To provide secure locking of swinging cell doors, under conventional key control. Additional “privacy” locking mechanism to provide a level of privacy and security for the cell occupant, the privacy function can always be overridden by the staff key. The lock can be configured to provide a softer aesthetic appearance without reducing security.


Secure locking is achieved as follows:

Staff Key
Locking/unlocking is achieved by a full turn of the key allowing the handle to throw or withdraw the bolt. When the key is withdrawn the main bolt can be left in two positions fully thrown (i.e secure when door in frame) or bolt fully withdrawn and locked back. Withdrawal of the main bolt will automatically withdraw the prisoner’s 'privacy' bolt if thrown.

Privacy Key
The 'Privacy' bolt can be locked/unlocked from outside by a pin tumbler cylinder or from inside by a cylindrical knob.
Note: Locks can be prepared to accept customer’s choice of cylinder, details of which need to be supplied prior to ordering.


Solid Case Technology; Lock case machined from single piece carbon steel.

Steel main bolt, with carbide anti-cutting rollers and 32mm throw.

External visual locking status indication.

Independent 7-lever locking mechanism.

Factory restricted key sections.

Integral baffle arrangements to resist interference via the keyhole.

Privacy facility using secondary mechanism.

Internal knob with clutch mechanism to ensure staff always have control of lock

Escutcheon designed to give positive key alignment.


Mechanical locking mechanism tested to a minimum of 100,000 operations.

Handle mechanism tested to a minimum of 100,000 bolt operations.

Additional Features

Range of furniture options available.

Range of fixings including gatebox, locking plate and keep.

Can be keyed to the existing CLCS 4L range of cell locks.

External handle designed to shear under excessive load to prevent damage to internal lock mechanism.

Interchangeable mechanical inner locking unit to enable re-coding.

Can be configured to differ, to pass or under a master key scheme.

Gate boxes for steel door applications recommended

Materials and Finishes

Lock case - carbon steel electro-plated.

Main bolt - carbon steel electro-plated.

Main bolt follower - high tensile brass.

Keys – hardened steel

Levers and springs – brass/ phosphor bronze.

Inside knob stainless steel as standard, other materials on request.

Total Range

The lock is available in left or right hand variants and can be fitted to steel or wooden doors. For wooden door applications CLCS recommend a minimum door thickness of 54mm.

Fully dimensioned customer drawings are available on request to assist with door preparation.