What’s the difference between a single lock and a triple lock?

When selecting your security screen door hardware, it’s important to know what the difference is between a single lock and triple lock and what impact each has on a security door.

  • A single lock is has one locking point at the centre of one side of the door.
  • A triple lock has three locking points connected to an internal rod, one at the top, one in the middle, and one at the bottom. All three locking points are engaged when the key is turned.

Which lock should I use on my security door?

It is important to note that a single lock does not meet Australian Standard AS 5039-2008: Security Screen Doors and Security Window Grilles and using a single lock will turn any security door into a barrier door, otherwise known as a safety door. Therefore, to maintain the integrity of your security screen door, it is essential to use a triple lock.

Triple locks are significantly more secure as opposed to a single lock for the simple reason that it locks at three points on the door jamb and can’t be levered at the top or bottom.

All three locking points are activated by either turning the snib, or by using a key. By turning the key you are able to deadlock the door.

Safety locking tips for security doors

The safest way to lock your security screen door from the inside is by using the snib. This activates all three locking points and ensures no one can break through the security door while you’re inside.


Using the key will deadlock your door and best used when you are leaving the house and locking up. If you need to rush out of the house in an emergency, it is quicker and safer to quickly turn the snib, than potentially look for the key to unlock the door.

But what if some leaves the house while others are inside?

When someone leaves the house and people are still inside, ensure when they use the key that they only turn it so they hear one click. This will activate the triple lock while ensuring the occupants inside can still use the snib. If they turn the lock completely and hear two clicks then they have activated the deadlock and occupants inside will need a key to unlock the door.

CommandeX’s range of Security Screen Doors are custom made and fitted to any door style and size. With the option of two security screen door systems, you can be confident in finding a security screen door to suit your home, security needs and budget. Click here to view our range of patented security screen doors.