4L65P - Mechanical Cell Lock With Privacy Facility


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 4L65P 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.

  • Locking/unlocking is achieved by a partial of the key and handle operation to throw or withdraw the bolt. On withdrawing the key the main bolt will be automatically left locked in the position chosen (i.e. fully thrown or unlocked). Withdrawal of the main bolt will automatically withdraw the occupant's 'privacy' bolt if thrown.
  • Under Occupant's Key - The occupant's 'Privacy' bolt can be locked/unlocked from outside by a keyed cylinder lock or from inside by a handle or knob.



  • 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.
  • 5 bolt secure fixing.
  • 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.
  • 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 Thickness30mm
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.
  • Inside knob Stainless Steel