Guidelines for coefficients of frictions - steel fasteners
| Standard finish of steel plated bolts | |||
|---|---|---|---|
| Surface condition | µ total for lubricated condition | ||
| Screw | Nut | Oiled | MoS2 paste |
| No subsequent treatment phosphated | No subsequent treatment | 0.12 - 0.18i | 0.05 - 0.1 |
| Electroplated approx 8U | No subsequent treatment (electroplated 5U) | 0.12 - 0.19i | - |
| Dacromet coated 6-8u | No subsequent treatment (electroplated 6-8U) | 0.10 - 0.14 | - |
i For tightening with impact or mechanical screw driver µ total must be 0.125.