Dome Nut Nominal height
Hex nuts are classified into type I, type II and thin according to nominal thickness. 8 or more nuts are divided into type 1 and type II.
Type I nuts are the most widely used, and Type 1 nuts are divided into A, B and C grades. Class A and Class B nuts are suitable for machines, equipment and structures with high surface roughness and high precision. C-class nut is used for rough surface, the accuracy of the requirements of the machine is not high, equipment or structure; 2 hexagonal nut thickness is thick, more often used in the occasion of the need for assembly and disassembly.
1 type nut refers to the nominal height of the nut m ≥ 0.8D ordinary hex nut, the type size should be consistent with the provisions of GB / T6170;
The type 2 nut height than the type 1 nut to be high, the type size should be consistent with GB / T6175. The purpose of adding type 2 nuts is two: First, by increasing the height of the nut to get a heat-free, relatively low nut.
Because D ≤ M16 8 grade 1 nuts do not need heat treatment, so in the 8 nuts, only D> M16 ~ 39 specifications only with 2 nuts,
It is clear that the heat treatment of type 1 nuts does not meet the mechanical performance requirements of grade 9 nuts. When the other purpose of the type 2 nut is specified, a better grade 12 nut is obtained. As the height of the nut increases, the lower the quenching and tempering hardness can be achieved to ensure that the stress index, it increases the toughness of the nut.
Classification of teeth: standard teeth, regular teeth, fine teeth, very fine teeth and anti-teeth.
Material Category: Stainless steel Hex nuts and carbon steel Hex nuts, Hexagon nuts, Hexagon nuts.
According to the thickness of classification: hexagonal thick nut and hexagonal thin nut.
According to the use of classification: hot melt copper nut, hot copper nut, embedded copper nut and ultrasonic copper nut
Nut standard code:
As a standard parts, it should have its own general specifications for hex nuts, commonly used standards are: GB (commonly used on behalf of GB / T52-76 hexagonal nuts); German standard (commonly used with table DIN934-87 hex nuts) (Commonly used on behalf of ASME / ANSIB18.2.2), the international standard (commonly used on behalf of ISO4032) followed by less commonly used or special use (Australian standard, logo, Steam standard, chemical standard, power standard) and so on;
1, the general hexagonal - the application is more extensive, characterized by fastening force is relatively large, the disadvantage is that the installation should have sufficient operating space, the installation can use a live wrench, wrench or wrench wrench, wrench need to be large The operating space.