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Tool Talk Discussion Forum

Impact wrench- torque needed

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eeleater

04-13-2008 07:03:45




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I have a 9N I am going to be doing some work on and recent got a used compressor- (60 gallong 125 psi setting and 3 hp motor). I am going to be getting some air tools, and am wondering how much torque is needed in the larger impact wrenches- and what sizes I need.

I anticipate getting a 3/8 ratchet and 1/2 in impact wrench. How much torque in the 1/2 in wrench? There seems to be a significant range- as well as price. I have also noted single and double hammer

Am I likley to end up needing a 3/4 impact wrench?

? Better off with better quality 3/8 and 1/2 in wrench and inexpensive 3/4 (or 1 inch) for ocassional use?

Please educate me. (and I already know the compressor has its limits)

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Owen Aaland

04-14-2008 18:14:41




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 Re: Impact wrench- torque needed in reply to eeleater, 04-13-2008 07:03:45  
If you are going to need a long hose, go with a 1/2 size and then use a 6 to 10 foot length between it and your wrench. You will get the advantage of the 1/2 air delivery but the ease of use of the 3/8 near your tools.



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John in Ct

04-14-2008 13:40:05




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 Re: Impact wrench- torque needed in reply to eeleater, 04-13-2008 07:03:45  
I would get a good brand, powerful 1/2" air one. It will handle most of your needs. Don't forget, 3/4" will also need 3/4" sockets! For ease of use and if you can afford it, get a top quality 1/2" battery cordless one. It comes in handy like a cordless drill if you know what I mean. While it doesn't have the power and won't replace a 1/2" air impact, you will end up using it most of the time.

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504-2

04-13-2008 20:15:33




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 Re: Impact wrench- torque needed in reply to eeleater, 04-13-2008 07:03:45  
For the money buy an Ingersoll Rand 231 and spend the money and buy the extended anvil model, I have both and the short nose stays in the tool box. (at least the last 4 years)



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Dave 2N

04-13-2008 14:21:29




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 Re: Impact wrench- torque needed in reply to eeleater, 04-13-2008 07:03:45  
Get an Ingersoll-Rand Twin-Hammer impact.



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MPK

04-13-2008 13:18:23




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 Re: Impact wrench- torque needed in reply to eeleater, 04-13-2008 07:03:45  
Watch the torque rating on the tools. Get a good quality high torque 1/2 inch instead of a cheap 3/4 inch. I learned this the hard way. The good 1/2 in. will beat the cheap 3/4 inch.



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moonlite 37

04-13-2008 17:05:03




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 Re: Impact wrench- torque needed in reply to MPK, 04-13-2008 13:18:23  
YES! and uses less air



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fixerupper

04-13-2008 10:18:16




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 Re: Impact wrench- torque needed in reply to eeleater, 04-13-2008 07:03:45  
Whatever brand or model air tool you get, plenty of air flow to it will help it run at it's best capacity. In my opinion 3/8" hose is a minimum for 1/2" air tools. 1/2" hose is a little overkill and more clumsy for 3/8 or 1/2" tools but you will need it if you go with any 3/4" tool. You really don't need a whole lot of pressure if you can get enough flow to it.
Needless to say the fittings coming out of the compressor need to match the hose. The neighbor bought a 3/4" CP air wrench that was gutless so they put it on the shelf for a few years, thinking it was junk. Well it was gutless because they were using a 3/8" hose. The 3/8" hose finally went bad and they replaced it with a 1/2" hose. The gutless air wrench suddenly had plenty of power and speed. Jim

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NcNE

04-13-2008 10:18:05




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 Re: Impact wrench- torque needed in reply to eeleater, 04-13-2008 07:03:45  
Believe it or not John Deere makes a decent 1/2" impact. Double hammer, 700 ft. lbs. and weighs 4.5 lbs priced around $200. I was really skeptical but the price was right so I gave er a shot. Works really well.



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Dave 2N

04-13-2008 14:19:44




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 Re: Impact wrench- torque needed in reply to NcNE, 04-13-2008 10:18:05  
Who makes it for them?



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sherburne

04-13-2008 09:34:04




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 Re: Impact wrench- torque needed in reply to eeleater, 04-13-2008 07:03:45  
The compressor is great, as long as it fills the sixty gtallons and shuts off, even if you have to turn down the cutout psi.
I bought an IR 231 1/2" wrench some time ago. I had it rebuilt in 1988. It didn't wear out. It ingested something. It still works perfectly. They still make it, hopefully as well.
Harbor Freight and Northern Hydraulics(Tool) Asian have come and gone.



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glennster

04-13-2008 09:26:18




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 Re: Impact wrench- torque needed in reply to eeleater, 04-13-2008 07:03:45  
for your half inch impact, get a good quality unit. the farm and fleet and big box store impacts are low on power and use a lot of air. napa sells a decent 3/8 air rachet, their impacts arent bad either. if you want a super bad 1/2, i upgraded to a snap on 1/2 magnesium case. 800 ft lbs breakout force, cost just under 400.00, but it will do the job. you gotta wear ear protection with this one.
third party image

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jose bagge

04-13-2008 09:25:21




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 Re: Impact wrench- torque needed in reply to eeleater, 04-13-2008 07:03:45  
get the double hammer impact. The real advantage to impact is tear-down...always hand torque after using a gun to snug up. An impact will "reliably" deliver about 100 ft/lbs- but that "hammer" action is a lousy way to apply torque, so do it by hand. The "hammer" action is what makes it so effective at loosening tight/rusty/stripped stuff, though.

unless you are working on dozers or semis, I would consider 3/4" to be overkill. now, a 3/8 gun is nice to have (in addition to the 3/8 air ratchet)...and an air chisel very useful and inexpensive

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135 Fan

04-13-2008 16:18:53




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 Re: Impact wrench- torque needed in reply to jose bagge, 04-13-2008 09:25:21  
On a dozer a 3/4 sometimes isn't enough! I was working on track frames all weekend. 3/4 drive socket with a 6 ft. snipe works good to initially loosen, then I used a Makita electric 3/4 impact. It worked pretty good for electric. I know a good air 3/4 would have more torque. For max torque, nothing beats a hydraulic torque wrench. Some of them go to 10,000 ft. lbs. or more I think. Dave



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