Prevailing torque lock nuts are reusable a limited number of times because the prevailing torque declines each time the nut is used.
However, because the tightening procedure does permanently stretch the bolt, there is some risk of breakage if the bolt is reused. And since there is no way to tell how many times a bolt has been reused, it doesn’t make any sense to reused TTY bolts – the risk far outweighs the replacement cost of used bolts.
Beside this, Can you reuse self locking nuts?
Nuts are designed to wear faster than bolts. For self locking nuts, it is acceptable to reuse them as long as there is still some locking action. … Because the nut insert hole is smaller than the bolt it creates so much friction between all of the threads that are in contact that the nut cannot vibrate loose.
Likewise, Can you reuse lock nuts?
Are Lock Nuts Able to be Reused? … They are able to be reused, but only if the prevailing torque meets certain specifications. Lock Nuts with a Nylon Insert are perhaps the most reliable lock nut, as it is only limited by the temperature of the application it has been used in.
Also, Why do they use torque to yield bolts?
Traditional fasteners are torqued to a load that will slightly stretch the bolt but won’t over-stretch it past its yield point. Torque-to-yield (TTY) fasteners are stretched beyond the point of elongation to ensure a more consistent clamp load on the joint.
Is it bad to over torque head bolts?
When you overtorque above 15% of recommended which in this case would be about 95 ft/lbs you basically turn the fastener into a rubber band. Some of the fasteners will stretch and you will have uneven torque. Add heat and pressure and head gasket blows and the head can even warp.
22 Related Question Answers Found
Can anchor bolts be reused?
Certain anchors are reusable—they can be removed and re-installed. Some anchors have machine screw threads, while others are designed to be used with wood screws, sheet metal screws, and/or lag screws. In these cases, you will most likely need to supply the screw.
Why is bolt torquing needed?
Torque is used to create tension. Bolts are used to affix two components so that they can resist tensile (pulling apart) and shearing (sliding apart) forces. After the nut has been turned onto the bolt, additional torque causes the nut to turn and stretch the bolt.
Can torqued bolts be reused?
Sophisticated torqueing equipment is utilized to tighten bolts just beyond their yield point. … And since there is no way to tell how many times a bolt has been reused, it doesn’t make any sense to reused TTY bolts – the risk far outweighs the replacement cost of used bolts.
What happens if you reuse a torque to yield bolt?
Torque-to-yield (TTY) head bolts are designed to stretch when used. Once stretched, they are not as strong as before. … Because the tightening procedure permanently stretches the bolts, there is a risk of breakage if reused.
Are torquing bolts important?
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 reuse metal drywall anchors?
After the drywall anchor and screw have been removed, they can be reused. The drywall anchor and screw may require a larger hole during reinstallation on the second go-around, and removing a drywall anchor that isn’t designed to be removed can potentially damage your wall or ceiling.
What does torque to yield mean?
A torque to yield fastener (TTY) or stretch bolt is a fastener which is torqued beyond the state of elasticity and therefore undergoes plastic deformation, causing it to become permanently elongated.
What happens if you don’t torque bolts?
Insufficient torque Alternatively, the engine’s vibrations can cause the bolt or nut to come undone, displacing the tensioner. This, in turn, will lead to incorrect belt tension and, eventually, to belt and/or engine damage.
How do you remove drywall anchors from metal?
Why do you need to torque bolts?
Torque is used to create tension. Bolts are used to affix two components so that they can resist tensile (pulling apart) and shearing (sliding apart) forces. After the nut has been turned onto the bolt, additional torque causes the nut to turn and stretch the bolt.
What can occur if bolts are not torqued properly?
Uneven loading created by unevenly tightened head bolts can distort the head. Over a period of time, this may cause the head to take a permanent set. So any head that has not been properly torqued should be checked for flatness prior to installing a new head gasket.
What happens if I over torque a bolt?
Everyone who has ever worked with fasteners has accidentally messed one up at some point. One of the most damaging ways to do that is by over-tightening, or over torquing the fastener. This can result in stripping screws, snapping screw heads and damaging pre-tapped threading.
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