Torque Wrench Extender - JeepForum.com
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post #1 of 12 Old 07-03-2019, 05:49 PM Thread Starter
jeep210
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Torque Wrench Extender

So last Friday I took my flat tractor tire to be fixed; needed a new tube. Dropped tire off drove around town running errands then picked up tire and headed home. On the way home my Jeep started a front end vibration at 45 MPH. I stopped to check it out but could not see a problem. So I slowly headed home. At home I checked again and saw smoke rising from behind left front tire.

A tear down revealed I needed new brake pads, also left bearing hub just did not spin right. So I decided to replace brake pads, rotors and both bearing hubs. The job went ok until I had to torque the axle nut. I didnt have a torque wrench that torqued to 175 ft Lbs. I checked at the airport hangar where I have some torque wrenches but still no go. So I was left with buy another torque wrench which I do not need or make a torque wrench extender. I chose the extender. Parts are all scrap plus a broken female drive. Welded it all together, 4.5 extension. Torqued those axle nuts with my current torque wrench. Here it is drying after spray painting it. I may never get the chance to use this tool again. Who knows??? LOL. Ive made many tools that Ive only used a few times. Mostly in the aviation trade.

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post #2 of 12 Old 07-03-2019, 06:14 PM
wingless
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Nice job!

Thanks for sharing.


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post #3 of 12 Old 07-06-2019, 09:22 AM
gearheadnick
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I'm curious as to how you know what the torque is with this extender? Is there some formula you used, or an app or something? I'm not bashing or insulting here, I'm truly curious since this would come in handy for me as well.
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post #4 of 12 Old 07-06-2019, 09:55 AM
Bossman302
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Quote:
Originally Posted by gearheadnick View Post
I'm curious as to how you know what the torque is with this extender? Is there some formula you used, or an app or something? I'm not bashing or insulting here, I'm truly curious since this would come in handy for me as well.
I have to agree with this. I would think that if you extended the point of contact with the torque wrench. Then the torque rating will be off. They call that leverage. Maybe I'm wrong.
Can anyone shed some light on this.

The Eggplant
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post #5 of 12 Old 07-06-2019, 10:22 AM
V8GCZJ
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X3! Wouln't it have been easier to just rent one?
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post #6 of 12 Old 07-06-2019, 10:23 AM
kg6mov
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Yes, adding leverage to the end of the wrench changes the reading. That's the point. With an extension of 4.5" you hit 175ft/lbs on the nut when you're reading around 125 on the wrench.

That's why this solves not having the right wrench.
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post #7 of 12 Old 07-06-2019, 10:32 AM
DRLExpress
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Originally Posted by gearheadnick View Post
.Is there some formula you used......
this should work.
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post #8 of 12 Old 07-06-2019, 10:36 AM
gutthans
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Quote:
Originally Posted by kg6mov View Post
Yes, adding leverage to the end of the wrench changes the reading. That's the point. With an extension of 4.5" you hit 175ft/lbs on the nut when you're reading around 125 on the wrench.

That's why this solves not having the right wrench.
Here's a formula you can use for getting it right:

https://www.norbar.com/en-gb/Home/To...ion-Calculator
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post #9 of 12 Old 07-06-2019, 01:44 PM Thread Starter
jeep210
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Well I called one place about a rental. One hundred dollars for a 30 day rental. That was my first and last call.

Yes, as pointed out there is a formula you must use to get the torque right. You have to use the formula for each wrench you want to use. Length of the torque wrench has to be considered. So a 15 and an 18 both 150 ft lbs max would be set differently.

Here is an online site I used. Easy to just plug in the numbers and hit calculate. You can also do the math, Easy Formula. I did the math to check the online site.

Calculator Site: http://www.cncexpo.com/TorqueAdapter.aspx

Just put in your numbers and get your answer.

Beware that you are measuring the extension for the center of the wrench drive to the center of the socket you are using. In my case 4.5. If I were to angle the drive to 45* angle my extension would less than 4.5 center to center; so torque wrench would have to be reset.

I thought this thread was fading. Suddenly it has picked up some torque energy. LOL.
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post #10 of 12 Old 07-07-2019, 08:53 AM
V8GCZJ
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Quote:
Well I called one place about a rental. One hundred dollars for a 30 day rental. That was my first and last call.

Who did you call? Most auto parts stores polices are like this...
https://shop.advanceautoparts.com/o/loaner-tools
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post #11 of 12 Old 07-07-2019, 11:10 AM Thread Starter
jeep210
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Actually it was one of my local auto parts store. I may have gotten a new employee as the person had to check on my request. When the cost of $100.00 was given, I just moved on. No biggie. I guess it prompted me to make this tool.
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post #12 of 12 Old 07-08-2019, 08:32 AM
zjosh93
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I have one I made myself that is very similar. Mine's 18 inches for my 18" wrench so it just doubles the torque. Made it out of a section of 1 1/4" roll cage tubing and a spare 1/2" extension. I needed to torque steering box nuts and axle nuts to spec and all the 1/2" torque wrenches that I could find for a reasonable price stopped at 150 ft lbs. Since then I've bought a TEKTON 24340 wrench on Amazon that goes to 250 ft lbs.

It's better to use a wrench made for the torque because any extender adds some error to the torque. It's usually okay though because large torques usually have fairly large acceptable ranges.
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