3R47 - Morticed Latch Lock



To provide secure locking of swinging cell doors, under conventional key control from the corridor side where automatic latching and deadlocking using a key is a requirement.


The 3R47 is a morticed sprung latch bolt lock of robust construction based on the Chubb Locks Custodial Services small mortice footprint. The latch bolt provides an overall throw of 20mm. The lock offers a number of keying and handle configurations to suit a variety of operational requirements and is fitted with an external visual indicator.

Secure locking can be achieved as follows:

Single Locking Action -Keyed to pass or to differ

  • Locking is achieved by inserting the key into the keyhole and rotating fully. This action will both deadlock the latchbolt and lock the handle in position.
  • Unlocking is achieved by inserting a key into the keyhole and rotating fully. This action will release the latchbolt and unlock the handle. The latchbolt is then withdrawn using the handle.

Double Locking Action

Singles Key - Operates single locking action only

  • Locking / Unlocking as above.

Note the Servant key will not operate the double locking action.

Doubles Key - Operates double locking action

  • Locking, providing the singles key has been used to operate the first locking action, the master key can be utilised. By inserting the doubles key into the keyhole and rotating fully over-locking will be achieved. The singles key will be disabled and unauthorised use of the singles key will be prevented.

  • Unlocking is achieved by inserting the doubles key into the keyhole and rotating fully, this action will remove the over-locking enabling operation of the singles key.

Note: the lock can be configured to operate the double locking action only or if required to operate both single and double locking actions from a single key.




  • Carbon steel latchbolt, with carbide anti-cutting rollers and 20mm throw.
  • 7 lever highly durable mechanism.
  • Configurable to three key options - Single Action (1 key), Double Action (1 key) or Double Action (2 keys).
  • Dedicated key profile operates 3R47 range of locks only.
  • Tamper resistant Aluminium fascia plate with status indicator.
  • Security fixings to prevent unauthorised removal.


  • Lock tested to a minimum of 100,000 key operations.
  • Handle operation tested to 300,000 operations.
  • Latch action tested to 150,000 operations.
  • Saw attack 30 minutes
  • End load 13.5 kN
  • Side Load 13.5 kN

Additional Features

  • Optional inner handle available on request.
  • Suitable for internal use only.
  • Available in alternative furniture finishes on request.
  • Gate boxes for steel door applications recommended.

Total Range

  • The lock is available in left or right hand variants for opening in or opening out doors and can be fitted to steel or wooden doors. For applications requiring cell side furniture a range of options are available on request.
  • Lock is suitable for use on all door types, however on steel doors the short forend version should be ordered and for wooden doors the long forend version is recommended.

Dimensions & Weights

Lockcase depth171.5mm
Lockcase length114.2mm
Lockcase width21.0mm
Weight (lock only)3.0kg