What is the difference between single and triple lock?

Choosing the right lock for your screen door So, you’re about to buy security screens for your house, and you need to decide between a single lock or a triple lock […]

Choosing the right lock for your screen door

So, you’re about to buy security screens for your house, and you need to decide between a single lock or a triple lock system for your doors. If you are not sure which one is the best option for your house this will help you to decide.

Do you already know the right option for your house? Then contact us on 07 3272 2974 to get a free quote. If you need more information keep reading this post.


When choosing security screens for your home you need to know what the security/safety rating that your premises require. If you don’t know yet read our section on Understanding Security Screens and learn more about their different characteristics.

To summarize, there are 3 different grades, which are:

  1. Safety,
  2. Barrier and
  3. Security grade

Each one of them has a different lock system that is suitable to fit in with the rating specification. When you buy a specific security grade screen from Starline Security, we ensure the product will be customised to your needs, from the screens to the locking system.


When you buy safety grade screens the doors will have a single lock. These screen doors are made to be a physical obstacle. Whether it is for additional safety when opening your front door, protecting you from insects or keeping your pets and kids safe a Safety grade door does it all.

If you are leaning towards Safety Grade doors choose from these types: Diamond Grille, Basix, SecureView, Xceed and Colonial Castings.



Barrier grade screens are specified with triple locks resulting in the installation strength increasing significantly over Safety grade screens and doors. They are an excellent option when you want to step up the level of security in your house.  We also believe that most triple lock “security screen doors” sold in Australia are actually Barrier grade because, without further information, most clients tend to compare on price and a triple lock barrier grade door is the most economical and affordable triple lock door available.

If you are leaning towards Barrier Grade doors they are again available in these types: Diamond Grille, Basix, SecureView, Xceed and Colonial Castings.



Security Grade Products offer the highest level of security for your window and door screens. They are installed with a quality Lockwood Triple Lock (put a link to download the official Lockwood 8654 or 8653 brochure) with a 5 pin cylinder.

They are made to pass the following Australian Standards:

This grade has makes no compromises in terms of strength, security, and functionality. Including, but certainly not only, a strong and safe triple lock for the screens.

If you are leaning towards Security Grades choose from these types: Diamond Grille, SecureView or Xceed.

Colonial Casting doors can be upgraded to Security Grade but only when a SecureView or Xceed Security Grade screen is incorporated into a Colonial Castings door.



Now that you know the different grades available, it will be easier to understand the characteristics of each lock that goes with them. Starline Security provides three different options depending on the security grade. Here are their characteristics:



Single lock doors only have one central lock, which is generally located in the middle of the door just above or below your main door lock.

Its mechanism allows you to close and open the door safely from inside without using the key. Nevertheless, it’s necessary to use a key to lock and unlock the door from outside.

The mechanisms we use are dependant on the doors system you have, which can be:

Generic Whitco Leichhardt

We install a generic “Whitco Leichhardt” lock in our single lock sliding doors. Either left or right-hand closing and they have a key deadlock from both sides and are self-latching. Another feature is the inside snib (small handle that allows you to lock the door from inside), but using the key overrides and deadlocks the snib operation.

Generic Whitco Tasman Mk3

We install a generic “Whitco Tasman MK3” lock in our single lock hinged doors. they provide the option of choosing privacy-lock or deadlock when exiting the property. They also suit left or right-hand opening hinged security and screen doors.


When choosing the triple lock system, your screen doors will have a three-point locking system installed inside the door frame. This means that added to the central lock, there are two additional locking tongues located towards the top and bottom of the door. Those extra locks are connected internally and once you activate the main lock, the other two will automatically do the same. Genius.

Triple Lock

This mechanism also allows you to lock the door from inside without using a key, but when opening and closing the door from outside it’s necessary to use the key.

Because it provides lockage at three points of the door it provides you with a significant improvement in security. Sure, they are more expensive than single locks, but when you are aiming for a higher safety level for your premises it’s worth investing in this system.

The locks we use for triple lock doors are the same as the single lock doors: Generic “Whitco Leichhardt” locks for sliding doors and generic “Whitco Tasman MK3 locks for hinged doors.


Lockwood Logo

In Security Grade Doors we install a Triple lock provided by Lockwood. We’ve chosen to use Lockwood Locks in our security grade products because Lockwood offers innovative and intuitive design, high-security products and guaranteed quality.

Its mechanism is similar to the triple lock for Barrier grade. However, they are stronger than the ones previously mentioned because they meet all the Australian Standards for Security grade.

These locks contain two-stage key locking, which gives a choice of selecting a privacy lock or deadlock when exiting your home. When turning the key to the first section it engages the safety lock. This allows whoever is inside to safely exit using the internal lever and snib. By turning the key to the second section, it engages the secure lock, and a key is required to unlock the door from inside and outside.

In sliding doors, we install a “Lockwood Lock 8653”. Check pictures below:

Lockwood Lock 8653 2

In Hinged doors, we install a “Lockwood Lock 8654”. Check pictures below:  

Lockwood Lock 8654

Click here to Download the Lockwood Security Screen Door Hardware Catalogue.

We hope this information helped you to decide the type of locking mechanism you need for your screen doors. If you need more information to decide which is the best security screen or door read the post How to choose the right Security Screen Mesh for your home.

Get in touch with us to get a free quote for Security screen:

  • This field is for validation purposes and should be left unchanged.

If you have any questions or would like more information about the different screen types, please contact us. Call 07 3272 2974.

Google Rating