I've used in my short span of 37 years of turning nuts and bolts, a variety of 1/2" impacts. The CP 734 was my first (wore out three of them) and they're good for general automotive use, not a lot of peak torque, but small and light weight for their time. Got a 231 IR in the late "80's and am on my fourth one of them!! Kind of heavy, not too big as compared to the 1/2" Snap On MG 725 (model # ?), but has really good power for an old design!! I keep it greased at the rear fitting with a needle point grease gun and lube the motor with air tool oil on a semi-regular schedule. I've used other guys' Snap On, IR2135 (?), has a big body, Matco's composite (can't think of model #), Mac's version of the IR231 and a Nitro/Air Cat that one of my current co-workers has. The Air Cat surprised me, light/strong/fast and not that noisy!! I bought a rebuilt Snap On 3,8" last year from the dealer and as 3/8" impacts go, it's a good one. If you have good dealer support, either Snap On, Matco or Mac are good. I'm a little prejudiced toward the IR231 for everything but the weight, but you'll get a lot of good replies here!! Northern Tool has a good selection if you have a store close by to get your hands on. Sorry for the long reply, but that's my 50 cents worth!!
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Today's Featured Article - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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