Guidlines for Coefficients of Frictions - Steel Plated 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

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.