Home > Companies > ASSA ABLOY Opening Solutions UK & Ireland > HD72LA - Heavy Duty Mortice Latch

Heavy duty mortice latch.

Features and benefits:

  • Features a European DIN style casing with 60 mm backset.
  • For use with sprung or un-sprung door furniture: heavily sprung latch follower allows for the use of heavy un-sprung door furniture (weighing up to 930 g per pair).
  • Positive 1° follower angle.
  • The latch follower technology has been successfully cycle tested to 3.5 million operations.
  • Quick reversible latch allows for easy on-site handing.
  • Spindle grip and adjustable strike features are provided to reduce door rattle.
  • Splinter guard provides a professional installation by hiding rough unfinished timber, and protects the lock from frame debris.
  • Two piece forend provides clean aesthetics and easy maintenance, with a removable front which allows the door to be painted without needing to mask off the lockface, while the plate also covers the lockcase retaining screws, creating an effective deterrent against tampering.
  • Easily reversible for right or left hand use.
  • Designed to deliver high performance locking for years.
  • Reliable and durable.
  • Contemporary design.
  • Reduces maintenance and replacement costs.
  • High corrosion resistance.
  • Part M compliant of the Building Regulations.
  • CE marked.
  • 15 year performance guarantee.


  • Fully tested to EN 12209: 2003, Grade 3 category of use.
  • Tested to EN 1634-1: 2014 on 30 and 60 minute timber fire doors and 240 minute metal fire doors.
  • Fulfils the requirements of the Equality Act by satisfying the recommendations of BS 8300: 2009, and Approved Document M: 2015 (2016).


For use in high frequency public areas or in areas with a high chance of misuse.

For 30 and 60 minute fire doors use 1 mm interdens behind the strike plate and 2 mm interdens around the lockcase.

Standard product features


  • Backset: 60 mm.
  • Follower: 8 mm.
  • Lockcase depth: 90 mm.
  • Height: 165 mm.
  • Forend (l x w): 235 x 24 mm.

Lockcase thickness:

16 mm.


  • Faceplate and strike: Grade 1.4301 (304) satin stainless steel.
  • Latch: Steel, chrome plated.
  • Case: Heavy duty carbon steel.
  • Splinter box: Black plastic.

Angle of lever operation:



Lockcase pierced to accept bolt through door furniture with 38 mm centres.

NBS Specification

NBS Create logo
This product is associated with the following NBS Create clause:
45-25-18/310 Door and window locks and latches

NBS Specification

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This product is associated with the following NBS clauses:

Product specification

An important note about specifying



ASSA ABLOY Opening Solutions UK & Ireland


+44 (0)1902 364120

Product reference

HD72LA - Heavy Duty Mortice Latch


Radius forend. For installation using CNC machinery.
Square forend. For on-site fitting.


[Antique brass (AB)]
[Polished brass (PB)]
[Polished chrome (PC)]
[Satin brass (SB)]
[Satin stainless steel]
As standard.

Manufacturer details

School Street,
West Midlands, WV13 3PW
Tel +44 (0)1902 364120
Fax +44 (0)1902 364000
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