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Permatex® is a leading manufacturer of premium chemical products that technicians, OEM’s and Do-It-Yourselfers have trusted for over 100 years. Permatex® Threadlockers are widely accepted in a broad range of applications, from delicate fuel injection components to heavy duty transmission assemblies. Superior to conventional lock washers, nylon inserts, and other mechanical devices Permatex® Threadlocker seals threads and secures the entire fastener assembly against vibration or shock. Permatex® Threadlockers is simply the most reliable way to lock and seal threaded fasteners.