Threadlocker is a liquid polymer used to lock fasteners in place, protecting them from water, rust, and leaks. Different formulas are available for different purposes, with holding power rated in PSI or kg/cm2. Threadlockers can be permanent or removable and are available in small bottles at various stores.
“Threadlocker” is a general term referring to a liquid polymer designed to be brushed onto the threads of fasteners, such as screws, just before they are installed. The polymer dries and locks the fasteners in place, protecting the threads from water, rust and leaks. Threadlockers are especially useful in the assembly of moving parts, motors, hob toys, and plumbing applications where, for example, a loose packing screw can cause water damage.
Purposes and formulas
There are different types of threadlockers designed to be used for different purposes. Large screws, bolts, bushings and studs require strong threadlocker formulas. Some manufacturers of these formulas color-code their products by category to make shopping easier. For example, heavy formula might have a red color code on the packaging, and light formulas might be purple or blue.
Any type of threadlocker has usually had its holding power tested and rated. This is recorded and reported in pounds per square inch (PSI) or kilograms per centimeter (kg/cm2), which is the force that must be exerted to “unclog” the thread locker so the fastener can be removed. A heavy-duty threadlocker used to assemble engine parts such as rocker arms, shock absorber bolts, or frame bolts might be rated at 3,000 PSI (about 210 kg/cm2). There are also medium and light grade formulas for fasteners as small as computer screws.
Types of thread lockers
Thread lockers can come in permanent or removable blends. Fasteners that have been installed with a permanent thread locker applied may require heat or power tools to remove. Instructions that come with a permanent formula typically tell the user how to remove a fastener that has been applied threadlocker. Parts that have been assembled with removable thread lockers can usually be disassembled with hand tools and a little effort.
Preassembled materials such as carburetors, instrumentation or electrical connectors commonly use breathable quality threadlocker. These formulas gradually penetrate to seal and protect welds or porous metals. Breathable threadlockers also require heat to remove.
A thread locker can be an essential to your everyday home repair needs. Whether it’s used for hydraulic bushings, auto or motorcycle repair, toys, electronics, or other uses, a thread locker can come in handy many times. This product generally comes in small bottles in quantities of 8.5 fluid ounces (about 250 mL) or less. It is available at automotive, hardware, plumbing, and home improvement centers. Some larger grocery chains may also contain light formulas.
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