1, fastener Product size standards: Specify the basic dimensions of the product content; Threaded products, including the basic size of the thread, thread closure, shoulder distance, retract groove and chamfer, external thread parts, such as the end size of the content.
2, fastener product technical condition aspect standard. Mainly including product tolerances, mechanical properties, surface defects, surface treatment, product testing standards and the corresponding specific provisions of the content.
3, screw product acceptance inspection, marking and packaging standards: the specific provisions of the Product factory acceptance inspection project quality level and sampling plan, as well as product labeling methods and packaging requirements.
4, standard parts, fasteners, screws, screws marking method standards: Specify the product complete labeling method and simplified marking method content.
5, fasteners Other aspects of standards: such as fastener terminology standards, fasteners product weight standards.