cordless impact drivers torque rating?

[David9726]

I have a dewalt 20v model DCF886 1/4 dewalts website list it at 1500 in lbs that can not be correct? How do you get that to ft lbs...

I need more torque i assume that is what gets stuck bolts loose, i have ran into 30mm bolts and the little dewalt can not do but it will take most car lug nuts off.

I have a few dewalt 20v batteries so i have been looking at the dewalt DCF899B 1/2 it list 700 ft lbs of torque.

 

[bob15]

divide by 12

 

[PhysicsDude]

12 inch pounds = 1 foot pound.

1500/12 = 125 ft/lbs. The Dewalt 3/8" square impact wrench is rated for a comparable 150 ft/lbs, it probably has the same motor with different gearing and anvil setup to get a little more torque with a little less speed.

So a 1/4" hex impact driver with a 3/8" square adapter is not that different from a 3/8" square impact wrench, apart from some small differences in RPM/impacts per minute, etc. And the square tip anvil is stronger. I have personally broken off a (cheap) 1/2" square adapter in an impact driver on the hex shaft of the 1/2" square adapter.

If you want an impact you can use for heavy duty automotive stuff, like removing lugnuts, suspension work, etc., you definitely want the beefy DCF899B or something similar.

 

[KnurledNut]

So a 1/4" hex impact driver with a 3/8" square adapter is not that different from a 3/8" square impact wrench, apart from some small differences in RPM/impacts per minute, etc.

Torque is lost using the adaptor.

 

[GirlnAgarage]

The 899 looks like a beast, and I need it. Changed a hub assembly on my truck the other day without an impact - 263ft lbs on the axle nut...oy vey...

In the process, for shiggles I tried the 885 1/4" impact on the brake caliper bolts and flange bolts, but they didn't budge. Used the breaker bar. They felt like the lug nuts coming off around 140ftlbs, which is out of range for the little 1/4" impact anyway.

Anyway, if you need heavy duty get the 899. There's good videos on youtube, one guy in particular that does tool reviews does a torque test on the 899. Its impressive. I'm on the fence about the 3/8" impact because it's a more compact and lighter and I could use it for more stuff on the truck (that I currently use a breaker bar on now). But I think nahh, when I need the high torque I need the high torque.

 

[WWheeler]

Oh yes, the 899 is a beast. Every time I have to break it out I'm so glad I have it you just don't know, especially the older I get. However, a low or mid-range impact is extremely useful too. My brats tend to get used a lot more than Hoss.

 

[gdocktor3]

Oh yes, the 899 is a beast. Every time I have to break it out I'm so glad I have it you just don't know, especially the older I get. However, a low or mid-range impact is extremely useful too. My brats tend to get used a lot more than Hoss.

]

The 899 is the best tool I have ever purchased and I don't even wrench for a living...

The second best tool I ever bought was on this past Sunday. A Milwaukee M12 cordless 3/8" ratchet. Freekin sweeeeeet......

 

[David9726]

Oh yes, the 899 is a beast. Every time I have to break it out I'm so glad I have it you just don't know, especially the older I get. However, a low or mid-range impact is extremely useful too. My brats tend to get used a lot more than Hoss.

ok i'm really jealous.

BTW do you guys think the 700 ft. /lbs. is correct?

 

[PhysicsDude]

ok i'm really jealous.

BTW do you guys think the 700 ft. /lbs. is correct?

Its an accurate rating in relative terms to other impact wrench torque ratings.

Would it really put 700 ft lbs of real torque on a bolt in the real world? No, probably only half that. Does it put out as much torque as a 1/2 air impact made by a reputable brand rated at 700 ft lbs? Yeah probably.

Most of the major cordless tool companies have an impact rated at 600~800 ft. lbs, and all of them get good consistently good reviews in regards to their torque output.

 

[WWheeler]

ok i'm really jealous.

BTW do you guys think the 700 ft. /lbs. is correct?

I think it's very strong for a cordless impact. It seems pretty comparable to my IR 231 pneumatic if it could go free of the hose. Car / pickup suspension & lugs it just zips everything off like it's nothing to it. If you're wanting to use it on heavy equip or a semi it might struggle on some of the big stuff.

Here's a popular torque testing vid

<iframe width="560" height="315" src="https://www.youtube.com/embed/wUcHP7lRRgM" frameborder="0" allow="autoplay; encrypted-media" allowfullscreen></iframe>

 

[toplessHO]

got a good deal on a 821B for $65 NIB
bought an adapter for the 18v to 20v battery
seems like it puts out alot more with the 20v battery(5AH)
but its still only rated at 140 so dont see how thats possible
for the 3/8 to be that much

 

[pbon]

Milwaukee, Harbor Freight, Ingersol Rand all have battery impacts with over 1000lbs in reverse. I think one of them is around 1400 lbs. in the kind of DIY work I do, which is in cars, you need that only for a slightly corroded or “frozen” bolt. Maybe a transmission to bell housing bolt in the northeast where the roads are salted.

 

[marineman]

Milwaukee, Harbor Freight, Ingersol Rand all have battery impacts with over 1000lbs in reverse. I think one of them is around 1400 lbs. in the kind of DIY work I do, which is in cars, you need that only for a slightly corroded or “frozen” bolt. Maybe a transmission to bell housing bolt in the northeast where the roads are salted.

If you need 1,400 ft-lbs you need a torch and a new bolt.

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[6PTsocket]

Milwaukee, Harbor Freight, Ingersol Rand all have battery impacts with over 1000lbs in reverse. I think one of them is around 1400 lbs. in the kind of DIY work I do, which is in cars, you need that only for a slightly corroded or “frozen” bolt. Maybe a transmission to bell housing bolt in the northeast where the roads are salted.

I think they use terms like "nut busting torque" that may be more advertising than reality. It is in the same camp as "develops 5 peak horse power" and " 1000 watts of music power".

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[dacan23]

LMAO!!! I was planning on using my Milwaukee 1400 ft lb impact to power snap off the exhaust bolts on my 25yr old car next month when the new exhaust comes in. Though its never seen winter perhaps they are removable, anyways I am using new bolts anyways.

If you need 1,400 ft-lbs you need a torch and a new bolt.

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