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I just bought a 1/2 '' craftsman impact wrench and wanted to know what size air compressor is needed to run it properly?

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If you plan on using it frequently and for extended amounts of time, you'll want a large one. If it's just for occasional use, a smaller pancake one will probably do, just make sure it has the pressure capability required for the impact wrench.

Posted on Dec 11, 2009

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Posted on Jan 02, 2017

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I just bought a craftsman pneumatic 1/2-in drive impact wrench. And used it with my craftsman 4-gallon 1hp air compressor tried to loosen the bolts on my car wheel wouldn't loosen them help


Pneumatic tools are rated in cfm (cubic feet per minute). Your 1 HP air compressor is rated at probably not more than 3 cfm while the 1/2 " impact driver needs at least 8 cfm, maybe 12 chm of air.
The compressor must provide more chm than tool rating needs.
It is a problem, by the time you look at five horse power air compressors and larger, a lot of electric power is needed. A circuit of 220 volts, 20, 30, or more amps would be required to run those large expensive compressors.
If you can, return the air tool and get a good electric tool instead.
Leave those high air volume air tools to shops that are so equipped to use, or invest if you must.

Jul 24, 2017 | Craftsman Air Tools & Compressors

1 Answer

Craftsman 1/2 inch air impact wrench i bought one and i don't see a chuck in the box nor do i see instructions on how to attach sockets....i've never had one before and don't want to sound like an idiot,...



  • There are no chucks with these newer impact wrenches. See that little ring on the tip of the socket shaft? That is a lock ring and that is what holds your sockets in place. You will want to keep a few 1/2 impact wrench lock rings around. There is a tool they make to aid in removing and replacing those rings but it is not necessary. You can use a small flathead screwdriver and walk the old one off and the same for replacing it. All you need to do is snap a socket on there real good and let'er rip.

Regards, Tony

Apr 23, 2011 | Craftsman 1/2" Impact Wrench

1 Answer

Im going to buy a compressor ! What is the min scfm comp that will run this tool for small jobs on my car?


Hi and welcome to FixYa, I am Kelly.

Air Tool consumptions are based on 15 seconds per minute (25%) of tool use.

Usage rates refer to the total time that air is flowing through the tool. If your applications result in more extensive usage, calculate air tool requirements as

follows.


(25%) 15 seconds = rated scfm x 1

(50%) 30 seconds = rated scfm x 2

(75%) 45 seconds = rated scfm x 3
(100%) 60 seconds = rated scfm x 4

Your impact wrench is rated a 8 CFM Cubic Feet Per Minute Usage

SCFM is Standard Cubic Feet per Minute (pre-compressed air volume)

I would be more concerned that the plumbing from the compressor tank could support the 8 CFM required by the 1/2" Impact. Remember the Air compressor will recover the pressure loss regardless of size. The only problem your going to have for "small jobs" is if you use too small of an air line to supply the impact wrench you are not going to get the full torque that it will produce to the drive head. In other words... a 1/4" supply line or 1/4 fittings anywhere in the system just isn't going to cut it even at 120 PSI. If you have the patience... a 5 gallon tank compressor that has the output volume required should be all that you need. I have been a mechanic over 4 decades and rarely have to use a 1/2 in impact for very long. Examples of 1/2" vs 3/8" useage. Wheel nuts, crankshaft pulley center bolt, some starters, steering, suspension and rear end parts. Other than that a 3/8" Impact works great.

One other thing you can do if you have an Air-Peen portable tank (with added fittings) is to add that in line with your output hose when your using the impact wrench so that you have longer use times.

I know this does not answer your what SCFM compressor is required question but it will resolve your needs. I just can't see telling someone that is a "small jobs" user to buy a larger compressor when really all they need is more volume for a brief period of time. The re-plumbed 1/2 inch output / in-line Air-Peen tank is a much cheaper and reasonable work around and you can disconnect that tank when your not using the impact wrench.
Lastly... if your inpact wrench has a SMALL male air fitting everything above will be a waste of time. You have to get that volume into the tool without restriction so that the rool will work properly for you.

Thanks for choosing FixYa.
Kelly

Mar 09, 2011 | DeVilbiss Excell ET501 12" Impact Wrench

1 Answer

How do you oil a Craftsman Air Impact Wrench Model No. 875191182?


Just put 3-5 drops of air tool oil down the air inlet coupler and then run the gun for 5 seconds. Do this everyday that you run the gun for best results.

Feb 25, 2011 | Craftsman 1/2" Impact Wrench

2 Answers

Dont know where to put oil in Craftsman 1/2 " Impact wrench


I just bought one of these also. Manual says oil goes into "the air inlet" which I'm thinking is where you attach the hose. That way the oil is sprayed throughout the interior of the gun once you run air through it.
Question for you: I can't get an impact socket onto this gun, almost seems like the square hole is too small. (yes, both are 1/2" drive). How do you get a socket on this stupid thing?
(man that sounds like I'm an idiot, but I've spent a half hour leaning all my body wight, wiggling, etc. and can't get a damn socket on)

Apr 29, 2010 | Craftsman 1/2" Impact Wrench

1 Answer

Craftsman 1/2 inch impact wrench,not working


Make sure you have at least 90 pounds of air and if you do you need to oil the wrench air tool oil pour some in the where the air line hooks up ..air tools need to be oiled daily cause compressed air cause water vapors to build up when you use it and then when it sits it begins to rust a bit and the oil stops this ...

Nov 14, 2009 | Craftsman 1/2" Impact Wrench

1 Answer

Wrench question


An air-powered impact wrench runs off of an air compressor with a tank – the air compressor should have at least a 10 gallon tank and be able to generate at least 3hp. Also, an impact wrench requires special sockets that are designed to withstand the high torque applied by the wrench.

Aug 27, 2008 | Porter Cable Cable Factory - Reconditioned...

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