What is an external hex nut?

The hexagonal nut is mainly used in conjunction with bolts and screws to connect fasteners. According to the nominal thickness, nuts are divided into three types: Type I, Type II, and Thin. Nuts with a grade of 8 or above are divided into two types: Type I and Type II. Type I nuts are further divided into three grades: A, B, and C.

Application scenarios
A-grade and B-grade nuts are suitable for machines, equipment, and structures with low surface roughness and high precision requirements, while C-grade nuts are used for machines, equipment, or structures with relatively rough surfaces and low precision requirements; The thickness of Type II hex nuts is relatively thick and is often used in situations where assembly and disassembly are required.