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#4580395 - 11/20/17 07:07 PM Digital Torque wrenches
Ndx Offline


Registered: 04/04/08
Posts: 1830
Loc: IL
Hi Guys,

Any recommendation on Digital Torquewrench?
3/8

Something that will be accurate at

37ft lb
19 ft lb


So 15-40 ftlb great accuracy ...

Thank you

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#4580410 - 11/20/17 07:15 PM Re: Digital Torque wrenches [Re: Ndx]
Merkava_4 Offline


Registered: 01/30/07
Posts: 17501
Loc: Clovis, CA
There's no point in getting a digital torque wrench unless you need to set angles for Torque-To-Yield fasteners. And if that's the case, the only digital torque wrench I'd recommend is $nap-on.

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#4580431 - 11/20/17 07:42 PM Re: Digital Torque wrenches [Re: Ndx]
justintendo Offline


Registered: 03/04/17
Posts: 104
Loc: northwest pa
cdi...who make a good chunk of all snap on wrenches.
i will say i like split beam the best...digital is not needed.


Edited by justintendo (11/20/17 07:53 PM)
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#4580436 - 11/20/17 07:47 PM Re: Digital Torque wrenches [Re: Ndx]
skyactiv Offline


Registered: 03/02/13
Posts: 4518
Loc: The Midwest
I'm a semi mechanic by trade.
I have the older version of this in my toolbox at home: http://www.sears.com/craftsman-micro-clicker-torque-wrench-3-8inch-drive/p-00931424000P
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#4580491 - 11/20/17 08:38 PM Re: Digital Torque wrenches [Re: Ndx]
doitmyself Offline


Registered: 06/03/02
Posts: 6275
Loc: MI
Originally Posted By: Ndx
Hi Guys,

So 15-40 ftlb great accuracy ...Thank you


I don't think that an electronic digital torque wrench exists in that range. 1/4" wrenches only go up to about 24 ft. lbs. max. and 3/8" wrenches all seem to go up to 100 ft. lbs., making them inaccurate below 20 ft. lbs. (20% of scale).

You will have to buy two digital wrenches to cover that range.

A 75-80 ft. lb. micrometer torque wrench would fit your criteria. Here's an example of a good one: https://www.amazon.com/CDI-752MFRMH-Torque-8-Inch-Micro-Adjustable/dp/B002L9Z27E or https://www.protorquetools.com/cdi-3-8-d...nch-dual-scale/

Chinese and Taiwan models are available also. Hope this helps.

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#4580531 - 11/20/17 09:09 PM Re: Digital Torque wrenches [Re: Ndx]
redbone3 Offline


Registered: 06/09/12
Posts: 662
Loc: Reno, NV
https://www.protorquetools.com/3-8-dr-10...racy-1002cf3ha/ The 20 to 100% rule doesn't apply to digital torque wrenches. This one would do the trick. But I question the need for such accuracy.
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#4580544 - 11/20/17 09:18 PM Re: Digital Torque wrenches [Re: Ndx]
Ndx Offline


Registered: 04/04/08
Posts: 1830
Loc: IL
Thx guys ...

Accuracy for piece of mind...


One more question beam style vs clicker

Any opinions on this

https://www.cpooutlets.com/platinum-tools-c2fr100f-3-8-in--drive-100-ft-lbs--split-beam-click-type-torque-wrench/prenc2fr100f,default,pd.html?cgid=automotive-hand-tools-torque-wrenches

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#4580545 - 11/20/17 09:22 PM Re: Digital Torque wrenches [Re: redbone3]
doitmyself Offline


Registered: 06/03/02
Posts: 6275
Loc: MI
Originally Posted By: redbone3
The 20 to 100% rule doesn't apply to digital torque wrenches.


It does on the good ones: http://public.snapon.com/a_prodannouncements_us/ATECH1FR240B_NPA.pdf

Seems like it applies to the lesser ones also: http://www.gearwrench.com/gearwrench-85076-3-8-electronic-torque-wrench-7-1-99-6-ft-lbs.html

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#4580553 - 11/20/17 09:30 PM Re: Digital Torque wrenches [Re: Ndx]
doitmyself Offline


Registered: 06/03/02
Posts: 6275
Loc: MI
NDX,

When talking about torque accuracy, remember that the torque process can easily be off by +/- 25% due to many variables. So, the accuracy difference of a torque wrench of 2% vs. 4% is a moot point.

