Thread Locker


Thread lockers are quite often referred to as “Locktite”, despite the fact that “Locktite” is actually a name brand thread-lock.

Purpose and Use

The working theory behind thread-locks is that they are an anaerobic adhesive that means they cure in the absence of air. Full strength is usually reached in about 24 hours. Thread-lock fluid is normally applied to the threads of fasteners such as screws nuts or bolts to prevent loosening due to vibration or shear.


Thread-lockers are usually available in two formulas, “permanent” or “removable”. Manufacturers normally use color coded labeling to indicate strength and permanent or removable characteristics.

Color Labeling


This is a high-strength permanent adhesive. It is applied to fastener threads before assembly. Although it forms a permanent bond, it is possible to dis

assemble the fastener using a high heat source. Doing this, you risk the possibility of breaking the fastener.


This medium strength adhesive and is applied before assembly. Use this thread-lock if you are not looking for a permanent bond. Disassembly can be done using hand tools.


This is a high strength adhesive applied to a fastener that is already assembled. It wicks down into the threads using capillary action. The fastener can be disassembled using hand tools.


This thread-lock is low strength and has many household uses.

Things to remember

  1. Using too much thread-lock will only make a big mess.

  2. Manufacturers’ strength specs can vary. Do some research or ask someone who has experience using thread-locks.

  3. Make sure your fastener is clean, dry, and with no rust.

Happy Motoring…Ron Couturier

#TechArticle #BritishCarArticles

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