Several aspects of the standard content of fastener products

Fasteners are mainly used to connect and fasten parts and components, and they are also called standard parts. It mainly includes: screws, nuts, bolts, screws, etc. And each kind of fastener product must involve some standards of several aspects, mainly including the following standard contents.

1. Standards for fastener product size: specify the content of the basic size of the product; products with thread, also include the basic size of the thread, thread end, shoulder distance, undercut and chamfer, and external thread Aspects such as the end size of the part.

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

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

b) Standards on 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: Knowledge of Fasteners: Points to Note in Preventing Connecting Rod Bolts from Breaking)

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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