Browse Products Buy Now Contact Us

Why Threaded Assemblies Fail

Functions of a Threaded Assembly

  • Create clamp force
  • Maintain clamp force
  • Allow disassembly


Why They Fail

Threaded assemblies fail because clamp force is not maintained. Threaded assemblies loosen because of:

  • Gaps: In order to make the assembly possible, nuts and bolts must have some tolerance, which creates gaps between the threads.
  • Vibration & Side-to-Side Movement: These gaps allow the parts to move from side-to-side when exposed to vibration.
  • Expansion / Contraction: Expansion and contraction can also cause side-to-side movement. This, in addition to vibration, leads to loosening and ultimately disassembly of parts.


Disassembly is Not Always Possible

This failure happens because, in certain conditions, a nut and a bolt can seize together. This seizing effect is caused by:

  • Corrosion, rust, when dealing with humidity, high temperatures, assembly of different metals (galvanic corrosion)
  • Galling (friction welding)

Learn how to remove the rust, with Loctite Freeze and Release

Watch video on how to remove threadlocker


LOCTITE® Threadlockers by Color


Discover the difference between Red, Blue, Green, and Purple Threadlockers

Learn More...

Product Search

Previous Blog Posts

Rejuvenate Your Spring Equipment
Posted March 31, 2014
by Kelly Matson

Getting Lawn Mowers & Tractors Ready for Spring!
Posted March 11, 2014
by Kelly Matson

Interactive Catalog