Stainless Steel Fasteners: Recommended Tightening Torques.
The following data tables are designed to be used as general guidance when installing Stainless Steel fasteners.
| Unrated Stainless Steel Fasteners | |
|---|---|
| Size of Fastener | Recommended Maximum Tightening Torque (Nm) |
| M2 | 0.4 |
| M2.5 | 0.65 |
| M3 | 1 |
| M4 | 2.5 |
| M5 | 5 |
| M6 | 8.5 |
| M8 | 20 |
| M10 | 40 |
| M12 | 70 |
| M14 | 115 |
| M16 | 180 |
| M18 | 250 |
| M20 | 365 |
| Rated Stainless Steel Fasteners (A2-70, A4-70) | |
|---|---|
| Size of Fastener | Recommended Maximum Tightening Torque (Nm) |
| M2 | 0.4 |
| M2.5 | 0.75 |
| M3 | 1.35 |
| M4 | 3 |
| M5 | 6.1 |
| M6 | 10 |
| M8 | 25 |
| M10 | 50 |
| M12 | 88 |
| M14 | 140 |
| M16 | 215 |
| M18 | 380 |
| M20 | 435 |
| Rated Stainless Steel Fasteners (A2-80, A4-80) | |
|---|---|
| Size of Fastener | Recommended Maximum Tightening Torque (Nm) |
| M2 | 0.55 |
| M2.5 | 0.8 |
| M3 | 1.85 |
| M4 | 4 |
| M5 | 8 |
| M6 | 13.5 |
| M8 | 32 |
| M10 | 69 |
| M12 | 117 |
| M14 | 185 |
| M16 | 290 |
| M18 | 410 |
| M20 | 585 |
Please note: The above data is based on a dry installation and should not be used for a lubricated installation. This data is based on a Metric Coarse Thread. The values stated are taken from a controlled environment and are not specific to a particular screw type - different fasteners may have different attributes which can affect the values given within this table. Accu cannot guarantee the figures given and they should be used as a guide only.