Standard parts refer to commonly used components such as threaded parts, keys, pins, rolling bearings, etc. that have been fully standardized in terms of structure, size, drawing, marking, and other aspects and are produced by professional factories. Broadly speaking, it includes standardized mechanical components such as fasteners, connectors, transmission components, seals, hydraulic components, pneumatic components, bearings, springs, etc.

Narrowly, it only includes standardized fasteners. The commonly known standard component in China is the abbreviation for standard fasteners, which is a narrow concept, but the existence of a broad concept cannot be ruled out. In addition, there are industry standard parts, such as automotive standard parts, mold standard parts, etc., which also belong to the broad range of standard parts.