A special glue for holding metal to metal screws in their sockets so they don't come loose in a strong vibration environment. Loctite is color coded by strength, red being the strongest and blue being medium. Most people use blue locktite because if red is used the screws may never come out again.

A waterproof adhesive used to secure threaded connections on pipes.

Loctite branded adhesives called threadlockers are used to prevent screws and bolts from coming unscrewed. It is also used in many industrial applications for the same purpose. Loctite threadlockers are anaerobic adhesives that are based on methacrylate.Loctite Corporation began in the Trinity College basement laboratory of Dr.