Auslock Ultra Slim S31B — Smart Lock for Hinged Doors
The Auslock Ultra Slim S31B is the only model in the Auslock range built from SS304 stainless steel and rated to IP66 — making it the right choice for hinged swing doors where weather exposure, condensation, or coastal salt-air would degrade an aluminium panel over time. With a 280 mm × 38 mm panel, it is the slimmest profile in the range and fits narrow aluminium door stiles that cannot accommodate wider escutcheons. Confirm your longplate mortice door preparation before ordering.
The S31B provides five access methods — fingerprint, PIN code, RFID card, Bluetooth app, and mechanical key — managed via the Auslock App. Remote access, voice control, and real-time notifications are available via the optional G2 or G3 Gateway. The door type compatibility matrix covers which smart locks suit which door types. Available in Silver, Black, Gold, Grey, and White. For the sliding door version, see the S31B Sliding Door.
If your door has a narrow frame or tight stile, explore our range of slim profile smart locks for narrow frame doors.
In-stock orders typically dispatch within 1–2 business days from our Gold Coast warehouse.
Key Features
- SS304 stainless steel construction — every external component: body panels, battery cover, and cylinder cover plate. The only stainless steel model in the Auslock range; all others use aluminium or zinc alloy
- IP66 rated — dust-tight and protected against powerful water jets; the only Auslock model rated for direct outdoor exposure. See corrosion resistance grades for what this means coastally
- Ultra-slim 38 mm panel — fits narrow aluminium door stiles from ~38 mm; most smart lock panels are 70 mm+ wide
- Latch/bolt mortice for hinged swing doors — spring latch and deadbolt engage a strike plate in the door frame; multiple mortice backset options available
- Fingerprint sensor — up to 200; permanent or timed. Keep sensor dry and clean for outdoor use
- PIN code — up to 150; permanent, timed, one-time, custom, or recurring. Permanent codes must be used within 24 hours of creation
- RFID card/tag access — up to 200 cards; 3 RFID tags included
- Widest temperature range in the Auslock range — −30 °C to 60 °C
- Suits aluminium, timber, and UPVC hinged doors; 35–75 mm door thickness
- Field-reversible lever handle — independently adjustable on both panels. Note: the panel arrow must point in the same direction as the handle after adjustment — see FAQ
- USB emergency power port — connect a power bank if batteries are flat
- 4 × AA alkaline batteries — not included; low-battery alert below 4.5 V
- 5 finishes — Silver, Black, Gold, Grey, White
SS304 stainless steel and IP66 are the strongest specifications in the Auslock range for resisting salt-air, moisture, and direct rain on the exterior panel. For sheltered exterior entry doors (interior face protected) this is the correct model. See coastal installation realities and corrosion resistance grades.
Available Finish Options
Silver
STK AUSS31B-Hinged
Black
STK AUSS31B-Hinged
Gold
STK AUSS31B-Hinged
Grey
STK AUSS31B-Hinged
White
STK AUSS31B-Hinged
All five finishes on this listing. Finish selection does not affect functionality, compliance, or performance.
Sliding vs Hinged Mortice — Which Version Do I Need?
The S31B uses the same panel hardware for both door types — the distinction is in the mortice body supplied. A hinged door uses a latch/bolt mortice: when the door closes, the spring latch and deadbolt engage a strike plate in the door frame. This is the standard configuration for residential swing doors. The bolt throw provides the locking engagement. A sliding door uses a completely different body — see the S31B Sliding Door for the hook mortice variant.
Mortice — Latch/Bolt (Hinged Door)
The S31B for hinged doors ships with a latch/bolt mortice — the standard configuration for swing doors. When the door closes, the spring latch and deadbolt engage the strike plate in the door frame. The compact 22 mm faceplate width fits narrow aluminium stile doors as well as timber. Multiple mortice backset options are available — see the Dimensions tab. Contact us if your door preparation requires a specific backset not shown in the dimensional drawings.
Auslock S31B Slim Series — Hinged vs Sliding
| Version | SKU | Mortice type | Door type | Backset options |
|---|---|---|---|---|
| S31B Hinged (This Product) | STK AUSS31B-Hinged | Latch/bolt mortice | Hinged swing doors | 28–76.5 mm (6 options) |
| S31B Sliding Door | STK AUSS31B-Slider | Hook mortice | Sliding doors | 28 mm or 35 mm (custom available) |
Panel hardware, access methods, finishes, app platform, and all other specifications are identical between the two versions. The only difference is the mortice body supplied.
