After a very disappointing experience with a 1/2 in Craftsman electric impact wrench from Sears, I began my quest for something that could actually take lug nuts off my Acura. You would have assumed a $160 "Powerful Craftsman" could do it, but it barely moved one 19mm nut torqued to approx. 80 lb-ft. I needed something more. A google search revealed the Hitachi WR22SA on Amazon with an excellent review, so I bought one for myself.
Make no mistake.. it may be electric, but this thing is a very serious tool. First, it is BIG and HEAVY. The Amazon "Product Details" lists it at 17.2 LBS which sounds accurate. It will give your wrist a workout just holding it up, but it is worth it for the shear power it pumps out. It removes lug nuts with ease. I performed a brake job with it, and it saved me a huge amount of time and work. Because it is so powerful, it really doesn't twist in your hands as I expected it would.
The impacts happen so quickly, the nut/bolt is off instantly. Be careful, because once it enters free-spin and can throw things with force. If you plan on using smaller 1/2 impact sockets from NAPA, Sears, etc., you will need to buy a 3/4in to 1/2in adapter. They are very hard to find locally, but online, there are several stores that offer them. This way, you aren't limited to only large 3/4 socket sizes.
I would recommend this tool to anyone that does not have access to a powerful air compressor but needs something strong with 110 AC. The price is steep, but worth every penny. Get more detail about Hitachi WR22SA 7.5 Amp 3/4-Inch Electric Impact Wrench.
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