This standard specifies the specified working conditions, models, basic parameters, requirements, test methods, inspection rules, marking, packaging and storage of unlubricated swing air compressors without prime movers. This standard applies to air compressors with a nominal volumetric flow rate of 4m3/min~13m3/min and a rated exhaust pressure not exceeding 0.3MPa. This standard also applies to air compressors with electric motors or internal combustion engines for the same purpose.