Guidlines for Coefficients of Frictions

Standard finish of steel plated bolts
Surface Conditionu total for lubricated condition
ScrewNutOiledMoS2 Paste
No subsequent treatment PhosphatedNo subsequent treatment0.12 - 0.18i0.05 - 0.1
Electroplated approx 8UNo subsequent treatment (Electroplated 5U)0.12 - 0.19i-
Dacromet Coated 6-8uNo subsequent treatment (Electroplated 6-8U)0.10 - 0.14-

i For tightening with impact or mechanical screw driver u total must be 0.125

Coeffiecients of friction u total of stainless steel screws (VDI 2230)
u total for lubricated condition
ScrewNutOiledMoS2 Paste
A2 to A4A2 to A50.23 - 0.500.10 - 0.20
A2 to A4AIMgSi0.28 - 0.350.08 - 0.16

Note: Due to the fact that fastening applications differ greatly, the above information is for guidance only and is correct to the best of our knowledge. The customer must satisfy themselves with the performance of the fastener and validity of the data. TR Fastenings will not be held responsible for any failure that may occur from the use of this information.