Nuts are an integral part of all manufacturing machinery.There are many kinds of nuts, we commonly have gb, British standard, American standard, Japanese standard nuts.

Introduction to Basic Knowledge

A nut is a nut, a part screwed together with a bolt or screw for fastening purposes, a component of any manufacturing machine.There are many kinds of nuts, we commonly have gb, German, British, American standard, Japanese standard nuts.

According to the different materials, nuts are divided into carbon steel, high strength, stainless steel, plastic steel and other types.According to the product attributes corresponding to different countries of the standard number can be divided into ordinary, non-standard, (old) gb, new GB, US system, British system, German standard.Different sizes, threads are divided into different specifications.In general, gb and GB are denoted by M (e.g., M8, M16), while in American and British systems, the specification is denoted by fractions or # (e.g., 8#, 10#, 1/4, 3/8).

Nuts are the parts that hold mechanical equipment together tightly by means of internal threads, nuts and screws of the same specification, such as the M4-0.7 nut can only be with M4-0.Screw assembly of 7 (in the nut, M4 refers to the nut diameter of approximately 4mm, 0.7 means the distance between two threads is 0.7 mm);The same goes for American products, for example, 1/4 to 20 nuts can only be matched with 1/4 to 20 bolts (1/4 finger nut diameter is approximately 0.25 inches, 20 means 20 teeth per inch).

classification

Stainless steel

Self-locking nut, locknut, locknut, four-jaw nut, screwdriver safety nut, nut for self-locking hexagon cap nut, nut for self-locking hexagon cap nut, nut for hexagon crown, ring nut.

Hexagon flange face locking nut with fine teeth all metal, hexagon flange face locking nut with fine tooth, non-metallic insert, hexagon flange face locking nut with fine tooth

Round nut slotted round nut slotted round nut slotted round nut slotted round nut slotted round nut slotted round nut slotted round nut slotted round nut slotted round nut slotted round nut slotted round nut slotted round nut slotted round nut slotted round nut slotted round nut slotted circular nut butterfly nut copper-nut slotted copper-nut scalloped copper-nut scalloped copper-nut scalloped copper-nut slotted copper-nut injection copper-nut etc.

alloy

Zinc copper alloy nuts and so on.

Hexagon nuts are divided into three types according to the nominal thickness: Type I, type II and thin.There are two types of nuts above class 8: Type I and type II.

Type I hexagon nut is the most widely used, type I nut is divided into A, B, C three levels, where class A and Class B nuts are suitable for the surface roughness is small, high precision requirements of the machine, equipment and structure, while class C nuts are used for the surface roughness, low precision requirements of the machine, equipment or structure;The thickness of type II hexagon nut is relatively thick, and it is commonly used in the occasions that often need to be assembled and disassembled.

Common national standards for nuts:

Type GB41 Ⅰ hexagonal nut, class C

Type GB6170 Ⅰ hexagonal nut, grade A and B

Type GB6171 Ⅰ hexagonal nut, fine teeth, A and B

GB6172 thin hexagon nuts - Class A, B - Chamfered

GB6173 Thin hexagon nuts - fine teeth - Class A, B

GB6174 Thin hexagon nuts - Class B - chamfered

Type GB6175 Ⅱ hexagonal nut, grade A and B

Type GB6176 Ⅱ hexagonal nut, fine thread - A and B

Hex flange face nuts - Class A

GB55 Thick hexagon nut

GB56 Hexagonal super thick nut

GB1229 Large hexagon nuts (high strength for steel structure)

Class of metric bolts :4.6;4.8;5.8;6.8;8.8;9.8;10.9;12.9.

The metric nut classes are :4;5;6;8;10;Four of them;5 is the strength class of thin nuts.

Nut A;B;Grade C is equivalent to the Us G2;G5;G8 performance ratings, J995 between the two performance ratings are basically the same!

The thread specification of type I nuts is M1.6~M64, and the performance class is 6.8;10;A2-50;A2-70;A4-50;A4-70;CU2;CU3 and AL4, grade A and B, Grade A for M16 or less;Class B for specifications larger than M16!(A here;B refers to the accuracy level);

Type II nut thread specification is M5~M36, performance grade is 9 and 12, product grade is A and B, Grade A is used for specification less than or equal to M16;Class B for specifications larger than M16!(A here;B refers to the accuracy level);

Due to type 2 class of performance requirements is very high, so the thickness of the nut thicker bolt performance are rated 3.6, 4.6, 4.8, 5.6, 6.8, 8.8, 9.8, 10.9, 12.9, and so on more than 10 levels, including a magnitude of 8.8 and above bolt material is low carbon alloy steel and medium carbon steel and the heat treatment (quenching and tempering), known as high strength bolts, the rest of the known as ordinary bolts