4L65 - Mechanical Cell Lock


To provide secure locking of swinging cell doors, under conventional key control where a lock back facility is a requirement.

The 4L65 is a surface mounted lock of robust construction based on the Chubb Lock Custodial Services standard cell lock footprint. The main bolt is an un-sprung rectangular deadbolt providing of throw of 32mm. Variants of the lock allow for mounting on or flush with the door skin.

Secure locking is achieved as follows:

  • Locking/unlocking is achieved by a partial 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 When the key is withdrawn the main bolt can be left in two positions fully thrown (i.e secure when door in frame) or bolt fully withdrawn and locked back.



  • 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 section.
  • 5 bolt secure fixing.
  • 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.
  • Saw attack 12 hours
  • End load 13.5 kN
  • Side Load 25 kN

Additional Features

  • Range of furniture options available.
  • Range of fixings including backplates, stud fixings, locking plate and keeps.
  • 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 or to pass.
  • Main Bolt and Inner Locking Unit can have monitoring facility.

Total Range

  • The lock is available in left or right hand variants and can be fitted to steel or wooden doors. A range of backplate stud lengths is available to suit door thicknesses from 25 to 70mm.
  • Fully dimensioned customer drawings are available on request to assist with door preparation.

Dimensions & Weights

Case Height286mm
Case Length267mm
Case Thickness29mm
Bolt Throw32mm
Bolt Depth45mm
Bolt Thickness22mm
Weight (lock only)12kg



  • Lock case - carbon steel electro-plated and powder coated exterior.
  • Main bolt - carbon steel electro-plated.
  • Main bolt follower high tensile brass.
  • Keys - Hardened Steel
  • Levers and springs - Brass / phosphor Bronze.