1/2" Composite Impact with 1300 ft-lbs of loosening torque. Patented ergonomic Kevlar handle and housing. Patented Exhaust Technology - only 86 dBa. Smooth hard hitting Twin Clutch Mechanism. Patented Forward-Reverse switch. Built for the toughest applications like Crank Bolts.
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So I searched for the strongest 1/2" gun on the market and came up with Nitrocat 1250K. I bought it from Amazon. It came in a nice cardboard box with the Aircat bag and some paperwork. The operating instructions lists max torque at 90 psi air supply as 950 ft-lb and weight as 4.5 lb. Declaration of conformity lists max torque as 1300 ft-lb and weight as 4.3 lb.
It is very easy to check the weight since I have a precision calibrated scale. It came to 4.855 lb without any accessories or fittings attached. It is still significantly lighter than my HF gun.
It is much more difficult to check the torque rating. This is what I did. I have torqued several 1-1/8" hex cap screws to 600 ft-lb with a torque wrench (max torque on the wrench) and used Nitrocat to remove them. I have used 3/4" impact socket and a 1/2" adapter. 1250K did not hesitate to remove all the screws at 100 psi air supply. Later it removed my anode rod with no problem. It was not rusted in place, just very tight.
There are a couple of things that I don't like. The 1/2" square part of the anvil is very short at .350", it should have been a little longer. The air inlet has a 23 mm hex, which is non-standard and you have to use an adjustable wrench to torque the fitting. Also the instruction does not say a word about lubricating the hammer case. It is important you do that periodically - there is a port in the hammer case with a set screw just for that.
Despite these few drawbacks I like the gun and hope it will last for many years with a light hobby use.
For intermittent use it is not important how big your compressor or air tank is. My compressor is a little Makita with 3.3 CFM @ 90 psi and 2.2 gal tank. I use it to pump an auxiliary 11 gal tank and this is where I connect my impact gun. What is very important is the air flow to the tool. Impact guns need a lot of air flow to develop full torque. I am using 3/8" fittings on mine with a short 3/8" hose to help the flow. Do not forget to check the output valve on your tank to make sure it does not restrict the flow.