Smart Lock Measurement and Compatibility Guide

THE most important part of buying a lock

You want to be happy with your Smart Lock purchase and we want you to be happy with your purchase. Please take your time to read the following information and take the measurements twice to be sure.

How to Choose the Correct Mortice Lock

Tip: If you are replacing an existing lock, measure from the edge of the door to the centre of the hole that is already drilled.

Common Latches & Mortices

Adjustable Single Latch: 60 - 70mm - Typical Australian style latch

Adjustable Deadbolt: 60 - 70mm

Adjustable Roller Latch Deadbolt: 60 - 70mm

6068: 60mm Backset / 68mm Pitch - High Security. Used primarily on Entrance Doors

3585: 35mm Backset / 85mm Pitch - Sliding Door Mortice, Dual Hook

5050: 50mm Backset / 50mm Pitch

Not sure which lock body you need? Use this calculator to measure your door and find the perfect fit.

Mortice Types

Armstrong Smart Access Mortice Size Guide

Enter your measurements to find the correct mortice and ensure fitment.

ℹ️
Backset Measurement

Distance from door edge to centre of handle/keyhole.

ℹ️
Pitch Measurement

Distance from centre of Handle to centre of Keyhole/Turnpiece.

Understanding the Terms

1. The Backset

This is the most critical measurement. It is the distance from the edge of your door to the exact centre of your handle (or the keyhole).

Most Australian homes are 60mm or 70mm.

2. The Mortice

Think of this as the "engine" of the lock. It is the metal box hidden inside your door that the latch pops out of.

If you choose the correct size above, you can often swap your old lock for a smart lock without drilling any new holes.

A correct backset measurement ensures your new lock covers the old holes perfectly.

Still unsure? Don't guess. Take a photo of your current lock tape-measure held against it, and email it to us at support@smartaccess.au. We'll help you to pick the correct one.