Loctite 266 is a surface insensitive, high strength, high temperature anaerobic threadlocking material which cures when confined in the absence of air between close fitting metal surfaces and prevents loosening and leakage of threaded fasteners. The thixotropic nature of Loctite 266 reduces the migration of liquid product after application to the substrate. Particularly suitable for heavy duty applications such as bolts used in transmissions, construction equipment or railroad assemblies where resistance to heavy shock, vibration and stress level is required along with exposure to elevated temperatures. Loctite 266 is tolerant of oil and other mild surface contamination.