Locktite is a brand name of a company that makes a range of adhesive chemicals. The name locktite has become synonymous with a family of chemical adhesives called threadlockers. At threadlocking compound is a chemical that is used in place of mechanical locking devices. It is primarily used on the threads of mating bolts and nuts.
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How do threadlockers work?
The threadlocking compound is an anaerobic liquid. Is applied drop-wise to the threads of a fastener and cures to a hard thermoplastic that locks the threads together. This prevents unwanted movement, loosening, leaks and/or corrosion. Threadlockers are available in many unique formulations developed for applications with high temperatures, oil contamination and less active surfaces.
What are the different formulations of threadlockers?
Threadlockers have historically been formulated as liquids due to their reactivity. In liquid form they remain stable and ready for use. Recent breakthroughs have led to the development of stable, semisolid stick formulations. This has opened the door to applications where the liquids were considered too messy or inconvenient. The new semisolid formulations allow direct contact of the anaerobic product to the part. The product can be placed exactly where it is needed and it stays in place as the threaded part is positioned and assembled.
What are the advantages of Threadlockers?
Threaded fasteners continually receive various types of differential stress. Stress such as vibration and shock, thermal expansion and contraction and micro-movement of the fastened parts. Any and all of this can reduce clamping force and ultimately cause machine failure. Many mechanical devices such as spring washers, wire retainers and locking bolts were developed to prevent uncontrolled loosening of fasteners. These locking methods add substantial cost to the fastener assembly, yet cannot reliable prevent loosening due to the uneven side or sliding motion and must be sized appropriately for the specific fastener.
Threadlockers are available in low strength formulations for easy removal, medium strength grades that are removable using common hand tools and high strength grades that offer strong holding abilities. Even the highest strength threadlocker is not completely permanent and can be removed with common hand tools following direct exposure to a heat of 450-500F degrees for about five minutes. Contrary to common belief, any bolt previously locked with threadlocking adhesive is reusable simply by removing the old adhesive, applying new threadlocking material and reassembling.
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