Originally Posted by oldred
These things are a knock-off (or is that rip-off?
) of the Ingersoll Rand "Thunder Gun" impact wrench and they perform quite close to the IR but at about half the price. They probably are not anywhere near the IR in quality but they do seem to hold up good, I have had mine several years now and it has been trouble free plus it is a real brute for torque!
Patent expired for the 231-series impact a couple years ago. We tried to re-new the patent but it was denied. Many knockoffs of multiple degrees of quality out there now. The 'Thundergun' and it's model number 232 were designed with higher RPM for racing vs the 231. Other than that most the internals are the same.