The Precision Instruments torque wrench you link to is very highly regarded as an excellent U.S. made torque wrench. Check out reviews at the Garage Journal forum. It doesn't work in the reverse direction, but that is a very rare need. This wrench used to be supplied to Snap-On, with the only difference being a Snap-on ratchet head.

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#4580573 - 11/20/17 09:46 PM Re: Digital Torque wrenches [Re: Ndx]
Ndx Offline


Registered: 04/04/08
Posts: 1830
Loc: IL
Thank you sir ...

How to understand the 20% rule ?

So lowest is 20 ft lb .... so it will be accurate from 24 ft lb ?

20 + 20% = 24 ?

Thank you

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#4580574 - 11/20/17 09:46 PM Re: Digital Torque wrenches [Re: doitmyself]
redbone3 Offline


Registered: 06/09/12
Posts: 662
Loc: Reno, NV
Originally Posted By: doitmyself
Originally Posted By: redbone3
The 20 to 100% rule doesn't apply to digital torque wrenches.


It does on the good ones: http://public.snapon.com/a_prodannouncements_us/ATECH1FR240B_NPA.pdf

Seems like it applies to the lesser ones also: http://www.gearwrench.com/gearwrench-85076-3-8-electronic-torque-wrench-7-1-99-6-ft-lbs.html


Most of the digital ones have a derated accuracy from 10 to 20% of range: http://www.cditorque.com/manuals2010/CDI_Manual_Computorq3.pdf
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#4581305 - 11/21/17 06:50 PM Re: Digital Torque wrenches [Re: redbone3]
doitmyself Offline


Registered: 06/03/02
Posts: 6275
Loc: MI
Originally Posted By: redbone3
Most of the digital ones have a derated accuracy from 10 to 20% of range: http://www.cditorque.com/manuals2010/CDI_Manual_Computorq3.pdf


You are right! I stand corrected. Thank you.

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#4581396 - 11/21/17 08:13 PM Re: Digital Torque wrenches [Re: Ndx]
Cujet Offline


Registered: 02/15/03
Posts: 7242
Loc: Jupiter, Florida
I just used the Snap On digital torque wrench today. Loved it. However, I will say that an old school dial torque wrench is, quite possibly, slightly easier to use quickly. As pre setting the torque number takes time. When one has to step up torque multiple times, on multiple sized fasteners, stopping to reset takes time.
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#4581671 - 11/22/17 07:50 AM Re: Digital Torque wrenches [Re: Ndx]
doitmyself Offline


Registered: 06/03/02
Posts: 6275
Loc: MI
Originally Posted By: Ndx
How to understand the 20% rule ?

Here's Precision Instruments accuracy statement: "Accurate within 4% of reading from 20% of full scale to full scale." On a 100 ft. lb. wrench, P.I.'s 4% accuracy would apply between 20 ft. lbs. and 100 ft. lbs.. A 250 ft. lb. wrench should have the stated accuracy down to the 50 ft. lb. range (20% of 250). Using a torque wrench below the 20% of full scale might be inaccurate, even if the wrench has a scale that goes down to zero. This is a basic guideline for purchasing and using the correctly ranged wrench.

redbone3 educated us that electronic digital wrenches give accuracy ratings down to 10% of full scale, with only a slight loss of accuracy in that range (10-20%).


Also, FYI, if you are intent on a digital model, I was in Home Depot yesterday and noticed that their Husky 3/8 model is an 80 ft. lb. wrench, meeting your original criteria. Lifetime warranty, which is very unusual for torque wrenches. https://www.homedepot.com/p/Husky-5-80-f...TWDIG/206096361

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#4582952 - 11/23/17 01:28 PM Re: Digital Torque wrenches [Re: Ndx]
ms21043 Offline


Registered: 07/14/07
Posts: 334
Loc: hawaii
I have a Snap On 3/8 drive digital, I would never buy another. They drain the batteries when they're turned off. It wasn't just mine, we have several at work and they all do the same thing, you need to install the batteries before you use the thing and remove them when you're done. Also, you need to be careful with chemicals near the plastic display lens and handle. I do like that you can switch between ft lbs, inch lbs and newton meters, that you can see the torque as you come up on it, that they vibrate and beep when you reach the set torque and hold the actual torque you reached on the display momementarily.


Edited by ms21043 (11/23/17 01:31 PM)
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