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ACinSC 
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 Topic: Torque limiting extensions
Posted: 01 Sep 2021 at 1:42pm |
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Anybody know how these work ? What happens when the torque limit is reached ? I've never seen any being used . Don't have a air gun myself , just curious . Thanks !
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dee_veloper
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Joined: 12 Apr 2021
Location: USA
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Posted: 01 Sep 2021 at 2:50pm |
How do torque limiting extensions work?
Torque sticks, also referred to as a “torque limiting extension bar,” are an extension for your impact wrench, and they basically act as a shock absorber. They work on a torsion theory, which is just a fancy way of saying they flex at a certain rate, then stop applying torque when they reach a specified flex point.
Google is so handy.....
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Don't confuse my personality with my attitude.
My personality is who I am. My attitude depends on who you are.
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ACinSC
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Posted: 01 Sep 2021 at 2:53pm |
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Does that mean they just slip off ? Doesn't sound like a good idea to me , just wondering if anyone has used them ? Thanks !
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WF owner
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Location: Bombay NY
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Posted: 01 Sep 2021 at 3:37pm |
Most of the tire shops in our area have stopped using torque sticks and are now using a real torque wrench. When I asked the manager of the tire shop I use, he said they weren't as accurate as a real torque wrench.
I believe they slip when they reach the torque they are rated for. In other words, the drive end is still turning, but the nut end stops turning when it reaches the rated torque.
Edited by WF owner - 01 Sep 2021 at 3:39pm
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steve(ill)
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Posted: 01 Sep 2021 at 3:45pm |
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They dont SLIP OFF... Just think of it as a heavy spring.. You can apply torque up to a certain level, after that the SPRING starts to move and you dont get any more torque.
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Like them all, but love the "B"s.
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ACinSC
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Posted: 01 Sep 2021 at 4:08pm |
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Ok , Thanks for the explanation . Makes sense .
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thendrix
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Posted: 01 Sep 2021 at 6:39pm |
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They twist when you get to the max torque rating
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"Farming is a business that makes a Las Vegas craps table look like a regular paycheck" Ronald Reagan
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ACinSC
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Posted: 01 Sep 2021 at 7:12pm |
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Thanks Tyler !
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JTOOL
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Posted: 01 Sep 2021 at 7:46pm |
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@ACinSC; Apologies if you know this already but an impact wrench works by applying the twisting force (torque) for an instant, stopping for an instant, and then reapplying the twisting force so many times per minute. The limiting extension will only twist so far with each application and twists (springs) back with the stopping, thereby only applying so much torque. That's how I understand it. I have a set, and they seem to work well when I've double checked them with my torque wrench.
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ACinSC
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Posted: 01 Sep 2021 at 8:01pm |
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Thanks Josh . That's a good explanation .
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Tbone95
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Posted: 02 Sep 2021 at 7:02am |
 WF owner wrote:
Most of the tire shops in our area have stopped using torque sticks and are now using a real torque wrench. When I asked the manager of the tire shop I use, he said they weren't as accurate as a real torque wrench.
I believe they slip when they reach the torque they are rated for. In other words, the drive end is still turning, but the nut end stops turning when it reaches the rated torque. |
Edited by Tbone95 - 02 Sep 2021 at 7:02am
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ACinSC
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Posted: 02 Sep 2021 at 7:37am |
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Yeah Craig , that's why I usually take my wheels off 2 at a time and take them to the shop loose when I need tires . Thanks
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Tbone95
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Posted: 02 Sep 2021 at 8:54am |
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Not a bad plan.
First thing I do when I get home loosen lugs, tighten with torque wrench. Beats breaking a wrench in the rain on the side of a freeway.
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Ted J
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Posted: 02 Sep 2021 at 4:49pm |
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I just recently almost had the left front fall off on my truck. So I'm following your advice Josh, I'm going to take em loose and torque em myself!
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"Allis-Express"
19?? WC / 1941 C / 1952 CA / 1956 WD45 / 1957 WD45 / 1958 D-17
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WF owner
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Posted: 02 Sep 2021 at 6:36pm |
Ted J wrote:
I just recently almost had the left front fall off on my truck. So I'm following your advice Josh, I'm going to take em loose and torque em myself!
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Reminds me of a story....
My nephew was going to diesel school in Ohio (Lima, I think). He had an old Mercedes that one of my daughters and her husband gave him. When he was home for a break, we put new brakes on the car just before he went back. The Mercedes had lug bolts, not lug nuts. I told him to make sure to retorque the wheels a couple times. He didn't. He called me and had lost the left front tire going about 80 mph about 5 hours from home (Buffalo area).
I went and got him, we trailered the car home and finally got enough parts to get it back together. I am betting he will never forget to retorque wheels again !
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