A simple chart to determine the torque and preload values for 8.8, 10.9 and 12.9 class.
How to read the torque values in the chart
There are some aspects to take into consideration before reading this torque chart for bolts, in fact it must be taken into account that the values indicated are 90% of the yield point. Considering that torque tightening usually does not exceed 70%, approximately 20% less should be calculated to get an indication of the actual tightening values.
Torque Chart For Bolts From M14 to M100
Torque Chart For Smaller Bolts
| BOLT SIZE | PROPERTY CLASS DIN | |||
| THREAD | A/F | 8.8 | 10.9 | 12.9 |
| M6 | 10mm | 9,5 Nm | 14 Nm | 16 Nm |
| M8 | 13mm | 23 Nm | 34 Nm | 40 Nm |
| M10 | 17mm | 46 Nm | 67 Nm | 79 Nm |
| M12 | 19mm | 79 Nm | 116 Nm | 136 Nm |
Standard To Metric Bolt Conversion
| INCH | METRIC |
| 1/4 | M6 |
| 5/16 | M8 |
| 3/8 | 10 |
| 1/2 | M12 |
| 5/8 | M16 |
| 3/4 | M20 |
| 7/8 | M22 |
| 1 | M24 |
| 1.1/8 | M27 |
| 1.1/4 | M30 |
| 1.3/8 | M33 |
| 1.1/2 | M36 |
| 1.3/4 | M42 |
| 2 | M48 |
It might interest you:
Thread Pitch Chart - Metric and Imperial
Size Chart For Bolts - Standard and Metric