Loctite 277 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. - Loctite 277 large bolt high strength red threadlocker locks fasteners up to 1-1/2 Inch (36 mm). Protects threads from rust and corrosion. Removable with heat and hand tools.