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“Commercial mortice lock, cylinder below lever” describes a door-hardware layout, not a complete product specification. The keyed cylinder sits below the operating lever on the door furniture, but the Architecture & Design listing does not identify an exact model, lock function, cylinder format, dimensions, handing or compliance rating. Treat it as a configuration description and obtain the supplier’s product code, technical drawing and installation template before ordering or cutting a door.
The listing names Gainsborough Architectural as supplier. Its visible information is not enough to establish which Gainsborough lock family is shown, whether it is in stock, or whether it will replace an existing lock without modification.
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What is a commercial mortice lock with the cylinder below the lever?
A commercial mortice lock is a lock case recessed into the edge of a door. The case normally contains the latch mechanism and, depending on its function, a deadbolt or other locking components. Exterior furniture—such as a lever, roses or escutcheons—and a keyed cylinder operate the case through the door.
In the configuration described by the listing, the cylinder is positioned below the lever. The cylinder is the part that accepts a key; the lever is the handle used to retract the latch. This placement can help identify the general arrangement when looking at a product image, but it does not tell you how the lock operates or whether it fits a particular door.
The Architecture & Design entry for Commercial mortice lock, cylinder below lever names Gainsborough Architectural and provides enquiry and brochure routes. The extracted overview does not provide a model number, case dimensions, backset, door thickness range, cylinder type, function or performance certification. Those omissions matter: two locksets can look similar while requiring different door preparation and providing very different access behaviour.
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1Fix the driver behind crashes, sound loss and screen glitches2Repair Windows errors before they cause bigger problems3Scan for outdated or missing drivers - takes under a minuteWhat does the listing identify—and what does it leave unknown?
It identifies a supplier and a relative component layout. It does not identify a particular series that can safely be ordered from the title alone.
| Information | Status from the listing | Why you need it |
|---|---|---|
| Supplier | Gainsborough Architectural | Provides a starting point for documentation and reseller enquiries. |
| Configuration | Cylinder below lever | Describes visible positioning only. |
| Exact model or product code | Not stated | Required to obtain the correct template, cylinder and replacement parts. |
| Lock function | Not stated | Determines whether the door is passage, privacy, classroom, storeroom, exit, corridor or another type. |
| Dimensions and preparation | Not stated | Needed to check backset, spacing, holes, case depth and door thickness. |
| Availability | Not confirmed | Stock and current range can change by reseller and location. |
Do not infer a Taymor, Gainsborough or any other model from the photograph or title. Ask for the current product code and the manufacturer’s technical documents.
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How does the cylinder-and-lever arrangement work?
The cylinder and lever are parts of a complete lock system rather than interchangeable decorative pieces. A typical commercial mortice set may combine:
- a mortice case recessed into the door;
- a latchbolt that holds the door closed;
- an optional deadbolt or other locking element;
- lever trim and roses or escutcheons;
- a cylinder and keyway; and
- strike hardware fitted to the frame.
Turning the lever normally retracts the latch. Turning a key may lock or unlock the outside trim, throw a deadbolt, or change the outside lever’s behaviour, depending on the function. A cylinder below the lever therefore says nothing by itself about whether the inside lever always allows exit, whether the outside lever is locked, or whether a key is required to enter.
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Repair Windows errors before they cause bigger problemsFix Now →Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Clear out junk files and repair common Windows errorsFree Scan →For a documented commercial example, the Taymor 3900 Series catalog describes a commercial mortise program with a fully wrapped 12-gauge steel case, field-reversible handing and a stainless latchbolt with 3/4-inch projection. It lists a standard six-pin Schlage C-keyway cylinder in 1-1/8-inch and 1-1/4-inch lengths for applicable functions. These are specifications for that Taymor series, not for the Gainsborough configuration in the listing.
Which lock function should you choose?
Choose the required access behaviour before selecting trim or cylinder. Commercial catalogs commonly distinguish functions such as passage, privacy, classroom, storeroom, exit, dormitory and apartment or corridor. The names indicate how the outside lever, inside lever, key and locking device interact.
- Passage: intended for free passage; typically no keyed locking function.
- Privacy: used where occupants need temporary privacy, such as a bedroom or bathroom, rather than controlled key access.
- Classroom: allows an authorised key to control the outside lever while keeping normal egress behaviour inside.
- Storeroom: generally keeps the outside lever locked and requires a key for entry, while the inside lever provides exit.
- Exit: prioritises immediate egress from the secure side and may be paired with other access-control requirements.
- Dormitory or apartment/corridor: uses a defined combination of outside locking, inside operation and key control.
Function names vary by manufacturer. Confirm the exact operation in the selected series’ function chart, and check local building, fire and accessibility requirements where the door is part of an egress route. Do not assume that a cylinder-below-lever arrangement is suitable for a fire door, security door or accessible opening without project-specific approval.
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Will this layout fit an existing door?
Only a model-specific template can answer that reliably. Check all of the following before removing the existing lock or drilling new holes:
- Door thickness: verify the permitted thickness range and whether the supplied spindle, screws and cylinder length match it.
- Backset: measure from the door edge to the lock centerline and compare it with the new case.
- Case size and depth: the mortice pocket must accommodate the case without weakening the stile.
- Cylinder and lever spacing: confirm the vertical center-to-center dimension and escutcheon footprints.
- Door handing: determine whether the opening is left- or right-handed and whether the case can be reversed in the field.
- Edge and frame preparation: check the faceplate, strike, latch projection and frame reinforcements.
- Cylinder format and length: verify the keyway, single- or double-cylinder arrangement and projection through the trim.
