Temperature Resistant to 300°F
Ideal for ¼” to 1” fasteners
OEM Approved
No Spill, Drip, or Clog Cap
Use On
  • Automotive
  • Threadlockers
  • And More

Perma-Lock Red Threadlocker

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

Made in the USA US flag


Clean all threads (bolt and hole) with a cleaning solvent.
Shake the product thoroughly before use.
For thru holes, apply several drops of product onto the bolt at the nut engagement area.
Assemble and tighten as usual. When tightening to established torque values, torque compensation is not required.