Generally 7-8 kilograms of a small air compressor can be, you can ask the buyer you buy riveting gun, the general demand for how much air pressure, generally 6 kilograms can be, but some riveting gun on the air pressure requirements of the higher, must be 7-8 kilograms. So it is recommended that you buy a larger air compressor, the riveting process will be better. I previously bought a rivet gun in Dongguan Kester 5-6 kilograms of air pressure can be hit, but hit the nut can not, the air pressure must be 7-8 kilograms to pull tight.