Five standard conditions for fastener products

As for fastener products, the following standard conditions must be met during production to ensure the customer's utilization of fastener product quality. What are the standard conditions for fastener products? There are five main types.

1, fastener product size standards: specify the basic size of the product content; The product with thread also includes the basic size of thread, thread finish, shoulder distance, retracting slot and chamfer, end size of external thread parts and other aspects.

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

a) Fastener product tolerance standards: specify the product size tolerance and shape and position tolerance.

b) Standards for the mechanical properties of fastener products: specify the marking method of the mechanical properties grade of products and the contents of the mechanical properties items and requirements; Some fastener products will change this content to product material performance or work performance.

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

d) Standards for surface treatment of fastener products: specify the types and specific requirements of surface treatment of products.

e) Standards for product testing of fasteners: specify the test contents of the above performance requirements.

3. Standards for acceptance inspection, marking and packaging of fasteners: specifically specify the qualified quality level and sampling scheme of random inspection items, as well as the contents of product marking methods and packaging requirements during the acceptance inspection of products.

4. Standard of fastener product marking method: specify the content of complete product marking method and simplified marking method.

5, other aspects of fastener standards: such as fastener terminology standards, fastener product weight standards, etc.