Fasteners fasteners, also known as standard parts in the market, are a general term for a class of mechanical parts used to fasten and connect two or more parts (or components) into a whole. It is characterized by a wide variety of specifications, different performance and uses, and a high degree of standardization, serialization and generalization. Fasteners are the most widely used mechanical basic parts, which are in great demand. As the name suggests, non-standard fasteners are non-standard fasteners. In other words, they are specially customized fasteners according to user needs.