Screws and bolts have always been known to loosen due to vibration, parts will fall off and with this it can cause some serious safety hazards. This is the reason threadlocker was invented.

A threadlocker is a liquid polymer that you put on the threads of the bolt before you tighten it in place, the polymer will set up with the absence of air, which will seal the threads in place preventing them from becoming loose from further vibrations.

There are three strengths of threadlocker

• Low Strength - for fasteners up to 1/4 inch and is good for bolts you may have to remove
• Medium Strength - for fasteners up to 3/4 inch, it is a bit stronger but is still removable
• High Strength - for fasteners up to 1 inch, this one will make a permanent seal that resists removal

The best way to apply a threadlocker is with a hand pump, by using one of these you will greatly reduce cost. A threadlocker bottle is filled approximately half full, the air in the bottle keeps the the material stable. When you dispense straight from the bottle it can lead to excessive dispensing of the product, by using the hand pump this will allow better control over the product and reduce the risk of using to much for your application.

Loctite has done tests on manual dispensing compared to hand pump dispensing and by using a hand pump you can reduce cost by 40%.  Manual dispensing locked 660 bolts where hand pump dispensing locked 1000 bolts.

If you find you need to remove a bolt after applying threadlocker the best way would be to use a hand tool with a good amount of leverage for the low strength and the high strength can be removed with a combination of heat and power tools.

Threadlockers are available in bottle ranging from 5 to 250 milliliters.