How To Avoid Thread Galling | Accu Tutorials

What is Thread Galling and how can it be prevented?
In this short video, we're taking a look at some of the most common ways of preventing this problem from occurring during fastener installation.
Thread Galling is also known as 'Cold Welding' - a form of adhesive wear which occurs during the installation of components, where further movement becomes impossible without significant force or even breaking the components.
This issue can be particularly problematic when using fasteners made from the same material grade. Titanium, Stainless Steel and Aluminium all produce a self-forming protective oxide layer. When this layer breaks down and the metals come into direct contact with one another and create friction, the resulting heat produced causes the metals to fuse together, causing the fasteners to seize up and lock together.
Particular care needs to be taken when fastening Locking Nuts, as these types of fasteners commonly generate high levels of friction and heat during installation.
Accu stock a wide range of locking nuts in thousands of different sizes, materials & finishes. Learn more about the best locking nut options for your application by watching the full length Locking Nuts video here:
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[@Alan_Stinchcombe]

Wherever possible, I would avoid using dissimilar metals to avoid thread galling, because it incurs a vastly increased risk of corrosion, which could itself cause seizure of the nut.

[@AccuComponents]

Hi Alan, we would always advise minimising the potential difference or breaking the electrical connection if using dissimilar metals. 🔩
You might find our article on 'Galvanic Corrosion And Ways To Prevent It' helpful too:
📲 www.accu.co.uk/p/334-what-causes-galvanic-corrosion-how-can-i-prevent-it

[@Alan_Stinchcombe]

Thank you for this link.
I think the guidance in your video needs a link to your article for customers who don't already understand the principles of galvanic corrosion.
And it's difficult to see how you could electrically insulate the nut from the bolt illustrated in your video.

[@simonroberts9759]

The obvious example is stainless steel. There are specific greases which should be applied to counter galling (cold welding).

[@AccuComponents]

Hi Simon, thanks for watching and you're right, greases/ lubricants are a good option depending on the end use of the fastener. We have more information on this in our article: www.accu.co.uk/p/151-what-is-thread-galling

[@scruffybob42088]

So anti-seize on the threads and use hand tools for installation, got it👍🏻

[@AccuComponents]

For sure! If you need to find the components and tools, be sure to check out our online store:
accu-components.com/