Introduction
The label 3585 smart lock mortise commonly refers to a mortise body with a 35 mm backset and 85 mm center distance. In many hardware catalogues, 3585 is a compact code for the two key centerline measurements: the spindle or follower sits 35 mm from the door-edge reference, and the cylinder center is 85 mm from the spindle center. That is the useful starting point, not a complete universal specification.
The same four digits can appear on products for sliding aluminum doors, narrow-stile doors, and some hinged wooden-door applications. Product listings may also use “85 mm pitch,” “85 mm PZ,” “35×85,” or a different order of dimensions. Before choosing a replacement or smart-lock panel, verify the exact drawing, reference surfaces, mortise body, door, frame, and electronic interface.
Principaux enseignements
- For the inspected 3585 references, the common reading is 35 mm backset plus 85 mm center distance or pitch.
- Some listings use 3585 as a family label, while others add a suffix for sliding-door, wooden-door, hook-bolt, or panel variations.
- The number pair does not define the entire case, faceplate, latch function, cylinder, spindle, fixing pattern, door thickness, strike, or smart-panel interface.
- 3585 is often associated with narrow-backset or sliding-door hardware, but the application must be verified for the exact model.
- Tuya, TTLock, Bluetooth, Wi-Fi, fingerprint, and keypad functions do not prove that a smart panel will mechanically drive a 3585 mortise.
- For a repeat project, approve the complete body-panel-door assembly on one representative door before a batch order.
What Does 3585 Mean on a Smart Lock Mortise?
In the common notation used by the inspected product references, 35 identifies the backset and 85 identifies the center distance, also called center-to-center, pitch, or PZ in different markets.
| Number or term | Common 3585 interpretation | What still needs confirmation |
|---|---|---|
| 35 | 35 mm backset from the stated faceplate or door-edge datum to the spindle center | Whether the supplier measures from the visible faceplate, door edge, or another reference line |
| 85 | 85 mm center distance between the spindle center and cylinder center | Whether the product uses a cylinder, a thumbturn position, a deadbolt center, or another opening |
| 3585 | A compact model or family label built around the 35/85 relationship | Case height, depth, faceplate, function, fixing holes, handing, and smart-panel compatibility |
A smart-lock mortice measurement guide identifies 3585 as a 35 mm backset and 85 mm pitch sliding-door mortice with a dual hook. An official ASSA ABLOY technical catalogue also lists narrow-profile 3585 lockcases with 35 mm backset and 85 mm center-to-center options. Those references support the common geometry, not a universal 3585 body or smart-panel fit.
How to Read the 35 mm Backset and 85 mm Pitch
Backset is the horizontal distance from the door-edge or faceplate datum to the center of the follower or spindle. A 35 mm backset places the operating center close to the door edge, which is why 3585 bodies are common in narrow-stile and compact-door applications.
Center distance is the vertical distance between the handle follower center and the cylinder or lock-opening center. An 85 mm pitch fixes the relative height of those two interfaces. It does not tell you how long the faceplate is, how deep the case is, or which cylinder and motor arrangement the lock uses.
When a supplier writes “85 mm backset,” “85 mm mortise,” or “35 mm width,” the wording may not match the usual 3585 notation. Some manuals describe a 35 mm case or lock-body width while using 85 mm for a different centerline. Ask the supplier to mark the two dimensions on a drawing and identify every datum.
Why 3585 Listings Can Disagree
Search results for 3585 are not one standardized catalogue. They combine mechanical lock bodies, smart-lock kits, sliding-door products, and generic instruction manuals. Several recurring sources of confusion deserve attention.
- Number order varies. One supplier may write 35×85, another 85×35, and a third may use 3585 as a family code without defining the order.
- Different products share the label. A hook-bolt sliding mortise and a hinged-door latch/deadbolt body can share a 3585-style centerline but have different cases and strikes.
- Marketing names are broader than drawings. “3585 smart lock” may describe a complete kit, while the replacement body is only one component in that kit.
- Measurement terms are translated inconsistently. Backset, case width, pitch, center distance, PZ, cylinder distance, and hole spacing should not be treated as synonyms without a diagram.
