Five standards involved in fasteners

Each fastener product must involve some standards in several aspects:

1. 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 external thread The end size of the part and other aspects.

2. Standards for technical conditions of fastener products. Specifically, it includes the following standards:

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

2) Standards for mechanical performance of fastener products: specify the marking method of product mechanical performance levels and the content of mechanical performance items and requirements; some fastener products will change this content to product material performance Or work performance content. (Guide: Fasteners and screws are prone to bad phenomena)

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

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

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

3. Fastener product acceptance inspection, marking and packaging standards: specify the qualified quality level and sampling plan of the random inspection items during the factory acceptance of the product, as well as the content of the product marking method and packaging requirements.

4. Standards on the marking method of fastener products: specify the complete marking method of the product and the content of the simplified marking method.

5. Other standards of fasteners: such as the standard of fastener terminology, the standard of fastener product weight, etc.

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