To provide secure locking of swinging cell doors, under conventional key control where a lock back facility is a requirement. The lock can be configured to provide a softer aesthetic appearance without reducing security.


The 3F65 is a mortice lock of robust construction based on the Chubb Locks Custodial Services large mortice footprint. The main bolt is an un-sprung rectangular deadbolt providing of throw of 32mm.

Secure locking is achieved as follows:

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 When the key is withdrawn the main bolt can be left in two positions - fully thrown (ie secure when door in frame) or bolt fully withdrawn and locked back.


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

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

Independent 7-lever locking mechanism.

Factory restricted key section.

Integral baffle arrangements to resist interference via the keyhole.

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.

Optional external status indicator.

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.

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.