Heavy Duty Morticed Latch
The 3R47 was introduced, at the request of the Home Office Prison Department, with the original
intention of providing secure locking of cell doors in Crown and Magistrates Courts, by means of a
lock that is essentially different to those used in UK prisons.
The latchbolt 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
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 The latchbolt is then withdrawn using the handle.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
Servant Key – Operates single locking action only Locking / Unlocking as above.
Note: the Servant key will not operate the double (master) locking action.
Master Key – Operates double locking action.
Locking - providing the servant key has been used to operate the first locking action, the master key can be utilised. By inserting
the master key into the keyhole and rotating fully over-locking will be achieved. The servant key will be disabled and unauthorised use of the servant key will be prevented.
Unlocking is achieved by inserting the master key into the keyhole and rotating fully, this action will remove the over-locking
enabling operation of the servant 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
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.
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.
Dimensions and Weights
Case Height 286mm.
Case Length 267mm.
Case Thickness 29mm.
Bolt Throw 25mm.
Bolt Depth 45mm.
Bolt Thickness 22mm.
Weight (lock only) 12.4Kg.
Short forend to suit steel doors / gates.
Long forend to suit timber doors.
Outer steel lock box for welding into steel doors / gates
Can be configured to differ, to pass or under a master key scheme.
Note - 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.