Five standard conditions for fastener products

Regarding fastener products, the following standard conditions must be met during production to ensure customers' utilization rate of fastener product quality. What are the standard conditions for fastener products? There are mainly the following five types.

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:

a) Standards for fastener product tolerances: specify product size tolerances and geometric tolerances.

b) 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. (Guide: Which points should be paid attention to when maintaining cylindrical head welding nails for fasteners?)

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

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

e) Fastener product testing standards: specify the test content 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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