McGrath UltraSecua Digital Security Screen Door Smartlock - Black

At A Glance

At A Glance

DISPATCHSame Day Before 11am

LOCK TYPEScreen Door Mortice Smart Lock

FINISHMatt Black Only

IN THE BOXMortice, Strike, 2 Keys, 2 Tags, Batteries

WARRANTY24 Months

WANT CHEAPER?See Yale Unity - Screen Door Lock

WANT HIGHER SPECS?More Expensive - See Dual Unlock

SCREEN DOOR RANGEAll Security Screen Smart Locks

DOOR TYPEHinged Security Screen Only

DOOR THICKNESS19 - 30mm

TRIPLE LOCK KITSRod Kits Yes, Cable Kits No

HANDINGField Reversible L / R

PIN CODESUp to 250 Users

RFID TAGSUp to 1,000 Mifare

eKEYSUnlimited via App

REMOTE ACCESSOptional G3 / G4 / G5 Gateway

WEATHERIP66 External Housing

SALT SPRAY300h Black Finish

POWER2 x 3V Lithium, 36-48 Months

PASSAGE MODEHold Screen Unlocked

ANTI-PEEPScramble Digits Around Your PIN

WRONG-CODE LOCKOUT5 Tries = 35 Second Lockout

AUDIT TRAILIn the McGrath Locks App

DURABILITY300,000 Cycles

RETROFITWhitco, Austral, Doric, Lockwood

INSTALLLocksmith Recommended

APP SETUP FIRSTKeypad-Only Setup Blocks Bluetooth

REGISTERED DESIGNAU Design No. 202014467

UNLOCK WITH

PIN Code RFID Tag / Card McGrath Locks App Remote (Optional Gateway) Mechanical Key Fingerprint
Not Available

The McGrath ULTRA-SECUA is a digital smart lock built for one job: hinged aluminium security screen doors. It replaces the existing screen door mortice lock - the Whitco, Austral, Doric or Lockwood body already on the door - with a keyless unit that opens by PIN code, RFID tag or card, or Bluetooth through the McGrath Locks App, with a mechanical key as the fallback. It is one of a very small number of smart locks purpose-built for the narrow frames, multi-point locking bars and mesh-exposed interior handle that make a screen door different from a front door. This is the standard single-lock version - it secures the screen door on its own and does not pair with a main door lock. For one action that opens both doors together, see the ULTRA-SECUA Dual Unlock.

Out of the box the lock is controlled over Bluetooth when your phone is in range, or by the codes and tags you set up - no internet connection is needed for day-to-day use. Add an optional McGrath G5 gateway (sold separately) and the same app unlocks the screen door from anywhere, issues and revokes codes remotely and shows who came and went. What a gateway actually does - and whether you need one at all - is covered in our guides. The app itself is McGrath's Australian-supported build of the TTLock platform, the same system behind the rest of the McGrath range.

The lock ships complete: screen door mortice, strike plate, key cylinder, two keys, two RFID tags and the two 3V lithium batteries are all in the box. The external housing carries an IP66 rating and the black finish is tested to 300 hours of salt spray, which matters on the Gold Coast - read what coastal air does to electronic locks. Before ordering, do two things: check your screen door is 19 to 30mm thick, and measure the clearance between the screen and the main door - it is the mistake even experienced installers make.

Estimated Dispatch
Usually ships same day if ordered before 11am AEST (excludes weekends and Queensland public holidays).

Locksmith Installation Recommended
Fitting the ULTRA-SECUA is more involved than a standard door smart lock. The installer has to pick the right spindle for your door thickness (a 51mm spindle for 19-25mm doors, 57mm for 25-30mm), align the triangular hub marker correctly or the lock will not throw, and on a triple-lock screen may need to reverse the top and bottom lock components. Get any of those wrong and the door will not lock - the wrong spindle position is the most common DIY smart lock fault we see. Terry's recommends professional installation for this product. For our supply and install service see Site Survey and Installation Services, or book a free site survey if you are not sure your door suits.

