What material steel is used for bolts of grade 8.8, grade 10.9, and grade 12.9？

What material steel is used for bolts of grade 8.8, grade 10.9, and grade 12.9?

Grades 8.8, 10.9, 12.9, and bolts are all made of high-strength steel.

8.8 grade bolts commonly use 35# steel or 45# steel; 10.9 grade bolts use 40Cr, 35CrMo, 42CrMo; 12.9 grade bolts use 35CrMo, 42CrMo. The material of high-strength bolts is 35# steel or other high-quality materials, which are heat-treated after being made to improve the strength. High-strength bolts can withstand larger loads than ordinary bolts of the same specification.

High-strength bolts related introduction:

High-strength bolts are made of high-strength steel and require a large pre-tightening force. It uses a special wrench to tighten the nut, so that the bolt generates a huge and controlled pre-tension force. , the same amount of pre-pressure is generated on the connected parts. Under the action of pre-pressure, a large friction force will be generated along the surface of the connected parts.

The high-strength bolt connection relies on the friction between the contact surfaces of the connectors to prevent them from sliding each other. In order to make the contact surfaces have sufficient friction, it is necessary to increase the clamping force of the components and increase the friction coefficient of the contact surfaces of the components. . The clamping force between the components is to apply pre-tension to the bolts, and the bolts must be made of high-strength steel.

Ming Xiao Mfg Custom Nonstandard bolts & steel turned parts with grade 8.8, grade 10.9, and grade 12.9.