Permatex Red High Temperature Threadlocker is OEM specified. High temperature/high strength threadlocker for heavy-duty applications. Prevents fasteners 5/8\" to 1\" (16mm to 25mm) from loosening due to shock, severe vibration and heat stress. Advanced formulation for high performance and heavy-duty applications that operate at higher temperatures. Protects threads from corrosion. Suited for temperatures up to 450°F (232°C). Removable with heat and hand tools.