Triple-Locking Screen Doors - Read This First
The ULTRA-SECUA suits single-point and multi-point hinged security screen doors. On some existing triple-lock kits the top and bottom locks - including the plastic adaptor - need to be reversed so the kit locks from the inside by lifting the ULTRA-SECUA interior handle upwards. Skip that step and the multi-point bars will not operate. The bigger question is what links your kit: rigid rods work, flexible cables do not - see the cables vs rods rule and how to identify your kit type. Brand-specific notes cover Austral, Whitco Tasman MKII and Lockwood kits. If your existing kit is an Austral Elegance, the Austral Elegance rod adaptor is the part that makes it fit. If the kit is beyond saving, removing the triple kit and running single-point is a practical alternative.

Set Up With the McGrath Locks App First - Not the Keypad
The ULTRA-SECUA can be programmed two ways: through the McGrath Locks App, or by keying codes straight into the keypad using the printed instructions. If you program the lock from the keypad first, you cannot add a Bluetooth device afterwards - the phone pairing path is closed off and the lock stays keypad-and-key only until it is factory reset. McGrath states this plainly on the user guide and we see it at the counter. Register the lock in the app before you do anything else: how the TTLock platform works, the 24-hour passcode activation rule every new owner trips over, and the TTLock app manual for the full menu walk-through. If the lock has already been keypad-programmed, the reset sequence is in the Pass 3 troubleshooting notes on this page.

Want the screen door and front door to open together? That is the Dual Unlock model.
This listing is the standard ULTRA-SECUA - it secures the screen door on its own. The ULTRA-SECUA Dual Unlock adds a Bluetooth pairing feature so that unlocking the screen door also unlocks a compatible McGrath main door smart lock in the same action - see how the pairing works. Same hardware, same mortice, same install. For a plain-English explanation of what Dual Unlock actually does, who it suits and how the McGrath approach differs from Yale DualDoor, read the guide. Every screen door option we stock is in the hinged security screen category.

Fitting a smart lock to the main door too?
Aluminium front doors behind a security screen usually have a narrow stile. Our slim-profile smart locks are built for those frames - check the stile width first, then browse the range.
View all slim-style smart locks for narrow frame doors

Access Methods

Four ways in, plus a key. For a side-by-side comparison of how each credential type behaves - and fails - see Chapter 03 - Smart Lock Access Methods. The six TTLock passcode types (permanent, timed, one-time, cyclic, custom and erase) are explained in Chapter 14, and the activation window that applies to each is tabulated in TTLock Tips. Browse every lock we stock by credential: PIN code, fob and card, Bluetooth, Wi-Fi and backup key.

Access Method	Availability	Notes
Keypad / PIN Code	Yes	Up to 250 user codes, 4 to 9 digits. The 4-digit minimum applies when codes are set in the app; codes entered at the keypad itself must be 6 digits or more. Permanent, timed, one-time, custom and recurring (cyclic) codes. Anti-peep: pad your code with random digits before or after it.
RFID Tag / Card	Yes	13.56 MHz Mifare (S50 and S70); up to 1,000 credentials, each individually revocable. Permanent, timed or recurring. Two tags included; add cards, fobs, wristbands or stickers from the RFID credentials range.
Bluetooth App	Yes	Bluetooth 5.0 BLE to the McGrath Locks App (iOS 7.0 / Android 4.3 and above). Unlimited eKeys - timed, permanent, one-time or recurring - shared to family, guests or trades from your phone. Works locally with no internet; see how eKeys work.
Wi-Fi Remote Access	Optional	No Wi-Fi in the lock. Add a G3 (PoE), G4 (4G backup) or G5 (dual-band Wi-Fi) gateway for remote unlock and management. What changes when a gateway is added.
Mechanical Key Override	Yes	Cylinder and two keys supplied. Keyhole sits under a rubber cover at the base of the exterior unit - where the keyhole hides, and why the override key must live outside the house.
Fingerprint	Not Available	No fingerprint reader on this model.
Palm Recognition	Not Available	Not supported on this model.
Face Recognition	Not Available	Not supported on this model.

