Hex socket nuts play a significant role in the real world, primarily used in conjunction with bolts to securely connect and fasten machinery or structures. Standard external hex nuts are widely used, characterized by their high clamping force, but they require ample operating space for installation, which can be achieved using adjustable wrenches, open-end wrenches, or crescent wrenches—any of which demand considerable space. The 2-type hex socket nuts have a thicker thickness M and are often used in situations that require frequent assembly and disassembly. Hex thin nuts have a thinner thickness M and are commonly used when the connected parts have limited surface space. Hex socket nuts, when used with bolts and screws, serve to connect and securely fasten components. The 1-type hex nuts are widely applied, with Grade C nuts used on machines, equipment, or structures with rough surfaces and low precision requirements; Grade A and B nuts are used on machines, equipment, or structures with smooth surfaces and high precision requirements.