Research and development are made about reciprocating air-cool oilless compressors series products in order to meet maket demond. Piston pings and guiding pings are made by filled PTFE material to achieve the oilless lubrication between cylinders and pistons. Grease lubrication bearings are used and designed in structure to achieve the oilless lubrication of connecting rod larger heads, connecting rod smaller heads and main bearings. The optimal dynamic balance can achieve by a new-type dynamic balance system which are made up of inner balance weight and outer balance weight to make the compressor run stationary. The crankcase bottom are all opened, three-stage fans are used to cool the compressor, these make the compressor cool better to improve the compressor life. The radius-length ratio λ is taken as 1/6 to 1/7 to reduce side pressure greatly. The reciprocating air-cool oilless compressors series products have better properties, can run smoothly and reliably and go into mass production.