Identify and Replace a Mortice Lock AU

Knowing how to identify and replace a mortice lock on an Australian timber, fire-rated, or commercial glazed aluminium door saves hundreds of dollars in joinery modifications. Unlike domestic cylindrical knobsets that fit inside a 54mm circular face hole, a mortice lock body slides into a deep rectangular pocket chiselled into the vertical leading edge of the door leaf. Because Australian commercial lock manufacturers standardise their primary lockcase footprints, you can swap a worn mortice body in under fifteen minutes once you verify four exact millimetre measurements.

Identify and Replace a Mortice Lock: The 4 Exact Measurements

To identify and replace a mortice lock without removing the entire door from its butt hinges, measure these four dimensions with a steel ruler:

1. Backset (Door Edge Faceplate to Centre of Spindle / Keyhole): Measure horizontally from the outer front surface of the stainless steel faceplate straight to the exact centre axis of the lever handle hub (or 570 oval cylinder). Standard Australian commercial timber and fire doors use a 60mm backset (with 89mm and 127mm extended backsets available). Narrow-stile glazed aluminium shopfront doors use a 23mm, 30mm, or 38mm backset.

2. Pitch Centres / PZ (Spindle Centre to Cylinder Keyhole Centre): Measure vertically from the centre of the 8mm square lever spindle hub down to the circular part of the 570 oval cylinder (or Euro cylinder). Australian commercial primary mortice locks share a standardised 64mm pitch centre, whereas residential Euro-profile mortice deadlocks typically use an 85mm pitch centre (and hinged security screen door locks like the Lockwood 8654 use bespoke screenfurniture spacing).

3. Case Depth, Height & Outer Faceplate Size: Standard 60mm Australian commercial mortice bodies measure 88mm case depth x 175mm case height x 19mm thickness, concealed behind a 240mm high x 25mm wide outer faceplate. Narrow-stile 23mm/30mm/38mm aluminium shopfront cases measure 39mm to 54mm total case depth x 175mm height.

How to Select the Correct Mortise Lock Body for Your Door Type

When tradespeople and property owners research how to select the correct mortise lock body, the decision is governed by whether the door swings on hinges or slides horizontally, and whether the frame is solid timber or extruded aluminium:

1. Hinged Solid-Core Timber & AS 1905.1 Fire Doors (60mm Backset Latching): Always specify a bevelled self-latching primary mortice lock (Lockwood 3572, Lockwood 3772, or Carbine CSM72) with a deadlocking auxiliary latch plunger. Never fit a non-latching deadbolt or hook lock to a designated fire door.

2. Narrow-Stile Aluminium Shopfront Hinged & Sliding Doors (23mm, 30mm or 38mm Backset): To select the correct mortise lock body for a narrow glass shopfront stile, verify both the backset (23mm, 30mm, or 38mm) and the bolt style: use a hinged short-throw bevelled latch (Lockwood 3582 / Lenlok C-702 Latch) for swinging doors, or a pivoted hook / claw deadbolt for sliding commercial doors.

Lockwood 3572 vs 3772 vs Carbine CSM72: Direct Drop-In Comparison

Evaluating a lockwood 3572 vs 3772 vs carbine csm72 shows why all three 60mm commercial mortice locks are 100% interchangeable inside the exact same 88mm x 175mm door pocket and 240mm x 25mm faceplate recess:

Side-by-Side Engineering Differences:
• Lockwood 3572 Synergy Series: Australia's traditional commercial benchmark. Handing (left vs right) is reversed by rotating the bevelled latch head, and locking functions (Vestibule, Classroom, Storeroom, Passage) are set by fitting the correspondingcam and turnsnib adaptor.
• Lockwood 3772 Selector Series: Upgrades the 3572 chassis by placing front-accessible function and handing selector switches directly beneath the outer faceplate, allowing you to switch between Vestibule (free internal egress at all times), Classroom, or Storeroom functions with a small screwdriver without removing the lock body from the door.
• Carbine Longreach CSM72 Series: A heavy-duty, 4-hour AS 1905.1 fire-rated direct drop-in replacement for the Lockwood 3572/3772 that accepts standard 570 oval cylinders and existing 64mm-pitch Carbine Serens or Lockwood 1800/2800 plates at outstanding trade value when comparing lockwood 3572 vs 3772 vs carbine csm72 pricing.

570 Oval Cylinder Cam Chart Australia (X, Y, V, W & Z Cams)

When replacing or keying a 570 oval cylinder inside an Australian mortice lock, consulting the 570 oval cylinder cam chart australia locksmiths use prevents ordering a barrel whose rear tail cam misses the internal locking bar:

Australian 570 Oval Cam Reference:
• X Cam (Standard Primary Latch & Deadbolt Cam): Standard cam fitted to single-cylinder and double-cylinder 570 barrels operating Lockwood 3572/3772, Carbine CSM72, and Lenlok C-702 primary mortice locks.
• Y Cam & V Cam (Vestibule & Hold-Back Functions): Used when pairing an external key cylinder with an internal turnsnib or classroom/vestibule function inside 3572/3582 cases.
• W Cam (Deadlock & Short-Throw Aluminium Series): Used across narrow-stile aluminium hinged and sliding mortice deadlocks according to the 570 oval cylinder cam chart australia standard.

Frequently Asked Questions

Can I swap a Lockwood 3572 for a Carbine CSM72 without chiselling new holes?

Yes. When you identify and replace a mortice lock with a 60mm backset, the Carbine CSM72 shares the exact 88mm x 175mm case dimensions, 240mm x 25mm faceplate, and 64mm spindle-to-cylinder pitch as the Lockwood 3572 and 3772.

How do I select the correct mortise lock body if my door has a smart lock?

To select the correct mortise lock body for a digital smart lock or Carbine CEL2/CDL7100 upgrade, check whether the electronic escutcheon uses a 60mm tubular latch (54mm face bore) or an 85mm/64mm pitch mortice case, and ensure 65mm handle clearance if fitted behind a security screen door.

Where can I order a replacement mortice lock keyed alike to my existing C4 key?

Order any mortice body and 570 C4 oval cylinder in our Commercial Mortice Locks category together with our Custom Keying Service (SKU: KA) so you can identify and replace a mortice lock with 24-48hr Victorian dispatch, or call (03) 9306 6760 / 0421 149 760.