How to deal with the surface of the bolt?

Update: 23-11-2020

Stud bolts generally need to undergo surface treatment. […]

Stud bolts generally need to undergo surface treatment. There are many types of bolt surface treatments. Generally, electroplating, blackening, oxidation, phosphating, and non-electrolytic zinc flake coating are commonly used. However, electroplated fasteners occupies a large proportion in the actual use of fasteners. It is especially widely used in industries and fields such as automobiles, tractors, home appliances, instrumentation, aerospace, and communications. However, for threaded fasteners, not only a certain anti-corrosion ability is required in use, but also the interchangeability of threads must be guaranteed, which can also be referred to as screwability here. In order to simultaneously meet the dual use performance of "anti-corrosion" and "interchangeability" required by threaded fasteners in use, it is very necessary to formulate special plating standards.
GB/T5267.1-2002 [Threaded fastener plating layer] standard is one of the national standards "Fastener surface treatment" series of standards, this standard includes: GB/T5267.1-2002 [Fastener plating layer]; GB/T5267.2-2002 [Non-electrolytic zinc flake coating for fasteners] Two standards. This standard is equivalent to adopting the international standard ISO4042; 1999 [Electroplating layer of threaded fasteners]. This standard replaces the GB/T5267-1985 [Plating layer of threaded fasteners] standard.

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