Can I reuse TTY bolts?

Torque-to-yield (TTY) head bolts are designed to stretch when used. Once stretched, they are not as strong as before. Consequently, they cannot provide the same amount of clamping force and may break or shear off if reused.

How many times can you use TTY bolts?

All TTY bolts are 1-time use only. However, some rod bolts and main cap bolts can be tightened up to 3 times for assembly purposes. (Check your service manual for specific details.) When swapping heads or rebuilding an engine, always replace any TTY bolts with new ones.

Can torqued bolts be reused?

When the time comes to dismantle or reassemble, the question of whether or not to reuse nuts and bolts tends to come up. It is possible to reuse fasteners in some cases. However, only fasteners that have never been torqued beyond their yield strength may be used again.

How many times can you use torque-to-yield bolts?

What is a torque-to-yield bolt? It is a one-time-use fastener that is designed to stretch during the torquing process (installation). Because of this stretching, the integrity of the bolt is compromised. These bolts cannot and should not be reused due to the stress caused to the bolt during its first installation.

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Can you use stretch bolts again?

stretch to ensure proper securing when tightened down. (Bolts with Specification: Torque plus Angle). Some of these bolts can be reused, if you torque them to the same torque that you would use for a normal bolt of the same size, pitch, lubrication factor, and strength rating.

What happens if you overtorque a bolt?

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.

Can you torque a bolt twice?

Sophisticated torqueing equipment is utilized to tighten bolts just beyond their yield point. … However, because the tightening procedure does permanently stretch the bolt, there is some risk of breakage if the bolt is reused.

Can galvanized bolts be reused?

3: “Reuse: ASTM A490 bolts and galvanized ASTM A325 bolts shall not be reused. … If the bolts have been tensioned beyond their yield point, they enter the “plastic zone” (where they elongate and do not contract once the load is removed), which means they may be subject to premature failure.

Is it OK to reuse screws?

Generally, fasteners may be reused if the bolt never exceeded its yield point. … A bolt’s yield point represents the point at which it does not return to its original length when the load is removed. Like a spring, a bolt can take a permanent altered form if it is yielded and will remain longer after the load is removed.

Is it bad to reuse torque to yield bolts?

Torque-to-yield (TTY) head bolts are designed to stretch when used. Once stretched, they are not as strong as before. Consequently, they cannot provide the same amount of clamping force and may break or shear off if reused.

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What grade are TTY bolts?

The TTy bolts you will get from GM (or any pedders dealer) will be of the metric grade 10 variety, and they will have blue loctite on them. So yes, if you can find the exact same size bolts in a 10.9 locally, you can use them.

Do you lubricate head bolts?

As a rule, the threads and underside of the head on most standard automotive head bolts should be lubricated with motor oil before the bolts are installed. The torque values specified by the engine manufacturer are typically based on oiled threads and fasteners – not dry fasteners.

Can you reuse Grade 8 bolts?

RE: Reusing Grade 8 Bolts

As long as your fastener is kept within its elastic range, in most applications you should be fine reusing fasteners. If its a torque to yield application, then certainly reuse of the bolts would be a bad idea.