Stainless steel expansion bolts have various specifications, including different grades such as 45, 50, 60, 70, 80, and different materials such as austenite A1, A2, A4 and martensite, ferrite C1, C2, C4. Its specification is expressed as A2-70, where the "--" before and after represent the material and strength grade of the bolt respectively. When choosing, it is necessary to select the appropriate expansion screw according to the actual situation of the wall. Common specifications include 6×60, 6×80, 6×120 and 6×150.
The 6×60 stainless steel expansion bolt has a total length of 60 mm, a sleeve length of 45 mm, a diameter of 8 mm, a wall thickness of 0.7 mm, and a surface treated with colored zinc. The screw is 60 mm long, 6 mm in diameter, and the threaded part is 35 mm long. The bottom hammer is 8 mm conical and also treated with colored zinc. The nut is octagonal, with an outer diameter of 10 mm, a thickness of 5 mm, and a surface treated with white zinc. The gasket has an outer diameter of 13 mm, a thickness of 1 mm, an inner diameter of 6 mm, and a surface treated with white zinc. The spring is annular, with an outer diameter of 9 mm, an inner diameter of 6 mm, and a thickness of 1.6 mm.
Similarly, the 6×80, 6×120, and 6×150 stainless steel expansion bolts are different in size and material, but the size and material of their screws, nuts, washers, and springs are consistent. These specifications of stainless steel expansion bolts are widely used in various wall fixing occasions.