What are the correct standards for studs?
In addition to the distinction between metric and American double studs, the production is in accordance with GB/T901, GB/T897, GB/T898, GB/T899, GB/T900 standards. This includes Type A and Type B, The distinction between isometric threads and unequal length threads. Type A refers to the toothless portion of the screw and the general diameter of the thread. Type B means that the diameter of the toothless stem is slightly smaller than the diameter of the thread. Shaped products require the user to provide design paper.
Use of double-head screws:
Can be used for mechanical steel equipment, bridge installation, steel structure facilities, automobile and motorcycles, etc. The 12.9 high-strength double-head screws made of alloy steel are mostly used for pressure vessels, and the stainless steel studs are widely used in flanges and valves.
Main purpose analysis of stud bolts:
1, used in the main body for large equipment, need to install accessories, mechanical seal seat, reduction frame and so on. At this time, the double-headed screw is used, one end is screwed into the main body, and the other end is equipped with a nut. Since the attachment is frequently disassembled, the thread may be worn or damaged, and it is very convenient to replace the stud bolt.
2. For the thickness of the connecting body, when the bolt length is very long, the stud bolt will be used.
3, used to connect thick plates and inconvenient to use hexagonal bolts to connect, such as concrete roof trusses, roof beam suspension monorail beam suspension parts.
Introduction and safety of steel structural bolts