In today’s video, Nutter talks about why he believes using torque angle is a superior method of bolt tightening.
What is torque angle?
First and foremost, it’s not torque-to-yield.
Torque angle is really just a way of measuring the stretch of a bolt, Nutter says. Torque bolts stretch the first six or so times you use them and get them pulled into place, after they’re stretched to be about 82 ft.-lbs. of torque.
The problem is from the first time to the sixth time, you’re not seeing the same amount of stretch on the bolt. A fastener is actually a spring and it’s clamping the connecting rod together.
With torque angle, you’re basically using the thread pitch to mathematically figure out the length it’s going to extend when you torque the bolt a certain amount of degrees, Nutter says.
To see these principles in action, check out the video.