ASSA 237 Hookbolt lock


ASSA 237 is a hookbolt lock designed for doors with narrow frame profiles; Patio, Balcony and sliding doors, bar gates in commercial buildings, private homes and other environments.

With installed micro-switch, the lock can be used with the advantage of alarms and security systems.


  • The lock has 9-tumblers in brass.
  • At 360 degree key-turn occurs automatic deadlocking, the deadbolt reaches 22 mm in locked position.
  • To complicate the sawing and breaking the deadbolt is hardened and steeled.
  • The hook bolt gives an extra strong bond between the door and frame.
  • The lock is away -safe which means that the key can be used from both inside and outside.
  • The lock complies with  the requirements according to Swedish Standard SS 3522, Issue 4, Class 3 TR 29.


Standard version

  • Lock is in galvanized steel.
  • Supplied with 3 keys in brass, reinforced nylonbange. Overall length 78 mm.
  • The lock case is prepared for micro-switch kit.
  • Holes for long plate with four through-going screws.
  • Level tumbler in brass.
  • Hardened hook bolt that obstruct the cut.
  • Drill protection.

Special version   

  • The Keys are in galvanized steel. Available in lengths of 68, 80, 90, 125 mm.
  • Key Alike with all of ASSA 9-tumbler lock.
  • Installed micro-switch for use in alarm and security systems. 
  • Asymmetrical locking.

Do you want to create a safe lock environment?

ASSA OEM has created "The lock guide by ASSA OEM", and it's made to give you knowledge and tips about approved lock sets. We really encouring poeple to read our tips and guidelines here: The lock guide

Want to download our product catalogues?

If you prefer to download our product catalogue - you can download it here
We also provide instructions, declarations and other documents in our download documents section.

Check it out!