Access Methods
| Method | How It Works | Gateway Required? |
|---|---|---|
 Fingerprint |
Touch sensor — up to 200; permanent or timed. Fingerprint tips. Keep sensor dry for outdoor use. | No |
PIN Code |
4–8 digits + # — up to 150; permanent, timed, one-time, recurring. See PIN guidance. Permanent codes must be used within 24 hours. | No |
 RFID Card / Tag |
Tap card or fob — up to 200; 3 RFID tags included; permanent, timed, or recurring. | No |
 Bluetooth App |
Auslock App (iOS and Android) — within ~5 m; share e-keys, view history. | No |
 Remote App (Wi-Fi) |
Lock/unlock from anywhere; real-time notifications; remote credential management. | Yes — G2 or G3 (sold separately) |
 Backup Key |
Mechanical override — 2 keys included; keep one outside the premises. | No |
What's in the Box
- Front panel assembly (touch keypad with fingerprint sensor) ×1
- Back panel assembly (interior, with battery compartment) ×1
- Mortice lock body (latch/bolt — hinged door) ×1
- Strike plate ×1; waterproof rubber plates ×2
- RFID key tags ×3; mechanical override keys ×2
- Square shafts ×2; spring ×1
- Sliding screws ×2; sliding screw casings ×3
- Fixing screws 1 ×3; fixing screws 2 ×4; pointed screws ×4
- User manual
Suitable Uses
Full Specifications
| Specification | Detail |
|---|---|
| Model | Auslock Ultra Slim S31B — Hinged Door |
| SKU | STK AUSS31B-Hinged |
| Lock type | Mortice smart lock — latch/bolt mortice for hinged swing doors |
| Material | SS304 stainless steel (all exterior components) |
| Finishes | Silver, Black, Gold, Grey, White (all on this listing) |
| Panel dimensions | 280 mm H × 38 mm W × 25 mm D |
| Overall width (with handle) | 134 mm |
| Backset | 60 mm standard; 6 mortice options 28–76.5 mm — see Dimensions tab. How to measure your backset. |
| Door thickness | 35–75 mm. See door thickness guide. |
| Suitable door types | Aluminium, timber, UPVC — hinged swing doors. See door type compatibility guide. |
| IP rating | IP66 (external panel) — dust-tight; jet water. See IP ratings explained. |
| Stile width | 38 mm panel fits stiles from ~38 mm wide |
| Lock weight | 2.5 kg |
| Fingerprint capacity | Up to 200 |
| PIN capacity | Up to 150 |
| RFID card capacity | Up to 200 |
| Connectivity | Bluetooth (local); Wi-Fi via Auslock G2 or G3 Gateway (sold separately, 2.4 GHz) |
| App platform | Auslock App (iOS and Android) — not TTLock, not Tuya |
| Voice control | Google Assistant, Amazon Alexa (requires gateway) |
| Power | 4 × AA alkaline (not included); low-battery alert below 4.5 V; alkaline only |
| Emergency power | USB port on front panel — connect a power bank if batteries flat |
| Operating temperature | −30 °C to 60 °C — widest range in Auslock range |
| Operating humidity | 20–90% |
| Reset procedure | Hold Reset button (battery compartment) 5 s, then enter 000# on keypad |
| Fire rating | None |
| Warranty | 12 months |
Dimensions
Confirm your door's backset, door thickness, and stile width before ordering.
Battery, Power & Backup
The S31B runs on 4 × AA alkaline batteries — not included. Alkaline only; lithium and rechargeable cells are not compatible. The low-battery alert fires below 4.5 V. For outdoor installations, battery drain accelerates in cold temperatures and high humidity — check more frequently. See what to expect from battery life in practice and Chapter 13 — battery and power FAQ.
Connect a USB power bank to the front panel port if batteries are fully flat. This temporarily powers the lock for PIN or fingerprint entry; it does not charge the batteries. Keep a power bank accessible outside the property for this scenario.
Remote App Access & Gateway
The S31B connects to the Auslock App via Bluetooth for local control. For remote access, real-time notifications, and voice control, an Auslock Gateway is required. Not sure if you need one? See do you need a gateway?
Auslock App
The S31B uses the Auslock App, available on iOS and Android. This is Auslock's own proprietary platform — not TTLock, not Tuya. Remote access requires an Auslock G2 or G3 Gateway.
Frequently Asked Questions
The external panel is IP66-rated and SS304 stainless steel — it handles direct rain, jet water, salt-air, and condensation on the exterior face. The IP66 rating applies to the external panel only. The interior unit (batteries) is not IP-rated — this is standard across all battery-operated smart locks. Not suitable for external pedestrian gates where the interior face is also exposed to weather. The McGrath Ascot is the only battery-operated digital smart lock in Terry's range confirmed for external gate use. See IP ratings explained, corrosion grades, and coastal installation realities.
Loosen the inner hexagon screw on the front panel counter-clockwise, remove the handle, reinsert in the correct position for your door handing, then retighten. Repeat on the back panel independently. Critical: the arrow moulded into the panel face MUST point in the same direction as the handle after adjustment. If the arrow is misaligned, the motor will drive the bolt in the wrong direction. See Chapter 12 — misalignment errors.
Permanent passcodes must be tested within 24 hours of creation, otherwise they auto-expire. Create the code, test it immediately, and it will remain active indefinitely.
Outdoor sensors face additional challenges: wet fingers, condensation on the sensor, and low battery voltage all degrade recognition. Keep the sensor clean and dry; wipe with a dry cloth before use if condensation is present. Delete and re-enrol at 2–3 different angles. Replace batteries — low voltage degrades sensor performance before the alarm fires. See fingerprint access tips.
