Chemical Threadlockers: How to Cure Fastener Failure Forever

by Julie S. on November 24, 2015

Chemical Threadlockers--How to Cure Fastener Failure ForeverThe ubiquitous threaded fastener. It’s arguably the most important detachable hardware ever. You rely upon multiple fasteners frequently, if not daily, to hold together your most critical parts. So, making sure you prevent threaded fastener failure is paramount to the success of your business.

Fasteners fail for two reasons: tension relaxation and self-loosening. Tension relaxation is caused by temperature changes, which make your bolts and substrate materials expand and contract. Self-loosening, caused by the lateral sliding between fastener contact surfaces, continues to be a problem even with mechanical locking methods.

Chemical threadlocking adhesives, however, are inexpensive and permanently prevent fastener failure. Loctite® threadlockers come in four grades for a broad array of applications and are color-coded for easy identification: red, blue, green and purple.

Red is the highest strength. It is so powerful it requires heat to be disassembled. The blue threadlocker is medium strength and can be removed with hand tools. It is available as a liquid and a semisolid. Loctite also makes the QuickTape®249™ Threadlocker, which is the only one of its kind in the world. The green threadlocker is recommended for locking preassembled fasteners such as electrical connectors and set screws. Green is categorized medium-to-high strength for wicking and is also available in liquid form. You can remove it with heat or hand tools. Loctite’s purple threadlocker is ideally suited for low-strength metals such as aluminum and brass.

Regardless of your application, chemical threadlocking adhesives for metal-to-metal applications cure to a hard thermoset plastic for the cure of a lifetime.

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