A Taymor commercial mortise technical drawing illustrates why these measurements must be verified. That drawing shows a 1-1/4-inch cylinder hole, a 1-inch lever hole, a 2-3/4-inch backset, a standard 1-3/4-inch door thickness and 3-5/8 inches (92 mm) between the cylinder-hole centerline and lever reference centerline. It is a reference drawing for that product family, marked not to scale, and instructs installers to use the product installation template before preparing the door. Do not transfer any of those dimensions to the Gainsborough listing.
What should you ask the supplier before ordering?
Send the supplier a concise request that forces the unknowns into the open. Include the door type, thickness, existing backset and a photograph of the edge and both faces if appropriate. Ask for:
- the exact manufacturer model and product code;
- the current data sheet, function chart and installation template;
- available cylinder type, keyway, length and single- or double-cylinder options;
- case dimensions, backset, lever-to-cylinder spacing and door-thickness range;
- handing requirements and whether the case is field reversible;
- compatible lever trims, finishes, strikes and cylinders;
- any fire, accessibility, security or compliance documentation relevant to the project;
- current availability, lead time, warranty and replacement-part support; and
- the name of an authorised local reseller or installer.
Request written confirmation that the proposed set will replace the existing preparation. A visually similar escutcheon can conceal a different spindle position, case depth or cylinder length.
Where can you source a Gainsborough mortice lock in Australia?
Gainsborough’s official Australian information says the brand does not sell directly to consumers and directs buyers to hardware resellers through its Where to buy service. Its FAQ also describes a network of more than 1,000 Australian hardware resellers, a brand-published distribution figure rather than evidence about this particular lock.
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The official mortice-lock category shows that Gainsborough offers single- and double-cylinder options within its product range. That does not prove that the exact “cylinder below lever” configuration is currently stocked. Ask a reseller to verify the model code, finish, cylinder arrangement and lead time rather than searching by the descriptive title alone.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How should the lock be installed?
Installation should follow the chosen model’s instructions and template. The general sequence is:
- Confirm the model, function, handing, door thickness and template before marking the door.
- Isolate the door and remove the existing furniture without enlarging holes prematurely.
- Mark the case pocket, cylinder hole, lever hole, faceplate and strike from the supplied template.
- Cut or machine the mortice and through-holes to the template’s dimensions, keeping the faces square and avoiding damage to the door stile.
- Fit the case and faceplate, then install the cylinder, spindle, levers and trim in the specified order.
- Align and secure the strike so the latch and any deadbolt enter freely without forcing the door.
- Test the lever return, latch engagement, key rotation, locking function and inside egress with the door open.
- Close the door and repeat the tests, checking that seals, hinges and frame alignment are not loading the latch.
A separate CaviLock CL100 fitting guide demonstrates the principle of lining up cylinder and case holes and checking handle movement, latch return and key operation. It is a different lock family and application, so use it only as an illustration of why the exact product guide controls the installation.
What are the common mistakes and fixes?
- Ordering from the title alone: stop and obtain the model code and function chart.
- Reusing old hole dimensions: compare the new template; fill or reinforce unsuitable preparation rather than forcing the trim.
- Choosing the wrong cylinder length: confirm door thickness and trim stack-up; excessive projection can interfere with operation, while insufficient length may not engage the thumbturn or retaining screw.
- Ignoring handing: check the lever return and latch bevel; reverse or replace the case only as the manufacturer permits.
- Testing only with the door open: adjust the strike and frame alignment, then test closed to ensure the latch is not binding.
- Assuming a keyed lock meets egress rules: have the function reviewed for the building’s fire, accessibility and security requirements.
- Mixing components from different families: use only cylinders, trims and cases listed as compatible by the manufacturer.
How should you compare candidate locksets?
Once you have identified a real model, compare candidates in this order:
- Required function and safe egress. Eliminate sets whose access behaviour does not match the opening.
- Door fit. Match thickness, backset, case dimensions, spacing, handing and template.
- Cylinder system. Confirm keyway, length, security-pin or master-key requirements and single- or double-cylinder layout.
- Trim and finish. Select a lever style and finish actually offered for that series.
- Supply and support. Check reseller stock, lead time, warranty, replacement parts and installation assistance.
This order prevents appearance or finish from driving a decision before the lock can be safely and legally fitted.
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What is the bottom line for this Architecture & Design listing?
The phrase “commercial mortice lock, cylinder below lever” is useful for describing the visible arrangement, but it is not an orderable specification. The listing does not establish the exact Gainsborough model, function, dimensions or availability. Obtain the product code and current template from Gainsborough Architectural or an authorised Australian reseller, then verify function, cylinder, door preparation, handing and compliance before purchasing or machining the door.
Frequently Asked Questions
Is “cylinder below lever” the same as a single-cylinder lock?
No. It describes the cylinder’s position relative to the lever. A lock can have a single cylinder, double cylinders or another approved cylinder arrangement while retaining that layout; the exact model documentation determines which option is available.
Can I replace an old mortice lock using the existing holes?
Only after comparing the old preparation with the new manufacturer template. Backset, case depth, cylinder-to-lever spacing, door thickness and strike position can differ even when the escutcheons look similar.
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How do I tell whether I need a storeroom, classroom or passage function?
Describe who must enter, how the outside lever should behave when locked, and how occupants must exit. Then match that requirement to the chosen manufacturer’s function chart; names and operating details are not universal across brands.
Where do Australians buy Gainsborough commercial mortice hardware?
Gainsborough’s Australian support pages direct purchasers to hardware resellers rather than direct consumer sales. Use the official reseller locator, then ask the reseller to confirm the exact model code and current stock for your project.
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