Can torque relate to tightness of bolts?

Can torque relate to tightness of bolts?

Typically the torque needed to untighten a newly tightened fastener is around 10% to 30% less than the torque to tighten it further. When you are tightening a threaded fastener a significant amount of torque is needed to overcome friction in the threads and under the nut face (or the bolt head, if the bolt is rotated).

Why it takes less torque to loosen a bolt than to tighten it?

In short, it takes less torque to loosen a threaded fastener than it does to tighten it, because the pitched threads act like an inclined plane. Anyone who has strained against a badly rusted fastener knows that they’re sometimes impossible to remove without the persuasion of a cheater bar or blowtorch.

Is it better to over torque or under torque?

The Importance of Proper Torque Typically, an under torqued bolt will deform and be unable to provide as much clamping force as needed. An over torqued bolt will break.

Can you over tighten with a torque wrench?

A torque wrench prevents but do not avoid over tightening! The good practice here is to start over : Loosen the bolt first, tighten with an adapted tool and finish with the torque wrench to reach the correct and safe torque.

How do I know if my torque is loosening?

Simply take a bolt or screw that is tightened and start to loosen it progressively. Be keen and record the exact torque reading when the fastener becomes loose. The torque value necessary to loosen the fastener will be the approximate force that was exerted to the joint.

What happens if you have too much torque?

Too much force can cause a technician to strip threaded fasteners or stretch bolts beyond their limits, which can result in loose nuts or cause the bolt to crack and break.

What should you not do with a torque wrench?

Never use it on worn out/cracked bolt or fastener and do not use if drive of a wrench is worn out. Otherwise, you will not get a good result. Always inspect the jaws, knurl and socket from the inside. Do not use it in heavy rain or high humidity or in places where chance of water penetration is high.

When do you apply torque to a fastener?

Working with Fasteners requires the utmost care at time, while others times you need to apply brute force. A common Fastener question that workers in many industries ask applies to torque. When tightening Hex Bolts or other Nuts and Bolts, are you better to apply torque to the nut or the bolt head? Is one method more likely to result in breakage?

Do you apply torque to the nut or the bolt head?

In many situations you can apply torque to either the nut or the bolt head. Both will result in a tight connection and neither will avoid breakage more often (that occurrence can be avoided through other means).

What happens when you tighten a nut on a fastener?

Both springs stretch measurably, but the weaker one stretches more. Part of the external load is absorbed by the joint and part by the fastener. To be crystal clear, as you tighten the nut the bolt will compress the two parts together.

What happens when force is applied to a fastener?

Bolts actually stretch very slightly when force is applied, which causes the loading on each thread to be different. Because of this stretch, when you apply a tensile load on a threaded fastener the first thread at the point of connection sees the highest percentage of the load.