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Basic knowledge of hex nuts

The hex nut is used with the screw, bolt and screw to match the fastening mechanism. Among them, the type 1 six-purpose nut is the most widely used. The C-class nut is used for machines, equipment or structures with rough surface and low precision; Class A and B grade nuts are used for smooth surface and high precision. Machine, equipment or structure. The thickness of the type 2 hex nut is thicker, and it is often used in occasions where assembly and disassembly are often required. The thickness M of the hexagonal thin nut is thinner and is often used when the surface space of the connected member is limited.

Hex nuts are classified into I type, II type and thin type according to the nominal thickness. Nuts of class 8 or higher are divided into two types, type 1 and type II. The type I hex nut is the most widely used, and the type 1 nut is divided into three grades A, B, and C. The grade A and grade B nuts are suitable for machines, equipment, and structures with low surface roughness and high precision. Class C nuts are used on machines, equipment or structures where the surface is rough and the precision is not high. The thickness of the type 2 hex nuts is relatively thick and is often used in applications where assembly and disassembly are often required.

The 1 type nut refers to the ordinary hex nut with the nominal height of the nut m≥0.8D, and its type size should meet the requirements of GB/T6170; the height of the 2 type nut is higher than that of the 1 type nut, and the type size should conform to GB/ T6175. There are two purposes for adding a type 2 nut: one is to obtain a relatively inexpensive nut by increasing the height of the nut. Because the 8-level 1-type nut of D≤M16 does not need to be heat-treated, in the 8-stage nut, only the type 2 nut is used for the D>M16~39 specification. It is obvious that the type 1 nut without heat treatment can not reach the 9-stage nut. Mechanical performance requirements. Another purpose of the Type 2 nut is to obtain a 12-stage nut with better toughness. As the height of the nut increases, the guaranteed stress index can be achieved at a lower quenching and tempering hardness, thus increasing the toughness of the nut. According to the distance between the teeth: standard teeth, regular teeth, fine teeth, very fine teeth and anti-tooth. Classified by material: stainless steel hex nut and carbon steel hex nut, copper hex nut, iron hex nut. Classified by thickness: hexagonal thick nut and hexagonal thin nut. Classified by usage: hot-melt copper nut, hot-pressed copper nut, embedded copper nut and ultrasonic copper nut


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