Fastener standard:
1. Standards for fastener product size: specify the basic dimensions of the product; threaded products, including the basic dimensions of the thread, thread finish, shoulder distance, undercut and chamfer, end of externally threaded parts Size and other aspects.
2. Standards for technical conditions of fastener products. Specifically, it includes the following standards:
a) Standards for fastener product tolerances: specify tolerances and shape tolerances for product dimensions.
b) Standards for the mechanical properties of fastener products: the marking method of the mechanical performance grade of the product and the mechanical performance items and requirements; some fastener products change the content to the material properties or work performance. Aspect of the content.
c) Standards for surface defects of fastener products: specify the types of surface defects and specific requirements of the product.
d) Standards for surface treatment of fastener products: specify the types of surface treatment and specific requirements of the product.
e) Standards for the testing of fastener products: specify the test aspects of the above various performance requirements.
3, fastener product acceptance inspection, marking and packaging standards: specific provisions for product inspection and acceptance of the project qualified quality level and sampling plan, as well as product marking methods and packaging requirements.
4. Standards for marking methods for fastener products: specific provisions for the complete marking method of products and simplified marking methods.
5. Standards for other aspects of fasteners: standards such as fastener terminology, standards for fastener product weight, etc.
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