Key Features

• Purpose-designed for hinged aluminium security screen doors, single-point and triple-locking - the security screen door detail in Chapter 04 explains why most smart locks cannot do this job.
• Screen door mortice lock, strike plate, key cylinder and two keys are all in the box - one purchase replaces the whole lock, not just the handle.
• Interior handle is designed so it cannot be operated through a damaged fly screen - the vulnerability that makes a standard screen door lock easy to defeat.
• Independent screen door access - locks and unlocks on its own with no pairing to another lock. If you want it to open the main door too, see the Dual Unlock version.
• PIN keypad, RFID tag or card, Bluetooth eKey and mechanical key override - 250 codes, 1,000 RFID credentials and unlimited eKeys.
• Anti-peep PIN entry: type random digits before or after your real code and the lock still opens, so anyone watching cannot learn it.
• Wrong-code lockout: five failed attempts locks the keypad for 35 seconds. During the lockout the door can still be opened from the McGrath Locks App.
• Passage mode holds the screen door unlocked while you are gardening or carrying groceries in - enter a valid code then press 1 2 3 # within five seconds; unlock with a code or card to cancel it. Passage mode set from the app must be cancelled from the app.
• Bluetooth local control as standard; add an optional G5, G4 or G3 gateway for remote unlock and management from anywhere.
• Full access log in the McGrath Locks App - who opened the screen door and when. Useful for rental dispute resolution.
• Reset Button Disable - the physical reset button on the exterior unit can be locked out in the app so nobody can wipe the lock from the outside.
• Field-changeable handing - loosen one screw and rotate the interior handle 90 degrees for a left or right hand door. No handed version to order.
• Two spindle lengths in the box (51mm and 57mm) cover screen doors from 19mm to 30mm thick.
• IP66 rated external housing - dust tight and resistant to high-pressure water jets. The interior unit houses the batteries and is not weather rated.
• Black finish tested to 300 hours neutral salt spray - see what corrosion grades mean and the Queensland salt air note.
• Durability tested to 300,000 lock cycles.
• Powered by two 3V lithium batteries (included) with a 36 to 48 month typical life. Exact replacement cells are stocked.
• Australian Registered Design No. 202014467. Supported and warranted in Australia by McGrath Locks through LSC, a century-old security distributor.

What's in the Box

Everything supplied with the ULTRA-SECUA. The mortice lock, strike plate and cylinder are included - you are not buying a handle set that needs a separate lock body.

Note: the G5 gateway and the Austral Elegance triple-lock adaptor are not included and are sold separately.

Suitable Uses

• Hinged aluminium security screen doors - single-point and rod-based triple-locking designs, 19 to 30mm thick. Check the door type compatibility matrix if you are unsure what you have.
• Retrofit over an existing Whitco, Austral, Doric or Lockwood screen door mortice - identify what is on the door now with Chapter 02 - existing hardware, and avoid the clearance mistake before you order.
• Homes where the screen door is the door people actually use - keyless entry for the family with the main door left on its existing lock, or paired with a narrow-stile smart lock on the aluminium front door behind it.
• Rental and short-stay properties where guests, cleaners and trades need time-limited screen door codes and the owner wants an access log - see the two approaches to short-stay access and how TTLock automation works for Airbnb.
• Coastal and exposed homes - IP66 external housing and 300-hour salt spray rated black finish. Read the Gold Coast coastal note before fitting any electronic lock near the beach.
• Home offices and light-commercial front screens where remote access is wanted - add a gateway and browse all app-enabled and Wi-Fi capable smart locks.
• Buyers who want the screen and front door to open in one action should choose the ULTRA-SECUA Dual Unlock instead - this standard model does not pair.

