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 I 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 accuracy is not high.
Type II hex nuts are thicker and are often used where assembly and disassembly are often required.
The I-shaped 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 type II nut is higher than that of the type 1 nut, and the size of the type should conform to GB/T6175. There are two purposes for adding a type II nut: one is to obtain a relatively inexpensive nut by increasing the height of the nut.
Because the 8-level I-shaped nut of D≤M16 does not need heat treatment, in the 8-level nut, only the type 2 nut is used for the specification of D>M16~39.
Obviously, the I-nut without heat treatment can not meet the mechanical performance requirements of the 9-stage nut. Another purpose of the Type II 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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