Metric Bolt/Screw Torque Chart
A bolt/screw torque chart, also known as a torque specification chart, is a reference table that provides recommended torque values for tightening bolts, screws, and fasteners of various sizes and types. These charts are used in engineering, construction, automotive, and other industries where proper fastener tightening is critical for safety and performance.
Includes the following information:
1.Fastener Size: The chart lists the size of the bolt or screw, usually specified by its diameter and sometimes its length.
2.Fastener Type: It specifies the type of fastener, such as hex bolts, socket head cap screws, or lag screws.
3.Material and Grade: Information about the material and grade or strength class of the fastener. For example, common grades for bolts are 8.8, 10.9, and 12.9.
4.Recommended Torque: The most important part of the chart is the recommended torque value (usually in units like Newton-meters or foot-pounds) to properly tighten the fastener. This value ensures that the fastener is secured with the right amount of force, preventing over-tightening or under-tightening.
| Steel | STAINLESS STEEL | |||||||
| Bolt class | Size socket [mm] | CLASS 5.8 | CLASS 8.8 | CLASS 10.9 | Class 12.9 | 50 | 70 | 80 |
| M1.6 | – | 0,11 Nm | 0,17 Nm | 0,24 Nm | 0,29 Nm | 0,10 Nm | 0,20 Nm | – |
| M2 | – | 0,22 Nm | 0,35 Nm | 0,49 Nm | 0,58 Nm | 0,25 Nm | 0,30 Nm | – |
| M2.2 | – | 0,29 Nm | 0,46 Nm | 0,64 Nm | 0,77 Nm | – | – | – |
| M2.5 | – | 0,44 Nm | 0,70 Nm | 0,98 Nm | 1,20 Nm | 0,45 Nm | 0,60 Nm | – |
| M3 | – | 0,77 Nm | 1,20 Nm | 1,70 Nm | 2,10 Nm | 1,00 Nm | 1,10 Nm | – |
| M3.5 | – | 1,20 Nm | 1,90 Nm | 2,70 Nm | 3,30 Nm | – | – | – |
| M4 | 7 | 1,9 Nm | 2,9 Nm | 4,1 Nm | 4,9 Nm | 0,9 Nm | 2 Nm | 2,7 Nm |
| M5 | 8 | 3,7 Nm | 6 Nm | 8,5 Nm | 10 Nm | 2 Nm | 4 Nm | 5,3 Nm |
| M6 | 10 | 6,4 Nm | 10 Nm | 14 Nm | 17 Nm | 3,2 Nm | 7 Nm | 9 Nm |
| M8 | 13 | 16 Nm | 25 Nm | 35 Nm | 41 Nm | 8 Nm | 17 Nm | 23 Nm |
| M10 | 17 / 16 | 31 Nm | 49 Nm | 69 Nm | 83 Nm | 16 Nm | 33 Nm | 45 Nm |
| M12 | 19 / 18 | 54 Nm | 86 Nm | 120 Nm | 145 Nm | 27 Nm | 58 Nm | 77 Nm |
| M14 | 22 / 21 | 86 Nm | 135 Nm | 190 Nm | 230 Nm | 43 Nm | 93 Nm | 124 Nm |
| M16 | 24 | 130 Nm | 210 Nm | 295 Nm | 355 Nm | 66 Nm | 142 Nm | 190 Nm |
| M18 | 27 | 180 Nm | 290 Nm | 405 Nm | 485 Nm | 93 Nm | 198 Nm | 265 Nm |
| M20 | 30 | 255 Nm | 410 Nm | 580 Nm | 690 Nm | 130 Nm | 278 Nm | 371 Nm |
| M22 | 32 | 345 Nm | 550 Nm | 780 Nm | 930 Nm | 174 Nm | 374 Nm | 499 Nm |
| M24 | 36 | 440 Nm | 710 Nm | 1000 Nm | 1200 Nm | 224 Nm | 480 Nm | 640 Nm |
| M27 | 41 | 650 Nm | 1050 Nm | 1500 Nm | 1800 Nm | 331 Nm | 708 Nm | – |
| M30 | 46 | 880 Nm | 1450 Nm | 2000 Nm | 2400 Nm | 450 Nm | 964 Nm | – |
| M33 | 50 | 1200 Nm | 1900 Nm | 2700 Nm | 3250 Nm | 609 Nm | – | – |
| M36 | 55 | 1550 Nm | 2450 Nm | 3450 Nm | 4150 Nm | 782 Nm | – | – |
| M39 | 60 | 2.000 Nm | 3.200 Nm | 4.500 Nm | 5.400 Nm | 1.013 Nm | – | – |
| M42 | 65 | 2.450 Nm | 3.950 Nm | 5.550 Nm | 6.650 Nm | – | – | – |
| M45 | 70 | 3.100 Nm | 4.950 Nm | 6.950 Nm | 8.350 Nm | – | – | – |
| M48 | 75 | 3.750 Nm | 5.950 Nm | 8.400 Nm | 10.100 Nm | – | – | – |
| M52 | 80 | 4.800 Nm | 7.650 Nm | 10.800 Nm | 12.900 Nm | – | – | – |
| M56 | 85 | 5.950 Nm | 9.550 Nm | 13.400 Nm | 16.100 Nm | – | – | – |
| M60 | 90 | 7.400 Nm | 11.900 Nm | 16.700 Nm | 20.000 Nm | – | – | – |
| M64 | 95 | 8.950 Nm | 14.300 Nm | 20.100 Nm | 24.100 Nm | – | – | – |
| M68 | 100 | 10.800 Nm | 17.300 Nm | 24.300 Nm | 29.100 Nm | – | – | – |
Torque charts are essential tools for ensuring that fasteners are tightened to the correct specifications, preventing issues like fastener failure, leaks, or structural problems. They help maintain the safety and reliability of mechanical systems and structures.