Weide Auto Parts Co., Ltd. (hereinafter referred to as the Company) was founded in 1983 with a registered capital of 50 million yuan, specializing in the research, development, production and sales of high-strength standard and non-standard fasteners. After more than 30 years of pioneering work, the company has won many honorary titles such as "high-tech enterprise", "AAA level contract abiding and credit worthy unit", "provincial science and technology based small and medium-sized enterprise", and has successively passed IATF16949 automobile industry quality management system certification, ISO14001 environmental management system certification and GB/T45001 occupational health and safety management system certification.
Specializing in fastener research and development for 30 years
It has dozens of national patents
More than 30 years of fastener R&D experience
Introduction to bolt strength classes
Strength grades are classified according to mechanical properties. According to the relevant standards, the bolt performance grade is divided into 3.6, 4.6, 4.8, 5.6, 6.8, 8.8, 9.8, 10.9, 12.9 and more than 10 grades, of which 8.8 and above bolts made of low-carbon alloy steel or medium carbon steel and heat treatment (quenching, tempering), commonly known as high-strength bolts, the rest are commonly known as ordinary bolts. The bolt performance grade number has two parts consisting of numbers, which indicate the nominal tensile strength value of the bolt material and the flexural strength ratio. For example.