This standard specifies the requirements for general air-cooled single-acting direct-connected portable reciprocating piston air compressors, including model and basic parameters, test methods, inspection rules, etc. It is applicable to air compressors driven by single-phase motors with input Power of 0.25 kW to 3.0 kW, with a rated Rotation speed greater than or equal to 1 300 r/min and a rated exhaust pressure not exceeding 1.0 MPa. Three-phase motor-driven air compressors and internal combustion engine-driven air compressors can also be referred to for implementation. The standard refers to a number of relevant documents to ensure the accuracy and conformity of the standard implementation.