Nowadays, many users on the Internet are very concerned about the national standards of fasteners. We have made some conclusions on the national standards of modern fasteners for the attention of users. Let's take a look together.
1. The standard of fastener product size: specify the content of the basic size of the product; for the threaded product, it also includes the basic size of the thread, the end of the thread, the shoulder distance, the undercut and chamfer, and the end of the external thread part Dimensions and other aspects.
2. Standards on technical conditions of fastener products. Mainly include product tolerances, mechanical properties, surface defects, surface treatment, product testing standards and the corresponding specific content.
3. Standards for screw product acceptance inspection, marking and packaging: 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.
