What is the national standard number of common nuts?

National standard number of common nuts:

Hexagon nut GB 41Ⅰ-Grade C

Hexagon nuts GB 6170 Ⅰ-Grade A and Grade B

Gb 6171I hexagon nut-fine tooth-grade a and grade b.

Grade A and B Chamfering of GB6 172 Hexagon Thin Nut

GB6 173 Hexagon Thin Nut with Fine Teeth Grade A and Grade B..

GB6 174 Hexagon Thin Nut-Class B-No Chamfering

Grade A and B of GB 6175 Ⅱ hexagon nuts

GB 6176 Ⅱ hexagon nut has fine teeth of Grade A and Grade B..

GB6 177 Hexagonal hexagon nuts with flange Grade A

GB55 hexagon thick nuts

GB56 hexagon extra-thick nut

GB 1229 hexagon nut (high strength for steel structure)

The nuts of GB, British, American and Japanese standards are commonly used as extension materials. Nuts are divided into carbon steel, high strength, stainless steel and plastic steel according to different materials. According to different product attributes, national standard numbers are divided into ordinary, non-standard, (old) national standard, new national standard, American system, English system and German system. Different sizes, threads regardless of specifications. General national and German standards are represented by m (such as M8, M 16), and American and British systems are represented by fractional or # fasteners with specifications (such as 8#, 10#, 1/4, 3/8). Nuts are parts that are closely connected with mechanical equipment, and nuts with the same specifications pass through internal threads. Nut 7 can only be used with M4-0.

7 (In the nut, M4 means that the inner diameter of the nut is about 4mm, 0. 7 indicates that the distance between two thread teeth is 0. 7mm)； So are American products. For example, the nut of 1/4-20 can only be matched with the screw of 1/4-20 (1/4 means that the inner diameter of the nut is about 0. 25 inches, 20 means 20 teeth per inch).

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