Double-head screws are cylindrical fasteners with threads at both ends. They are widely used in electric power, chemical industry, oil refining, valves, railways, bridges, steel structures, machinery and large buildings. A double-ended stud is generally used for the link between two steel pieces to be linked. One section is welded to the surface of the piece to be connected, and the other end passes through the through hole, then a washer is put on, and a nut is screwed on to make the two connected The pieces are connected as a whole.
Double-head screws generally need to undergo surface treatment. There are many types of wires on the surface of the bolts. Generally, electroplating, blackening, oxidation, phosphating, and non-electrolytic zinc flake coating are commonly used. However, electroplated fasteners occupies a large proportion in the actual use of fasteners. It is especially widely used in industries and fields such as automobiles, tractors, home appliances, instrumentation, aerospace, and communications. However, for threaded fasteners, not only a certain anti-corrosion ability is required in use, but also the interchangeability of threads must be guaranteed, which can also be referred to as screwability here. In order to simultaneously meet the dual use performance of "anti-corrosion" and "interchangeability" required by threaded fasteners in use, it is very necessary to formulate special plating standards.
How to install stud bolts
1. When the main body is a large-scale equipment and accessories need to be installed, first screw one end into the main body, and after installing the accessories, put a nut on the other end and tighten the nut to tighten. Since the accessories are often disassembled, the threads will be worn or damaged, and it is very convenient to use studs to replace them.
2. When the thickness of the connecting body is very large and the length of the bolt is very long, it is not suitable to use hexagonal head bolts, but stud bolts are more suitable for selection.
Stud bolts are used to connect the fixed link function of the machine. Both ends have threads, the middle is the screw, and there are thick and thin. The thick one is called the thick rod or type A, and the thin one is called the thin rod or B type. It is mainly used when the connected parts are too thick and do not use bolts or because of frequent disassembly and assembly, the stud bolts are usually screwed into the screw hole at one end and connected with a nut at the other end. The equal length stud bolts are equipped with nuts at both ends.