Guidelines for coefficients of frictions - steel fasteners
|Standard finish of steel plated bolts|
|Surface condition||µ total for lubricated condition|
|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.