Each fastener product must involve some standards in several aspects:

1) Standards on the technical conditions of plastic fastener products. Specifically, it includes the following standards:

     a) Tolerance standards for fasteners: specify product size tolerances and geometric tolerances.

     b) Fastener product mechanical performance standards: specify the marking method of product mechanical performance levels and the content of mechanical performance items and requirements; some fastener products change this content to product material performance or work performance Aspect content.

     c) Standards for fastener product surface defects: specify the types of product surface defects and specific requirements.

     d) Surface treatment standards of fastener products: specify product surface treatment types and specific requirements.

     e) Fastener product test standards: specify the test contents of the various performance requirements mentioned above.

2) Fastener product size standards: specify the content of the basic size of the product; products with threads also include the basic size of the thread, thread end, shoulder distance, undercut and chamfer, and the end of external threaded parts Dimensions and other aspects.