[Answered] Can You Reuse Torque To Yield Bolts?

Torque-to-yield (TTY) bolts are one of the crucial components in various mechanical systems and industries, including automotive, aerospace, and construction. Recently, a common question arises: can torque-to-yield bolts be reused?

The TTY bolts are specifically designed to provide a controlled amount of clamping force in critical applications. Reusing the torque to yield bolts is unable to put the same clamping force. Hence, you cannot reuse torque to yield bolts.

In this article, we will delve into the mechanism of torque to yield bolts, whether you can reuse them, and the potential risks of reusing them. So, without further ado, let’s dive in.

The Mechanism of Torque to Yield Bolts

Before going into any further details about whether you can reuse torque to yield bolts, you need to understand the mechanism of these bolts.

Torque-to-yield bolts are one kind of unique fastener that is typically used in high-stress applications where maintaining proper clamping force is essential.

TTY bolts are tightened using a specific torque value until they reach their yield point. For this reason, these bolts stretch and deform permanently to prevent joint separation and ensure structural integrity.

Are Torque to Yield Bolts Can Be Reused?

Now, let’s come to the point about whether Torque-to-Yield bolts are reusable or not. The straightforward answer is – No, you cannot reuse Torque-to-Yield bolts. Why? Here is the answer:

From the previous section, you have learned how the Torque-to-Yield bolts stretch during installation and the deformation they undergo. When a TTY bolt is tightened, it stretches beyond its elastic limit and reaches a deformation point to provide the required clamping force.

Once a Torque-to-Yield bolt deforms, it never goes back to its previous condition even after taking it out or loosening it. So, if you try to reuse a Torque-to-Yield bolt, it will not provide the same level of clamping force as it did during its initial installation. As a result, it will lead to potential failures or leaks.

What Can Happen If You Reuse Torque to Yield Bolts

You already have learned that torque-to-yield bolts are designed to stretch when used. Once they are stretched, they become much weaker than before and lose the ability to provide the same amount of clamping force. So, if you reuse TTY bolts, they may break or shear off.

Furthermore, TTY bolts are typically engineered with a specific yield point in mind. Reusing a bolt that has already reached or surpassed its yield point can lead to disastrous consequences, especially in safety-critical applications.

FAQs – Frequently Asked Questions and Answers

Can You Over Torque A Torque To Yield Bolt?

No, it isn’t recommended to over torque a torque-to-yield bolt. Because, when a TTY bolt is excessively tightened and torqued beyond its capacity, it surpasses its yield strength. As a result, it becomes unable to take the necessary clamp load.

Can Torque To Angle Bolts Be Reused?

Torque-to-angel bolts do not deform like torque-to-yield bolts. So, when the load on the Torque-to-angel bolts is released, it returns to its original length. Due to the fact that these bolts aren’t beyond their yield point, you can surely reuse them.

How Do You Tighten Torque To Yield Bolts?

You should follow the manufacturer’s torque specifications to tighten torque-to-yield bolts. First, clean bolt threads and mating surfaces. Then, apply the initial torque with a torque wrench. After that, use a torque-angle gauge to tighten the bolts further. Finally, verify if the torque meets specifications.

How Many Times Can A Torque To Yield Fasteners Be Reused?

Torque To Yield Fasteners are typically designed for single-use and you can reuse them (0) zero times. Because, once TTY fasteners have been stretched to their yield point, they should not be stretched again.

Conclusion

Torque-to-yield bolts are specifically engineered to deform permanently during installation. Thus, TTY bolts are not recommended for reuse. As there are safety considerations while using the torque-to-yield bolts, you must follow the manufacturer’s guidelines and replace TTY bolts instead of reusing them. If you have any further queries regarding this topic, feel free to ask in our comment section below. Thanks for reading.