Plain, blackened, galvanized ones are usually carbon steel pipes with slotted round nuts. The slotted round nuts typically have performance grades. Stainless steel ones are usually A2-70. To distinguish between slotted round nuts for carbon steel pipes and stainless steel pipes, just give them a magnetic test; the stainless steel ones won't be attracted by a magnet. Stainless steel products usually have a bright silver color.

Functional Graphical Hex Nuts, also known as nuts, are components that are tightened with bolts or rods to provide fastening, an essential part for all manufacturing machinery. They are categorized into several types based on material, such as carbon steel, stainless steel, and non-ferrous metals (like copper). According to properties, they adhere to standards like GB (Chinese National Standard), DIN (German Standard), ISO (International Standard), JIS (Japanese Standard), and ASTM/ANSI (American Standard).