Nightlatches Yale has a comprehensive range of nightlatches suitable for all applications and security needs, including locks to meet BS 3621 & BS 8621. Yale's long standing history and experience in the manufacture of nightlatches means that the locks are commonly referred to as "Yale locks". BS1/BS2 - BS3621 Maximum Security Nightlatch BS3/BS4 Emergency Escape BS8621 Nightlatch P1 / P2 Double Locking Nightlatch X9 - Safety Handle Nightlatch 85/89 - Deadlocking Nightlatch 77 - Traditional Nightlatch 706 - Traditional Nightlatch Y3 - Contemporary Nightlatch 81 - Rollerbolt Nightlatch 82 - Deadbolt Nightlatch 84/88 - Standard Nightlatch 91 - Basic Security Nightlatch P334 - Rim Lock P401 - Rim Lock P402 - Rim Lock P405 Rim Knob