Confirm AA batteries are inserted with correct polarity. Check the wire connection between front and back panels. Inspect the cable for kinks and confirm the cable hole is large enough per the installation template. See DIY install mistake 1 and mistake 2.
Additional Information
Register via the Auslock App while beside the lock; 4 scan presentations required; enrol at 2–3 different angles for reliability. For outdoor installs, register after the lock reaches ambient temperature. Monitor recognition — if it degrades, check battery voltage and sensor cleanliness before re-enrolling. See Chapter 03 — fingerprint access.
The S31B's 38 mm panel is narrower than any other Auslock model. Measure your door stile width before ordering — the panel must fit within the stile without overhanging the glazing or door edge. The screen door clearance guide covers the same measurement for security screen installations.
Confirm your door prep format before ordering. Apply lubricant to all mechanical moving parts at installation. Read the common DIY install mistakes before starting. For mortice-specific installs, see Chapter 12 — DIY suitability guide.
IP66 and SS304 address water ingress and corrosion, but electronic locks are not set-and-forget outdoors. Battery drain accelerates in cold. Keypad surfaces accumulate salt and grime. Fingerprint sensors degrade with moisture. Read the realistic maintenance expectation before installing outdoors. See also how coastal conditions affect smart lock lifespan.
Warranty
12 months from date of sale covering defects in materials and electronic components under normal residential use. Does not cover misuse, improper installation, or vandalism. Terry's Locksmiths manages all Auslock warranty claims — contact us first and we'll handle it from there. This warranty operates alongside your rights under Australian Consumer Law.
PDF Downloads
Auslock Ultra Slim S31B User Manual (PDF)
Auslock App User Manual (PDF)
Auslock Alexa Setup Guide (PDF)
Auslock Google Home Setup Guide (PDF)
Auslock 2026 Product Catalogue (PDF)
For all resources visit the Auslock PDF Resources page.
What's in the Box — Auslock Ultra Slim S31B (Hinged Door)
- Front panel assembly (touch keypad with fingerprint sensor) ×1
- Back panel assembly (interior, with battery compartment) ×1
- Mortice lock body (latch/bolt — hinged door) ×1
- Strike plate ×1; waterproof rubber plates ×2
- RFID key tags ×3; mechanical override keys ×2
- Square shafts ×2; spring ×1
- Sliding screws ×2; sliding screw casings ×3; fixing screws 1 ×3; fixing screws 2 ×4; pointed screws ×4
- User manual
Auslock Ultra Slim S31B — Dimensions
Auslock Ultra Slim S31B — User Manual
Auslock Warranty
All Auslock products purchased through Terry's Tradies Pty Ltd (trading as Terry's Gold Coast Smart Locks and its associated websites and subsidiaries) are backed by a 12-month limited manufacturer's warranty. If something isn't right, contact us first — we manage all warranty assessments on your behalf and will work with you to get it resolved.
Warranty Summary
How to Make a Claim
- Contact Terry's Tradies Pty Ltd at your original place of purchase with a description of the fault.
- Have your proof of purchase ready (receipt or order confirmation).
- Provide clear photos and/or video of the defect — this is required before any assessment can begin.
- We may ask you to complete troubleshooting steps or a technical support form before the item is returned. Do not send the product back without our written approval.
- If the claim is approved, we will arrange the next steps with you directly — including return freight where applicable.
What the Warranty Doesn't Cover
The following are not covered under the Auslock manufacturer's warranty:
- Incorrect or improper installation
- Door or frame misalignment
- Incorrect mortise, latch, or backset selection
- Installation on doors outside the product's specifications
- Environmental exposure beyond the product's stated IP rating
- Water ingress not consistent with the product's IP rating
- Power surge, fire, flood, lightning, or other natural disaster
- Cosmetic damage or normal wear and tear
- Battery misuse or leakage
- Forced entry, vandalism, or tampering
- Unauthorised modification
- Use of non-Auslock components
- Commercial or high-traffic use (unless approved in writing)
Rechargeable battery products (Models A01, A02, A03, A519, A619): Battery-related damage is excluded where a non-certified charger, fast charger, incorrect voltage (outside 5.2V / 2A), third-party battery, or unsuitable charging environment has been used.
Change-of-Mind Returns
Change-of-mind returns are accepted at our discretion and subject to the manufacturer's return conditions. If you've changed your mind, contact us within 14 days of receiving your order and we'll let you know if a return is possible and what applies.
To be eligible, products must be:
- Unused and uninstalled
- Not powered on, activated, paired, programmed, or configured in any way
- In original, fully sealed condition with all packaging, accessories, and components
Where a return is approved, a 20% restocking fee applies and return shipping is at your cost. Products that have been installed, powered on, or had any credentials registered are not eligible for return.
Australian Consumer Law
Our goods come with guarantees that cannot be excluded under the Australian Consumer Law (ACL). You are entitled to a replacement or refund for a major failure and compensation for any other reasonably foreseeable loss or damage. You are also entitled to have goods repaired or replaced if they fail to be of acceptable quality and the failure does not amount to a major failure. Nothing in this policy limits or excludes your rights under the ACL.
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