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Like most tools it depends on how much$$$ you want to spend VS how much you will use it.
Had a couple of crap used wrenches that I bought at garage sales then broke down and bought a IR 2131. It will last me a life time and with the good brand name wrenches you can buy a rebuild kit.
The cheaper wrenches will turn 1/2" rusty bolts with 175 psi turnin em, for a while.
Chicago Pneumatic 734 1/2" drive with 160 psi, ported,drilled, cut, everything that was needed to get the air to flow through the gun, will twist off 5/8" grade 8 bolts and strip the threads from a 3/4" grade 8 bolt, the gun could strip the threads from a 3/4" u-bolt on big truck where the super duty 1" IR hooked to the same air line would not rotate the nut, it will also shake in your hand so much that it feels like the case is going to explode, I would hook it up to a 3/8" air line, used in a big truck repair facility, had to get rid of it, made me afraid to use it, 231 IR is a nice gun, alittle heavier in weight than the CP734, the reverse control is not as nice on the IR as the CP, have had both and the 734 is my preference, not as heavy, fits my hand better, easier control from forward to reverse, (can be switched faster) to break up rusted bolts. CP have seen from 50 bucks to 150 bucks. .02
Ingersol Rand all the way!!!
Mac air tools are made by ingersol BTW
The IR 231 series had been around forever and is bullit proof and all that most home mechanics will ever need. For all out power Try the Ingersol IR2135Ti This thing is amazing.
I have one at work and it has almost as much power as my 3/4 drive impact. Warning if you by the 2135Ti make sure you have good impact sockets like MAc, Snap-on , proto etc as this gun will shatter cheap impact sockets
Hope this helps
Andy
I've been happy with my Craftsman Professional wrench, the one with a four position dial on the back and the two red buttons on the back for direction.
I've had it now for two years and while I don't make a living with it I've used it a LOT for a home mechanic. I've busted loose things like rusty radius arm nuts and lower coil spring seat nuts without it breaking a sweat. The only fasteners it won't break loose are things you'd have to torch anyway, have run into very few that it won't take and we live in salty road country (NY).
Before everyone says, "Bah, Craftsman is junk!", it looks EXACTLY like an IR 2131 with exactly the same torque specs, just a different name sticker.
First impact was a CP 734 Bought new lasted my years we just wore it out.
Second one Snap on Paid twice as much as the CP only lasted half is long.
Third one IR 231 Bought used at a auction for 1/2 of what I paid for the CP 734.Has outlasted both of them combined!! 10 years and not one problem and I use it daily.
I agree its bulletpruff. If it ever dies I will with out a dought buy a new IR!!