No passwords, No popups, No cost, No AI:
we earn from 'affiliate link' purchases, making the site possible

Sound technical content, curated with aloha by
Ted Mooney, P.E. RET
Pine Beach, NJ

finishing.com -- The Home Page of the Finishing Industry

  The authoritative public forum
  for Metal Finishing since 1989

-----

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
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

(No "dead threads" here! If this page isn't currently on the Hotline your Q, A, or Comment will restore it)

Q, A, or Comment on THIS thread -or- Start a NEW Thread

Disclaimer: It's not possible to fully diagnose a finishing problem or the hazards of an operation via these pages. All information presented is for general reference and does not represent a professional opinion nor the policy of an author's employer. The internet is largely anonymous & unvetted; some names may be fictitious and some recommendations might be harmful.

If you are seeking a product or service related to metal finishing, please check these Directories: