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Friction Co-Efficient for Zinc Plating ?

Can anybody provide the Co-Efficient of Friction value of Zinc plated seel surface ( Plain Washers) . The value is required for calculating the Tightening Torque of Bolts.

Thanks

M. Sureshkumar
Quality Engineer - Coimbatore, India
2007

A. I found 0.21 for pure zinc on zinc in an old ASM handbook, and 0.14-0.25 for galvanized hardware on the roymech.co.uk website. This system property is wildly variable, plus zinc is susceptible to stick-slip, so I would not rely on such values for any important calculation. A better approach may be to choose a proprietary lubricant and get from the manufacturers the typical values that should be associated with use of that lubricant.

Ted Mooney, P.E.
Striving to live Aloha
(Ted can offer longterm or instant help)
finishing.com - Pine Beach, New Jersey
2007

A. You should take look to VDI 2230-1, where it says that connection on zinc galvanised steel μ>0.3 if not lubricated and if lubricated, the drop to even µ<0.1

Przemyslaw Siedlaczek
BT - Chorzów,Silesia,Poland
August 5, 2016

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