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VW coating specifications on wheel bolts

I received a request from a customer , he asked me a coating according standard VW 137 50, the coating code is c675, which kind of coating is it? The part to be coated is a wheel bolt.

Thanks

Simone Lievore
Bimecc - Veggiano, Padova, Italy
2004

Your customer should have provided a copy of VW 137 50 to you if you are supposed to certify that the parts will meet the specified requirements. First, there is no category c675. The code letter c means electrolytically zinc plated. Also, the requirements for the plating are specified in another VW standard such as TL 217. You really should review the documents before proceeding any further.

Toby Padfield
Automotive module supplier - Michigan
2004

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