Series 120M Deadlatches are pin
tumbler, motor-operated electromechanical
locks for swinging doors.
Specify keying as follows:
121 Keyed case side
122 Keyed cover side
126 Keyed both sides
Standard (1): Series 120M locks unlock
when the motor is energized by a
momentary-contact switch. Once
unlocked, the latchbolt is held
mechanically retracted until the door is
opened. It then extends automatically.
Knob release(2): 120M Deadlatches
may be specified with knob release on
one side, where the knob is always
active. Knob may be mounted on the
case side, or the cover side.
Key holdback (3): When unlocked by
key, the deadlatch remains retracted
until relocked by turning the key in the
opposite direction. Available one side
only. This function is not UL Listed for
Fire Door Accessories to a three-hour
Note: Key cylinders for locks with key holdback
feature must be installed at the factory.
Series 120M Deadlatches are jambmounted
and designed for use in
medium or maximum security
applications to secure cell doors,
sallyports, corridors or entrance doors.
The motor provides smooth, quiet
operation and positive locking. 120M
locks are designed to be part of an
electrical system with remote operation
and monitoring. They afford flexibility
and safety to institution staff.
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