Hexagon nuts are classified into I, II, and thin types according to the nominal thickness. Nuts of level 8 or higher are classified 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 A, B, and C grades, in which the A and B nuts are suitable for machines, equipment, and structures with small surface roughness and high precision requirements. Grade C nuts are used on machines, equipment or structures where the surface is rough and the accuracy is not high. Type 2 hex nuts are thicker and are often used where mounting and dismounting are often required.
A type 1 nut refers to a common hexagonal nut with a nominal height of the nut of m ≥ 0.8D, and its type size shall conform to the provisions of GB/T 6170;
The height of the type 2 nut is higher than that of the type 1 nut, and its type size should conform to GB/T 6175. The purpose of adding a type 2 nut is twofold: First, by increasing the height of the nut, a relatively inexpensive nut that does not require heat treatment is obtained.
Because the 8-stage, 1-type nut with D ≤ M16 does not require heat treatment, it is only available in the 8-stage nut with the specification D > M16-39.
Obviously, the type 1 nut that does not require heat treatment cannot meet the mechanical performance requirements of the 9th nut. Provides tougher grade 12 nuts when specifying another purpose of the Type 2 nut. As the height of the nut increases, a guaranteed stress index can be achieved at a lower quenched and tempered hardness, thus increasing the toughness of the nut.
According to pitch distance classification: standard teeth, regular teeth, fine teeth, very fine teeth and reverse teeth.
Classified by material: stainless steel hex nut and carbon steel hex nut, copper hex nut, iron hex nut.
Classified by thickness: hexagonal thick nuts and hexagonal thin nuts.
Classified according to use method: hot-melt copper nut, hot-pressed copper nut, embedded copper nut and ultrasonic copper nut
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