Double End Threaded Bolt

Studs (studs), also known as double-headed screws or studs. Used to connect the machine to the fixed link function, both ends of the studs are threaded, the middle of the screw, there are thick and fine. Generally used in mining machinery, bridges, cars, motorcycles, boiler steel structure, hanging tower, large span steel structure and large buildings.

The main purpose

1, used in the main body for large equipment, need to install accessories, such as mirrors, mechanical seal seat, reducer and so on. Then use the double-headed bolts, one end screwed into the main body, the other end of the annex to install the nut, because the attachment is often removed, the thread will wear or damage, the use of double-headed bolt replacement will be very convenient.

2, for the connection body thickness is very large, the bolt length is very long, will use double-headed bolts.

3, for connecting the thick plate and inconvenience to use hex bolts to connect the place, such as concrete roof truss, roof beam suspension monorail beam hanging pieces.

Anti-loose purpose

In the actual work, the external load has the vibration, the change, the material creep at high temperature will cause the friction to reduce the thread middle pressure in a certain moment disappears, the friction force is zero, thus causes the thread connection loosely, as the repeated action, It will relax and fail. Therefore, must be anti-loose, otherwise it will affect the normal work, resulting in accidents.

Basic knowledge

The studs are made according to GB897-GB901 standard. The materials are: Q235, 45 #, 40Cr, 35CrMoA, Q345D, specifications are: M3mm-M100mm, the length can be customized according to user needs.

High strength double-headed bolts, materials are 35 #, 45 #, 35CrMoA, 25Cr2MoV, 304,316,304L, 316L, 2H, 2HM, B7, B7M, B16, B8,8, B8M, 8M, widely used in electric power, , Oil refining, valves, railways, bridges, steel, automobile and motorcycle accessories and other fields

The role of double-headed bolts: generally used in mining machinery, bridges, automobiles, motorcycles, boiler steel structure, hanging tower, large-span steel structure and large buildings.

(Standard) 35 # / 35 # (material) 8.8 / 8 (modulation level) means: diameter = 12mm length = 100mm GB 901-88 is the national standard (of course, can also be used as required industry standards)

Double head bolts Standard: GB 900-1988

Introduction to studs Double-headed bolts save time and cost All studs are constructed without the need for drilling, punching, threading, riveting, threading and finishing steps, expanding the potential for structural design, high current and Small penetration depth. Therefore, it can be welded to a very thin sheet. The workpiece of the stud welding must be welded from one side. Can be welded in full position, by means of an expander that can be restricted on a vertical partition. Because it is a short time welding and welding is rarely deformed, so do not need to dress. Because the welding structure does not require drilling, it will not cause leakage. The joint can achieve a high strength, that is, the strength of the stud welding joint is greater than the strength of the stud itself.

How to install a double-headed bolt A good economy for other welding methods has the advantage of welding power. For mass production of the workpiece, the standard stud is low cost. Equipment and welding torch with a variety of types, equipment purchase costs are relatively low. According to the product, can be made of multi-station automatic welding machine, or high-precision gantry CNC automatic welding machine. The stud welding has a higher quality reproduction rate and a smaller scrap rate. However, the stud welding in the application should pay attention to other melting welding, the steel in the carbon content of certain restrictions on the structural steel stud, according to the recommended stud material and base metal combination of solderable welding, otherwise the stud And the base material will be non-melting between each other. Recommended range of stud material and base metal combination to determine the weldability and anchor bolts through the design requirements of the relevant test to assess the possibility of assessment.