Double-headed screws are generally used in mining machinery, Bridges, automobiles, motorcycles, boiler steel structures, hanging towers, long-span steel structures and large buildings.
1. The function of double-headed screws
Generally used in mining machinery, bridges, automobiles, motorcycles, boiler steel structures, hanging towers, long-span steel structures and large buildings, etc.
Double-headed screws are manufactured in accordance with GB897-901 standards. The materials used are: Q235, 45#, 40Cr, 35CrMoA, Q345D. The specifications are: M3mm-M100mm. The length can be customized according to user needs.
2. Material of double-headed screws
There are 35#, 45#, 35CrMoA, 25Cr2MoV, 304, 316, 304L, 316L, 2H, 2HM, B7, B7M, B16, B8, 8, B8M, 8M, which are widely used in electric power, chemical industry, oil refining, valves, railways, Bridges, steel structures, automobile and motorcycle accessories and other fields.
3. Representation method of double-headed screws
Generally, double-headed screws are expressed as: M12×100 GB/T901-88 (standard) 35#/35# (material) 8.8 level/8 (modulation level), which means: diameter = 12mm length = 100mm GB/T901-88 The national standard is adopted (of course, industry standards can also be adopted as needed)
1. Used when the main body is large-scale equipment that needs to install accessories, such as sight glasses, mechanical seal seats, reduction racks, etc. This is the double-headed screw used. One end is screwed into the main body. After the accessories are installed, a nut is attached to the other end. , since the accessories are often disassembled, the threads will be worn or damaged, so it is very convenient to replace them with double-headed screws.
2. When the thickness of the connecting body is very large and the length of the screw is very long, double-headed screws will be used.
