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Author: Site Editor Publish Time: 2023-03-13 Origin: Site
What types of screws are called set screws? Are there any classifications? What is the usage of set screws? What are the standards for tightening set screws? Let's take a look
The following is the content introduction
What is a set screw?
Purpose of set screw
Performance grade of set screw
There are also set screws, man-machine meter screws, head screws, positioning screws, stop screws, etc. It is a kind of screw used to fix the relative position of mechanical parts. It is classified according to the groove type. It can have hexagonal set screw, Torx set screw, slotted set screw, and square head set screw without groove type. The optional materials include stainless steel, iron, brass, aluminum, titanium, etc.
The set screw is also divided into flat end set screw, concave end set screw, and cone end set screw. How to use the set screw? When using the set screw, first screw the screw into the internal thread hole of the part to be fixed, and then press the end of the screw tightly on the surface of another part (or in the corresponding bit on the surface), even if the relative position of the two parts is fixed. The use scenarios of the flat end, concave end, and conical end are different, and the corresponding purposes are also different. Slotted, Torx, and hexagon socket set screws are not suitable for occasions where the screw head is allowed to be exposed, while square head set screws without slot type are suitable for occasions where the screw head is allowed to be exposed.
There are special performance grade evaluation criteria for set screws. The performance grade of set screws is expressed by hardness rather than the tensile strength mentioned above. The details are as follows: set screws made of carbon steel or alloy steel are divided into four performance grades, namely 14h, 22h, 33H, and 45h. The marking code of performance grade is composed of a number and letter H, in which the number part represents 1 / 10 of the minimum Vickers hardness and the letter H represents the hardness. For example, "14" of 14h indicates 1 / 10 of the lowest Vickers hardness, that is, the lowest Vickers hardness is 14x10 = 140hv.
The set screw made of stainless steel is only made of stainless steel, which is divided into 5 groups like stainless steel bolts, namely A1, A2, A3, A4, and as, and its chemical composition is also the same as that of stainless-steel bolts. The performance grade of stainless-steel set screw is divided into two performance grades, namely 12h and 21h. For the soft set screw, the hardness is low, and the minimum hardness is 125hv, represented by 12h; The set screw processed by cold deformation has high hardness, and the minimum hardness is 210hv, represented by 21h.
Ningbo yi pian hong Fastener Co., Ltd. was established in 2001, specializing in the production of all kinds of high-strength bolts, nuts, and threaded rods, with an annual production capacity of 30000 tons and an annual turnover of 300 million yuan. Products include ANSI / ASTM, DIN, BS, ISO, GB, JS, and other standards, which are mainly used in the field of high-strength seals and oil pipeline valves.
