The Loctite 221 is designed for the locking and sealing of threaded fasteners which require easy disassembly with standard hand tools. The product cures when confined in theabsence of air between close fitting metal surfaces and prevents loosening and leakage from shock and vibration. Particularly suitable for applications such as adjustment of set screws, small diameter or long engagement length fasteners, where easy disassembly is required without shearing the screw. Low viscosity