Round Nut Material: Plain, blackened, and galvanized nuts are usually made of ordinary carbon steel, and round nuts typically have a grade of performance. Stainless steel ones are generally A2-70. To differentiate between carbon steel nuts and stainless steel nuts, just use a magnet; stainless steel nuts won't be attracted to the magnet. Stainless steel products usually have a bright silver color. 1. Hex Nuts: Fixed on stationary workpieces, Round Nuts: Used to lock axles on moving workpieces. Fixed workpieces use hex nuts, and locking workpieces use round nuts. 2. Round Nuts are mainly used for securing the ends of shafts, usually used together with lock washers, typically have fine threads. The concept of nuts is quite broad, generally including standard hex head nuts, butterfly nuts.

The round nut is often paired with a locking washer. During assembly, insert the tongue of the washer into the slot of the shaft, and the outer tongue of the washer into the slot of the round nut, thereby securing the nut. It is commonly used for the axial fixing of roller bearings.