GB—The national standard is one of many standards in China. There are also industry standards, professional standards and departmental standards. National standards are divided into: GB (mandatory standards) and GB/T (re...
Each fastener product involves several criteria for several aspects: 1) Standards for the dimensions of fastener products: specify the basic dimensions of the product; threaded products, including the basic dimensions of...
Hydrogen embrittlement risk: 1. Under normal circumstances, products with hardness >32HRC have the risk of hydrogen embrittlement. Therefore, all products with a grade above 10.9 (including grade 10.9) and products th...
The heat treatment is mainly for carbon steel screws, mainly for quenching and tempering heat treatment and carburizing heat treatment to meet the screw strength requirements of different environments. 1. Quenching and t...
Functional aspects: 1. Screw Torque Requirements: The torsion force of the hexagonal screw is relatively larger, the torque of the hexagon socket screw is smaller, and the torque of the cross recess is smaller (so the sc...
An assembly is a type of fastener that is supplied in combination, such as a certain type of machine screw (or bolt, self-supplied screw) and a flat washer (or spring washer, lock washer); the connecting pair refers to a...
