Fasteners are needed after surface treatment, many kinds of fastener surface treatment, commonly used for electroplating, oxides, phosphorus, non-electrolytically applied zinc flake coating, etc. However, plated fasteners in the actual use of fasteners accounted for a large proportion. Especially in automobiles, tractors, household appliance, instrumentation, aerospace, telecommunications and other industries and is more widely used in the field. However, for threaded fasteners, use not only requires you to have a certain degree of corrosion resistance and also to ensure interchangeability of the thread here or you can call it spin. In order to meet the requirements of threaded fasteners used in the "preservation" and "swap" double performance, specifically the plating layer standard is necessary.

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