Loctite 272 is designed for the permanent locking and sealing of threaded fasteners. The product cures when confined in the absence of air between close fitting metal surfaces and prevents loosening and leakage from shock and vibration. Typical applications include the locking and sealing of large bolts and studs (M25 and larger). - Loctite 272 high temperature, high strength red threadlocker withstands temperatures to 450 °F. Provides a fast cure on most surfaces, including "as received" fasteners. Recommended for bolts up to 1-1/2 Inch (36 mm) in diameter. Heat and hand tools are required for disassembly.