How to prevent broken/seized bolts and thread galling.

'Thread Galling' is the term given to when stainless steel (and titanium) nuts and bolts seize up; a situation that increases when using nyloc nuts. Thread Galling often results when a lubricant is not used during assembly. It’s because of this that we strongly recommend a reliable lubricant on any nuts and bolts that are used during installation. 

The primary reason for the galling of stainless steel bolts lies in the thin protective oxide film that forms on stainless, aluminium, and titanium fasteners; a protective film that prevents corrosions on exposed surfaces. Additionally, this coating minimises friction and prevents direct metal-to-metal contact during fastening. This susceptibility is increased when the items are being tightened (during fastening) or are put under pressure, as the protective oxide film is scraped or rubbed off, thereby increasing the chances of galling to occur. 

We have included some industry best practice tips on how to prevent thread galling.

1. Slow Down Installation Speed: The heat that is generated by friction is a contributing factor to galling, and slowing down the installation speed can prevent galling. It is recommended that power tools not be used for the installation of stainless steel or other fasteners prone to galling. This is especially important when using nylon insert lock nuts as these nuts significantly increase the chance of galling.
2. Use a Lubricant Special anti-seizing or anti-galling lubricants can be used to dramatically reduce the chance of galling. 
3. Even a standard lubricant, such as WD-40®, can help reduce friction and prevent galling.