McGrath Ultra Secua & Triple Lock Kits – What Works, What Doesn’t & Installation Advice
Posted by Mat Steele on 10th Feb 2026
McGrath Ultra Secua & Triple Lock Kits
What works, what doesn’t — and when professional installation matters
The McGrath Ultra Secua is a purpose-built smart lock designed specifically for hinged security screen doors.
Confusion often arises when pairing it with an existing triple (3-point) locking system. While the Ultra Secua is compatible with many triple kits, not all kits are created equal.
Door Compatibility (Read Before Installing)
Designed For
- Hinged security screen doors
Not Compatible With
- Sliding screen doors
- Sliding glass doors
- Hinged glass doors
Understanding Triple Lock Kits
A triple (3-point) system secures a hinged screen door at:
- Centre lock
- Top locking point
- Bottom locking point
Ultra Secua Compatibility
Cable-Based Kits ❌
Generally not compatible. Cables rely on tension rather than positive mechanical engagement.
Rod-Based Kits ✔
Typically compatible when installed and adjusted correctly. Rods provide the rigid push-pull movement the Ultra Secua requires.
Brand-Specific Installation Notes
Austral Triple Kits
- Cable-based – Not compatible
- Rod-based – Compatible when installed correctly
Whitco Tasman MKII
The Whitco Tasman MKII triple kit is a known compatible option, however it is not a simple bolt-on retrofit. In many cases the top bolt must be reversed, changing its position and requiring strike relocation and door modification.
Lockwood Triple Kits
With many Lockwood triple kits, the entire assembly must be removed and reinstalled as one complete unit in reverse, including rods, bolts and plastic connection components. This results in the top latch relocating to the bottom cut-out and the bottom latch relocating to the top cut-out. Door removal, drilling, cutting and strike relocation are commonly required..
Important
These retrofits are not simple DIY installations. Professional locksmith installation is strongly recommended.A Practical Alternative
In many homes, the simplest and most reliable solution is to remove the triple kit entirely and install the Ultra Secua as a single-point lock.
- Simpler installation
- Fewer moving parts
- Excellent real-world security
Helpful Installation Videos
Frequently Asked Questions
Is it suitable for sliding doors?
No. It is designed exclusively for hinged security screen doors.
Can I keep my triple lock?
If rod-based, usually yes. If cable-based, no.
Will door modification be required?
Often yes — drilling, cutting and strike relocation are common.
Unsure what triple system you have?
Send us photos before purchasing and we’ll identify it for you. For triple lock installations, professional fitting ensures proper alignment and long-term reliability.
Bottom line: Rod-based triple kits can work well with the Ultra Secua. Cable systems won’t. When in doubt — get it installed professionally.