J-B Weld Threadlockers provide a reliable and superior lock and seal for threaded fasteners. Ideal on all mechanical parts, body assemblies, and hundreds of other applications to prevent loosening of fasteners from shock and vibration. J-B Weld Perma-lock High Strength Threadlocker is ideal for heavy-duty applications requiring resistance to severe shock and vibrations. Heating and hand tools are required to separate parts. Great for: rocker arms, stud bolts, frame bolts, fasteners and bushings, loose screws, vibration sensitive items and more. OEM (Original Equipment Manufacturer) approved.