Not suitable for
Sliding screen doors - the ULTRA-SECUA is a hinged-door lock; for sliders see the sliding door category. Cable-linked triple-lock kits - rods only. External pedestrian gates - the interior unit is not weather sealed; for a gate use the McGrath Ascot or browse the external gate category. Fire doors - no fire rating; see the fire door category.

Available Finish Options

• 
  Matt Black
  (This Product)
  STK MLULSBKWM

The ULTRA-SECUA Standard is supplied in Matt Black only. Finish selection does not affect functionality, compliance, or performance. The Dual Unlock model is also Matt Black. If you need a silver screen door lock, the Yale Unity Security Screen Door Lock is stocked in Silver.

ULTRA-SECUA Range - Standard vs Dual Unlock

This product (bold row) is the Standard model. Both models share the same lock body, mortice, spindles, batteries, IP66 housing and install procedure - the Dual Unlock adds the pairing feature and nothing else. The products that offer dual unlock in Australia, and how the McGrath and Yale approaches differ, are compared in the guide. The other purpose-built screen door smart lock we stock is the Yale Unity Security Screen Door Lock (Yale Home app, key-free, Silver or Matt Black); for a glass or tempered screen the McGrath Kedron fingerprint deadbolt is the alternative.

Accessories and Spares

Every part and add-on we stock for the ULTRA-SECUA, in one place. Consumables and servicing items first, then credentials, then the remote-access gateways. All are McGrath Locks genuine parts, supported through LSC's Australian supply chain.

Which gateway? G3, G4 and G5 compared, or choosing the right gateway in Chapter 14. More McGrath parts are in the gateways and bridges, RFID credentials and other smart lock accessories categories.

Installation and Compatibility

• Designed for hinged aluminium security screen doors. Not for sliding screens - see the sliding door category instead.
• Retrofits most Australian screen door mortice formats - Whitco, Austral, Doric and Lockwood. Work out what is on the door now with Chapter 02 - existing hardware; the mortice vs cylindrical door prep explainer is the same chapter.
• Door thickness 19 to 30mm. Two spindles are supplied: 8 x 8 x 51mm for 19-25mm doors, 8 x 8 x 57mm for 25-30mm doors. Measure first - how to measure door thickness.
• Three-step fit: install the mortice in the existing cutout and fit the strike plate to the frame; install the cylinder and fix it with the supplied screw; fit the exterior and interior assemblies, tighten the two fixing screws and press in the rubber plugs.
• The triangular marker on the lock hub must be correctly aligned or the lock will not throw - it is the first thing to check if the door will not lock, and one of the three most common DIY mistakes.
• Triple-locking screens: rod-linked kits only, and the top and bottom locks (with the plastic adaptor) may need reversing. Full guidance in Understanding Triple Lock Kits and brand-specific notes. McGrath's own installation videos are linked from the same guide.
• Check the clearance between the security screen and the main door before ordering - the exterior unit projects further than the lever it replaces. The measurement that matters and Chapter 02 - screen door clearance.
• Door alignment matters as much as the lock. A screen that drags or springs will strain the motor and flatten batteries - the most underestimated factor. Not sure whether to DIY? When DIY is appropriate and when it is not.

Handle Direction Adjustment

The ULTRA-SECUA suits both left-hand and right-hand opening screen doors and is changed over with a screwdriver - there is no handed version to order. Not sure which hand your door is? How to determine your door's handing, and why the US and Australian conventions confuse people.

Loosen the interior screw, rotate the handle 90 degrees to the left or right, then retighten.

To change the handle direction:

1. With a screwdriver, loosen the inside screw on the interior assembly.
2. Rotate the interior handle 90 degrees to the left or right as required. The "A" mark on the spindle base must stay in the same direction as the handle.
3. Retighten the screw securely.

Confirm handing during installation. Ordering the wrong hand is not a risk on this lock, but it is on some others in our range.

