What is studs?why choose it

Basic introduction

Stud, also called double end screw or double end stud. The function used to connect the machine . The stud bolt has threads at both ends, the middle is rod with thick or thin. Generally used in mining machinery, bridges, automobiles, motorcycles, boiler steel structures, crane towers, large steel structures and large buildings, etc.

Bolts specifically refer to screws with larger diameters, and they can also have no heads, such as stud bolts. Generally, it is not called a "stud bolt" but a "double stud bolt". The most commonly used form of double-end studs has threads on both ends and a polished rod in the middle.

The most typical use: anchor bolts, or places similar to anchor bolts, when thicker connections cannot be achieved with ordinary bolts.

Specification label


stud bolts with thread specification d=M12, nominal length L=80mm, and performance class 4.8 is: GB 901 M12×80.

Application


1. It is used in the main body of large equipment, which needs to be installed with accessories, such as sight glasses, mechanical seal seat, reduction frame, etc. At this time, stud bolts are used, one end is screwed into the main body, and the other end is fitted with a nut after the attachment is installed. Since the attachment is often removed, the thread will be worn or damaged. It is very convenient to use the stud replacement.

2. When the thickness of the connecting body is very large, and the length of the bolt is very long, stud bolts will be used.

3. It is used to connect thick plates and places where it is inconvenient to use hexagonal bolts, such as concrete roof truss, roof beam suspension monorail beam suspension, etc.

Anti-loosening purpose
In actual work, external loads such as vibration, change, and high-temperature creep of the material will reduce the friction. The positive pressure in the thread pair disappears at a certain moment, and the friction force is zero, which will loosen the threaded connection. If repeated action, the threaded connection It will relax and fail. Therefore, it is necessary to prevent loosening, otherwise it will affect normal work and cause accidents.

Surface treatment

Stud bolts generally need to undergo surface treatment. There are many types of bolt surface treatments. 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. Especially in industries and fields such as automobiles, tractors, home appliances, instrumentation, aerospace, communications, etc., it is more widely used.

However, for threaded fasteners, not only a certain anti-corrosion ability is required in use, but also the interchangeability of threads must be ensured, 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.

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