What is a Threadlocker?
Threadlocker is a general term for a liquid polymer designed to brush on fastener threads just prior to installation. Threadlocker dries and locks fasteners in place, protecting the threads against water, rust, and leakage. It is especially useful in the assembly of moving parts, engines, hobby toys, and plumbing applications where, for example, a loose gasket screw can result in water damage. There are several different types of threadlocker designed for different jobs. Large screws, bolts, bushings and studs require strong formulas. This type of threadlocker normally rates its holding power by pounds per square inch, or PSI. A heavy-duty threadlocker such as that used to assemble engine parts like rocker arms, shock absorber bolts, or frame bolts might be rated at 3,000 PSI. There are also medium grade and light-duty threadlocker formulas for fasteners as small as computer screws. Threadlocker also comes in “permanent” and “removable” blends. Fasteners installed with permanent thread
