Stainless steel extended expansion bolt

Expansion bolts are special threaded connectors used to fix pipe supports/hangers/brackets or equipment on walls, floors, and columns. Expansion bolts are composed of countersunk bolts, expansion tubes, flat washers, spring washers, and hexagonal nuts. Expansion bolt materials Stainless steel expansion bolts are divided into grades of 45, 50, 60, 70, and 80; The materials are mainly divided into austenite A1, A2, and A4; stainless steel 201, stainless steel 304, stainless steel 316, etc. Martensite and ferrite C1, C2, and C4; its representation method is, for example, A2-70; The "--" before and after respectively represent the bolt material and strength grade. (1) Bolt materials Commonly used materials: Q215, Q235, 25, and 45 steels. For important or special-purpose threaded connectors, alloy steels with higher mechanical properties such as 15Cr, 20Cr, 40Cr, 15MnVB, and 30CrMrSi can be selected. (2) Allowable stress The allowable stress of threaded connections is related to factors suc…