1. Standards for fastener product dimensions: specify the content of basic product dimensions; Products with threads also include basic dimensions of threads, thread finishing, shoulder distance, undercut and chamfer, and end dimensions of externally threaded parts.
2. Standards for technical conditions of fastener products. This mainly includes standards for product tolerances, mechanical properties, surface defects, surface treatment, product testing, and corresponding specific regulations.
3. The standards for screw product acceptance inspection, marking, and packaging: specify the quality level and sampling plan of the spot check items during product factory acceptance, as well as the content of product marking methods and packaging requirements.
4. Standard marking methods for standard parts, fasteners, screws, and screws: specify the complete marking methods and simplified marking methods for the product.
5. Other standards for fasteners, such as standards for fastener terminology, standards for fastener product weight, etc.