Recommended Tightening Torque for LM Rails
With high-precision LM rails for the LM Guide, their raceways are ground and accuracy is inspected with the rails tightened with bolts. When mounting a high-precision LM rail on a machine, we recommend using the corresponding tightening torque indicated in Table1 or Table2
Table1 Tightening Torques when Pan Head Screws are Used
Unit: N･cm
| Screw model No. |
Tightening torque | |
|---|---|---|
| Not hardened | Hardened | |
| M 2 | 17.6 | 21.6 |
| M 2.3 | 29.4 | 35.3 |
| M 2.6 | 44.1 | 52.9 |
Table2 Tightening Torques when Hexagonal-Socket-Head Type
Bolts are Used
Bolts are Used
Unit: N･cm
| Screw model No. |
Tightening torque | ||
|---|---|---|---|
| Steel | Cast Iron | Aluminum | |
| M 2 | 58.8 | 39.2 | 29.4 |
| M 2.3 | 78.4 | 53.9 | 39.2 |
| M 2.6 | 118 | 78.4 | 58.8 |
| M 3 | 196 | 127 | 98 |
| M 4 | 412 | 274 | 206 |
| M 5 | 882 | 588 | 441 |
| M 6 | 1370 | 921 | 686 |
| M 8 | 3040 | 2010 | 1470 |
| M 10 | 6760 | 4510 | 3330 |
| M 12 | 11800 | 7840 | 5880 |
| M 14 | 15700 | 10500 | 7840 |
| M 16 | 19600 | 13100 | 9800 |
| M 20 | 38200 | 25500 | 19100 |
| M 22 | 51900 | 34800 | 26000 |
| M 24 | 65700 | 44100 | 32800 |
| M 30 | 130000 | 87200 | 65200 |
