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Standard parts refer to the structure, size, drawing, marking and other aspects have been completely standardized, and commonly used zero (part) parts produced by professional factories, such as threaded parts, keys, pins, rolling bearings and so on. In a broad sense, it includes standardized fasteners, connectors, transmission parts, seals, hydraulic components, pneumatic components, bearings, springs and other mechanical parts.

The narrow definition includes only standardized fasteners. The domestic commonly known standard parts are short 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 automobile standard parts, mold standard parts, etc., which are also generalized standard parts.