ULTRA-SECUA - Technical Specifications

Dimensions

McGrath dimension drawing. Outside lock case 295mm H x 42mm W x 24mm D; outside handle projection 50mm; standard multi-point kit strike dimensions shown at right. Spindle selection by door thickness is in the installation guide; the full-width drawing is in the Dimensions tab.

Battery, Power and Backup Access

• Runs on 2 x 3V lithium batteries, supplied in the box. This is the one McGrath lock that does not take AA or AAA cells - order the McGrath 3V lithium replacement rather than reaching for a supermarket pack.
• Typical life 36 to 48 months depending on how often the screen door is used. What really drives battery life - alignment and drag matter more than the number of unlocks.
• Low battery warning at 4.8V: the lock beeps each time you wake the keypad and the McGrath Locks App flags it. Replace both cells together and never mix old and new - monitoring and choosing batteries.
• If remote unlock stops working before the keypad does, that is usually the batteries, not your Wi-Fi - reading a low-battery fault correctly.
• Mechanical key override gets you in if the batteries are flat. The keyhole is under the rubber cover at the base of the exterior unit - what to do when the battery dies, and keep the override key outside the house.
• Codes, cards and app users are held in the lock and survive a battery change. Only a deliberate factory reset clears them.
• The battery cover is held by a triangular recessed screw; the mini security screwdriver is in the box, and the full-size McGrath Torx screwdriver is the replacement tool. The interior unit that houses the batteries is not weather sealed - keep it dry.
• No mains power involved, so a blackout changes nothing at the door - what actually happens in a power outage. More on power in Chapter 13 - Power and Battery FAQs.

Wi-Fi Remote Access (Optional)

App Platform and Data Hosting

The McGrath Locks App is a McGrath-branded build of the TTLock platform, tailored to the McGrath range and managed, supported and distributed in Australia by McGrath Locks. Warranty claims, app troubleshooting and platform questions are handled by Australian-based staff - you are not dealing with an overseas vendor. The underlying cloud infrastructure is provided by TTLock, a globally deployed access-control platform. The app is available for iOS and Android. How TTLock compares with Tuya, Yale Home, Igloohome and Carbine Connect is laid out in Chapter 15 - choosing a platform; the platform's published security history is in Chapter 14 - security considerations.

Long-Term Support and Confidence
A screen door lock should still be working, and still supported, in ten years. McGrath locks are distributed by LSC, a century-old Australian security wholesaler, and installed and warranted locally by Terry's. Read why longevity matters more than features, why a globally proven, locally branded app is the safer bet, and what a realistic lifespan looks like for an electronic lock on the Gold Coast.

Frequently Asked Questions

Five questions buyers ask before ordering. The FAQ tab above carries the full owner's guide - setup, triple locks, codes, gateways and troubleshooting.

Will it fit my screen door?
Almost certainly, if the door is hinged aluminium, 19 to 30mm thick, and currently has a Whitco, Austral, Doric or Lockwood mortice lock. The two things that stop a fit are a cable-linked triple lock (rods are fine) and too little clearance between the screen and the main door. Check door compatibility and measure the clearance, or book a free site survey.

Can it be installed on a triple-locking security screen door?
Yes, if the kit uses rigid rods. Cable-linked kits are not compatible. On rod kits the top and bottom locks and the plastic adaptor usually need reversing so the kit locks by lifting the interior handle. This is the part that trips DIY installers - cables vs rods and why we recommend a locksmith here. Austral Elegance kits also need the rod adaptor.

What is the difference between this and the Dual Unlock model?
Same lock, same install. This Standard model secures the screen door on its own. The Dual Unlock adds a Bluetooth pairing feature so that opening the screen door also opens a compatible McGrath main door lock in one action. If you have, or plan to fit, a McGrath lock on the front door and want one code for both, buy the Dual Unlock. What Dual Unlock actually does and what it does not do.

