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1900 Series Nightlatches Deadlocking nightlatch featuring a latchbolt which is retracted by a series of cylinders and/or turnbuttons. No handle mechanism. Each latching function is deadlatched by an auxiliary bolt on closure of door. Latchbolt 14mm standard latchbolt (19mm anti-friction bolt available) Special Keying Each locking function can be specially keyed in a Gainsborough 6 pin tumbler system to meet the needs of commercial or residential building requirements. Locks can be keyed alike, master keyed, grand master keyed, maison keyed and project keyed. Product Illustration Description Back Set Cat No#. Nightlatch Cylinder and turnbutton Key retracts latch from outside Auxiliary bolt deadlatches when door is closed 60mm, 90mm, 127mm 19CA Communicating Nightlatch Double Cylinder Key retracts latch from both sides Auxiliary bolt deadlatches when door is closed Non handed 60mm, 90mm, 127mm 19CC Cylinder Nightlatch (Cylinder Outside) Cylinder Outside Key retracts latch from outside Auxiliary bolt deadlatches when door is closed 60mm, 90mm, 127mm 19CO Cylinder Nightlatch (Cylinder Inside) Cylinder Inside Key retracts latch from inside Auxiliary bolt deadlatches when door is closed 60mm, 90mm, 127mm 19OC Exit Nightlatch Turnbutton inside Turnbutton retracts latch from inside Auxiliary bolt deadlatches when door is closed 60mm, 90mm, 127mm 19OA