2h heavy hex nuts are classified into I type, II type and thin type according to their nominal thickness. Nuts above grade 8 are divided into two types: Type 1 and Type II. Type I hexagonal nuts are the most widely used. Type 1 nuts are divided into three levels: A, B, and C. Among them, A and B nuts are suitable for machines, equipment and structures with small surface roughness and high precision requirements. Grade C nuts are used for machines, equipment or structures with rough surfaces and low precision requirements; Type 2 hexagon nuts have a thicker thickness, and are often used in occasions that often require assembly and disassembly.

There are two purposes for adding type 2 nuts: one is to obtain a relatively inexpensive nut that does not require heat treatment by increasing the height of the nut. Because D≤M16 type 8 type 1 nuts do not need heat treatment, among the type 8 nuts, only the specifications of D>M16~39 can use type 2 nuts. Obviously, type 1 nuts that do not require heat treatment cannot reach the level of 9 nuts Mechanical performance requirements. Another purpose of specifying the type 2 nut is to obtain a grade 12 nut with better toughness.

There are two levels of 2h heavy hex nuts, one is 4.8, ordinary nuts, and the other is 8 nuts. For more industry knowledge about nuts, please read the nut specification table and the national standard specification table of the nut industry. These nut specification sheets and industry standard knowledge. Let us have a deeper understanding of nuts.