Does it need internet or a gateway to work?
No. Codes, tags and the app over Bluetooth all work with no internet. A gateway is only needed if you want to unlock or manage the lock when you are away from home - what changes when a gateway is added. If you do add one, the G5 is the one to buy for a normal home - gateway choice explained.

Can I set it up from the keypad instead of the app?
You can, but do not. If the lock is first programmed from the keypad using the printed codes, Bluetooth pairing is closed off and the lock stays keypad-and-key only until it is factory reset. Register it in the McGrath Locks App first, then use the keypad as an everyday credential. See the setup warning above, the TTLock app manual, and the 24-hour passcode rule that catches most new owners.

Additional Information

Installation complexity
This is one of the more involved smart lock fits we do: spindle selection by door thickness, hub alignment, and on triple locks the component reversal. Get one wrong and the door will not lock - the symptom is nearly always a handle that turns but a bolt that does not move, which is DIY mistake number one. Terry's recommends professional installation - our supply and install service, and why Gold Coast customers trust Terry's.

Screen door clearance - check before ordering
The exterior unit projects 50mm from the door face. If the gap between your closed screen and the main door is tighter than that, the lock will foul or the main door will not close. Measure the projection of the lever on the door now and compare - the measurement that matters. The same check applies before pairing a Dual Unlock.

Outdoor exposure - external housing only
The exterior housing is IP66 rated: dust tight and resistant to high-pressure water jets, which suits a screen door that takes weather. The interior unit, which houses the battery compartment, is not weather rated and must stay dry. That is why this lock is not suitable for an open pedestrian gate; use the McGrath Ascot there. Plain-English IP ratings are in Chapter 11.

Coastal installations
The black finish is tested to 300 hours neutral salt spray, which is a genuine coastal-grade result for a screen door lock. It is still an electronic device metres from the surf: rinse the exterior with fresh water occasionally, keep the battery compartment dry, and read why coastal Queensland is not gentle on locks and how corrosion grades are measured.

Where this sits in the McGrath range
The ULTRA-SECUA is McGrath's only screen door lock. For the aluminium front door behind it, the slimline A231 and A210 share the same app and gateway. For a glass or tempered screen, the Kedron deadbolt is the alternative. The whole range is profiled in Chapter 10, and how it compares with the other platforms for a residential home is in the platform guide.

Warranty
12-month warranty against defects in materials and workmanship (24-month on ALBION, ASCOT, ASHGROVE, BARDON, GRANGE, HAMILTON, KEDRON, MANLY, SANDGATE, STAFFORD, ULTRA SECUA and WINDSOR models). McGrath Locks will repair, replace, or refund at their discretion. Proof of purchase required for all claims. Returns & Warranty | McGrath Locks Warranty

Download PDF Resources

ULTRA-SECUA Product Brochure (PDF)
Six-page McGrath brochure: access types, security features, the current technical specifications table, what's in the box and dimension views. The authoritative spec source for this model.

ULTRA-SECUA User and Installation Guide (PDF)
Two-page guide. Page one: keypad programming codes, passage mode, anti-peep, lockout, low battery, reset and demo mode, and the app-first setup warning. Page two: exploded diagram, handing change, spindle selection, three-step install and the triple-lock reversal note.

ULTRA-SECUA Exploded View Diagram (PDF)
Single-page component diagram naming every part of the exterior and interior assemblies - useful when talking to Terry's about a service part.

ULTRA-SECUA Technical Sheet - Earlier Edition (PDF)
McGrath's original seven-page technical sheet with description, system specification table, programming and installation instructions. Some capacity figures in this earlier edition have since been revised - the brochure above carries the current specifications.

TTLock Platform App User Manual (PDF)
The 56-page platform manual behind the McGrath Locks App: registration, adding a lock, eKeys, the six passcode types, card management, Bluetooth unlocking and gateway setup. Skip the fingerprint section - this lock has no reader. Also available as a web page.