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What does the degree number mean with torque values?....

Woodbridge

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Hi guys,

So, pertaining to lets say LCA's. The Teraflex Alpine IR LCA's spec 103 Ft Lbs +145º......What does the +145 degrees refer to?

Thanks
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AnnDee4444

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To expand further: At higher values, torque is not a good measurement for tension on a bolt. Properly lubed threads will turn easier, and will read a lower torque value at the same tension. Their instructions described the "turn-of-nut" method and is targeting a specific tension of the bolt.
 

rustyshakelford

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These are super fun and why we had to buy a nearly $700 digital snap on torque wrench that can do ft lbs plus angles.

Brett
 

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Chipe

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These are super fun and why we had to buy a nearly $700 digital snap on torque wrench that can do ft lbs plus angles.

Brett
Want to loan it to me for a while? :) :LOL:
 

rustyshakelford

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Want to loan it to me for a while? :) :LOL:
If you were much much closer I’m sure we could help ya out and do it on a lift :rock:

Brett
 

blnewt

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Just ask @cosine he knows!
What if your bolt torque is real close to your torque wrench max torque, like say a 145ft lb +90 degrees using a 150 ft lb max torque wrench, will that damage the torque wrench in that example?? Probably best to use a breaker bar for the last 90 degrees??
 

word302

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blnewt

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gandk

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So if you are rechecking torque a few weeks later, do just stop at the torque value and call it good?. Or give it the extra degrees again?
 

Headbarcode

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So if you are rechecking torque a few weeks later, do just stop at the torque value and call it good?. Or give it the extra degrees again?
As a long time truck and heavy equipment mechanic, I've always hated the light torque and added degree method of achieving final tightness. Unless the hardware becomes very loose, a click style torque wrench set to the initial lb/ft won't tell you anything. Using a breaker bar (because over torquing a torque wrench above its current setting will damage its ability to hold accuracy) to reapply the degrees can lead to over tightening, stretching, or snapping the hardware.

A beam-style torque wrench is required for the torque plus degree method. And recording the lb/ft that is reached before backing off the wrench, will help with future checks.

I know this is of little use to checking an already tightened bolt/nut, but unless the manufacturer can provide a final torque rating without the degrees, you'll have to get a beam-style torque wrench. Loosen the hardware and record the final number for future reference. All previous searches for a way to convert degrees to lb/ft have been fruitless. The consensus is that all accuracy goes way out the window.
 

gandk

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As a long time truck and heavy equipment mechanic, I've always hated the light torque and added degree method of achieving final tightness. Unless the hardware becomes very loose, a click style torque wrench set to the initial lb/ft won't tell you anything. Using a breaker bar (because over torquing a torque wrench above its current setting will damage its ability to hold accuracy) to reapply the degrees can lead to over tightening, stretching, or snapping the hardware.

A beam-style torque wrench is required for the torque plus degree method. And recording the lb/ft that is reached before backing off the wrench, will help with future checks.

I know this is of little use to checking an already tightened bolt/nut, but unless the manufacturer can provide a final torque rating without the degrees, you'll have to get a beam-style torque wrench. Loosen the hardware and record the final number for future reference. All previous searches for a way to convert degrees to lb/ft have been fruitless. The consensus is that all accuracy goes way out the window.
Great information! Thanks
 

Yellow Cake Kid

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The general concept is that the torque spec is sufficient to pull the assembly together, settle any movement, and evenly distribute the force applied by an array of fasteners. So we are advised to bring all the fasteners up to the torque specification before performing the supplementary angular procedure.

At this point it is acknowledged that subsequent tightening will be met with binding and friction that will make further observations of torque values meaningless in terms of equating the torque values to clamping force. Useful torque observations are best made with one smooth motion. Once you have stopped tightening the fastener(s) it is not practical to resume a smooth and even application of force. You will not be able to attribute the cause of the resistance accurately. It could be bolt tension, or it could be friction, and in actuality it will be some undetermined combination of both.

Tightening the bolts as per the angular specification introduces the tension that elongates the bolts, studs etc. and provides the necessary clamping force. The process de-emphasizes concerns about friction and binding and lets the mechanic more closely match the intended clamping force. The designers specify a base level torque spec that can be achieved before the problems with relying on torque measurement, as a proxy for bolt tension, become too influential. Then they calculate how much further the fastener should be tightened to achieve the working tension.



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