What material should be chosen for bolts and nuts?

The function of bolt and nut mechanical equipment is different. The difference depends on:

① The equipment function of the nut mainly depends on the strength of the nut, the relative height of the nut, and the thickness of the nut. Therefore, the standard of the material is not high. Naturally, if there is a requirement for the resistance of the nut, a higher-level material should also be used, such as a chemical plant. The standard nut has provisions for resistance to standardize the higher-end materials.

② For the overall plasticity target specified by the bolt, the higher the action level, the higher-level material can be reached. The lower-level material only needs to reduce the quenching ambient temperature to achieve the compressive strength requirements, but it cannot satisfy the plasticity, resistance In the inspection of standard parts, the brittle fracture is judged to be insufficient. The steel frame structural bolts are also standardized with higher compressive strength, in order to ensure the plastic resistance of the bolts.