Defines design requirements, test procedures and performance requirements for thief resistant locks operated by keys with mechanical patterns, meant for fixed mounting on hinged or sliding doors for provision of reasonable security against unauthorized entry. Provides for locks with claw or hook bolts, mounted on hinged or sliding doors, and for locks with spring or dead bolts of either single or multiple throw, mounted on hinged doors.

BS 3621(1980) : 1980

BS 3621(2004) : 2004