It would be better if you advertised not just the pressure required to operate this rattle gun but also the air volumn rate of flow. When I attached it to my 3HP compressor it would not even torque 400Nm at 120psi. Disappointed I thought it may not be getting the flow of air required. So I had to by pass the air filter regulator and sure enough it worked . I can't be sure of the actual available torque but it certainly worked to tighten 500Nm. I like the gun and can recommend it.