | Max. Torque | Max. Torque | |||||
lb ft | Nm | lb ft | Nm | lb ft | Nm | lb ft | Nm | lb ft | Nm | ||
M3 | 5.5mm | 0.3 | 0.5 | 0.5 | 0.7 | 1 | 1.3 | 1.5 | 2 | 1.5 | 2 |
M4 | 7mm | 0.8 | 1.1 | 1 | 1.5 | 2 | 3 | 3 | 4.5 | 4 | 5 |
M5 | 8mm | 1.5 | 2.5 | 2 | 3 | 4.5 | 6 | 6.5 | 9 | 7.5 | 10 |
M6 | 10mm | 3 | 4 | 4 | 5.5 | 7.5 | 10 | 11 | 15 | 13 | 18 |
M8 | 13mm | 7 | 9.5 | 10 | 13 | 18 | 25 | 26 | 35 | 33 | 45 |
M10 | 16mm | 14 | 19 | 18 | 25 | 37 | 50 | 55 | 75 | 63 | 85 |
M12 | 18mm | 26 | 35 | 33 | 45 | 63 | 85 | 97 | 130 | 111 | 150 |
M14 | 21mm | 37 | 50 | 55 | 75 | 103 | 140 | 151 | 205 | 177 | 240 |
M16 | 24mm | 59 | 80 | 85 | 115 | 159 | 215 | 232 | 315 | 273 | 370 |
M18 | 27mm | 81 | 110 | 118 | 160 | 225 | 305 | 321 | 435 | 376 | 510 |
M20 | 30mm | 118 | 160 | 166 | 225 | 321 | 435 | 457 | 620 | 535 | 725 |
M22 | 33mm | 159 | 215 | 225 | 305 | 435 | 590 | 620 | 840 | 726 | 985 |
M24 | 36mm | 203 | 275 | 288 | 390 | 553 | 750 | 789 | 1070 | 926 | 1255 |
M27 | 41mm | 295 | 400 | 417 | 565 | 811 | 1100 | 1154 | 1565 | 1353 | 1835 |
M30 | 46mm | 402 | 545 | 568 | 770 | 1103 | 1495 | 1571 | 2130 | 1837 | 2490 |
Polymax Standard Size |