Fastener standard knowledge
1, the standard of the product size of fastener: specify the content of the basic dimensions of the product; the product with thread, fastener products: stainless steel screw, non standard screw, multi position screw, mechanical and electrical screw, and open screw.
2. Standard for technical conditions of fastener products. Specifically, it includes the following criteria:
A) standards for tolerances of fasteners: specify the dimensions and tolerances of products.
B) standard for mechanical properties of fastener products: specify the marking method of the mechanical performance grade of the product and the contents of mechanical performance items and requirements; some fastener products change this content into the content of the performance of the product material or work performance.
C) standards for surface defects of fastener products: specify the types and specific requirements of product surface defects.
D) standards for surface treatment of fasteners: specific requirements for product surface treatment and specific requirements.
E) standard for fastener product testing: specific requirements for the above performance requirements.
3. The standards for inspection, marking and packaging of fastener products: specifically stipulate the quality level and sampling plan for the inspection of the products when the products are checked and checked, and the contents of the product marking methods and packaging requirements.
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