The GB31.1-2013 standard specifies hexagonal head screw bolts with holes with thread sizes of M6~M48 and product grades of A and B. The standard also specifies the use of cotter pin holes in the shank of GB/T 5782 products. These bolts have cotter pin holes in the rod of GB/T 5782 products, which are used in occasions where anti-loosening or specific installation requirements are required.
Material: including carbon steel, alloy steel, stainless steel (such as 304, 316, 316L, etc.) and other materials, the specific selection depends on the working environment and application requirements.
Grade: The product grade is divided into A grade and B grade, as well as different mechanical properties grade (such as 4.8 grade, 8.8 grade, A2-70, etc.), these grades reflect the tensile strength, yield strength and other mechanical properties of the bolt. Different grades are suitable for different load bearing requirements and working environments.
Bentley has industry-leading stainless steel resource integration capabilities, and rich raw material reserves, to ensure that thousands of leading position in the stainless steel wire processing industry. The combination of production, university and research, upstream and downstream linkage, and the special research and development of high-standard specific materials ensure the need for thousands of professional materials.
Standardised design for easy procurement and replacement.
Hole design allows for easy installation of cotter pins and other anti-loosening components, improving the reliability and safety of the connection.
A wide range of materials and grades are available to meet different application requirements.
Scope of
application
GB31.1 Hexagon head screw bolts with holes are widely used in machinery, automotive, aerospace, construction and other fields, especially where high reliability connections and anti-loosening designs are required.
Quality
Certification
Hebei Bentley is ISO9001:2015 certified and equipped with relevant certificates for quality assurance. Due to its specific dimensions and performance levels, it is suitable for a wide range of industrial and commercial scenarios including, but not limited to: machine building, construction work, transport, energy industry, timber frame connections.
inspection
Bentley has invested a huge amount of money to builda product testing laboratory, equipped with importedhigh-end instruments:such as thread comprehensivescanners, high temperature tensile testing machines,high frequency fatigue testing machines, etc., to ensurethat all products are strictly tested before leaving thewarehouse to ensure the reliability of customers duringuse.
