Regarding the seized stainless steel nuts and bolt. This is referred to as thread galling and can be a symptom of stainless steel and titanium, especially when there is nylock nuts involved .
We have included some industry best practice tips on how to prevent thread galling.
1. Slow Down Installation Speed Because heat generated by friction is a contributing factor in galling, 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. Examples include WD40)
3. Even a standard lubricant, such as WD-40®, can help reduce friction and prevent galling.
Why Are Stainless Bolts Prone to Galling?
Stainless, aluminium, and titanium fasteners form thin protective oxide films on their exposed surfaces that prevent corrosion. In addition, this coating reduces friction and prevents direct metal to metal contact during fastening.
The protective oxide film can be rubbed or scraped off under the pressure and movement of the fastener being tightened. When this happens these relatively soft metals come into direct contact. Friction increases and the chance of galling increases significantly.