3M50 - 5 Detainer Mortice Hook Bolt



  • Either for timber door hinged on left or right or sliding doors
  • Keys suitable for doors up to 50mm thick
  • Provides a higher number of key combinations than lever locks


  • Deadbolt and hookbolt is locked or unlocked by key from either side
  • The hook bolt clutches the lock to the frame, whilst a steady bolt engages with the strike and prevents the door being lifted to release the hook
  • Force resistant, anti-pick and anti-saw security features
  • Available with square forend and striking plate
  • Supplied with a pair of stainless steel key plate escutcheons
  • Case Size: 70mm
  • Backset:  43mm
  • Case: Gold powder coat 
  • Forend: Painted gold
  • Box Strike Assembly: Painted to match forend
  • Deadbolt: One hook and one square dead, both brass
  • Keying Groups: Standard differ, to pass or masterkeyable with other detainer locks
  • Keys supplied: Standard differ supplied with 2 keys.  For locks to pass or master keyed please specify number of keys required
  • Key Blank Number: B-K521-S
  • Cut Key Number: B-DET-STD (Standard Differ)


  • GT - Simulated Brass


  • EN 1634-1 assessed for use on 60 minute timber fire doors
Ordering Options
5 Detainer Hook Bolt Mortice Lock