A smart-lock mortise instruction-manual family groups 2085, 2885, 3585, and 5085 bodies and describes different body widths around a similar product family. A separate 3585 sliding-door manual shows why application, door thickness, and handing must be checked separately. These references are useful for terminology and inspection questions, not proof that every 3585 product has identical dimensions.
Sliding Door or Hinged Door? Confirm the Application
3585 is frequently connected with sliding aluminum or narrow-stile doors because the 35 mm backset leaves limited space between the door edge and the operating center. Hook-bolt mechanisms are also common in sliding-door hardware. However, 3585-labeled bodies also appear in hinged or wooden-door smart-lock variants.
The application changes the fit audit. A sliding door may need a hook bolt, special strike geometry, clearance through an aluminum profile, and a reversible handle. A hinged wooden door may use a latch and deadbolt, a Euro-profile cylinder, a different faceplate, and a conventional frame keep. Do not transfer one application’s body, door-thickness range, or installation method to another.
| Application clue | Questions to verify |
|---|---|
| Sliding aluminum or narrow-stile door | Is the bolt a hook, latch, or another type? Does the body fit the profile pocket? Is the strike aligned when the panel slides fully closed? |
| Hinged wooden or composite door | Does the case fit the pocket? Are the latch/deadbolt and cylinder centers correct? Is the faceplate and strike compatible with the frame? |
| Existing smart-lock retrofit | Can the motor, spindle, cylinder adapter, cable, and panels operate the installed body without binding? |
What the 3585 Code Does Not Tell You
The 35/85 pair is only two coordinates in a larger mechanical and electronic specification. Confirm these items against the exact product drawing or a physical sample.
| Specification | Why it matters to a smart-lock project |
|---|---|
| Faceplate or forend | Width, length, thickness, corner radius, finish, and screw spacing determine whether the plate covers the edge cutout. |
| Lock-case envelope | Case height, depth, rear projections, cable clearance, and pocket dimensions determine whether the body enters the door. |
| Function and bolt movement | A hook, latch, deadbolt, roller, or multipoint mechanism requires different travel and motor behavior. |
| Cylinder and opening | Profile, cam position, cylinder length, thumbturn clearance, and emergency key override must match the panels and door. |
| Follower and spindle | Square size, spindle length, clutch behavior, free-handle operation, and handing affect both installation and electronic drive. |
| Fixing points | Mounting holes, through-bolts, posts, and screw locations may not match an existing door or smart panel. |
| Strike and frame | A body can fit inside the door while the latch or hook misses the keep, rubs, or fails to release. |
| Door thickness and panel clearance | Thickness changes spindle, cylinder, through-bolt, cable, battery, and exterior-reader dimensions. |
Use Four Fit Gates Before Ordering
Gate 1: Notation
Write down exactly what 35 and 85 mean on the supplier drawing. Mark the spindle center, cylinder center, faceplate datum, door-edge datum, and direction of measurement. If the quotation says only “3585,” request clarification before comparing prices.
Gate 2: Mortise body
Compare the full body: faceplate, case, latch or hook, deadbolt, cylinder opening, follower, fixing holes, rear clearance, handing, and bolt projection. A matching 35/85 relationship does not guarantee a matching pocket or strike.
Gate 3: Door and frame
Record the door material, thickness, stile width, edge preparation, frame reveal, existing strike, and flat surface available for the smart panels. For a sliding door, measure the closed-door position and profile pocket. For a hinged door, test the latch and deadbolt with the door open and closed.
Gate 4: Electronic interface
Match the motor, spindle or cylinder adapter, mounting posts, cable route, battery housing, emergency power, door sensor, and access-control platform. A product being listed as Tuya or TTLock does not establish mechanical compatibility with an existing 3585 body.
For field measurements, use the site’s how to measure a door for a smart lock guide. For thickness-specific checks, see smart lock door thickness. For clearance and installation review, see smart lock installation dimensions.
3585 Compared With Nearby Mortise Labels
The following comparison is a screening tool, not a universal standard. Each label still requires a complete drawing.
| Label | Common reading in the inspected product families | Why substitution is risky |
|---|---|---|
| 2885 | Often a 28 mm narrow-backset / 85 mm family reference | The operating center may move toward the edge and the case width may differ. |
| 3585 | 35 mm backset / 85 mm center distance | Confirm sliding versus hinged function, case envelope, and panel interface. |
| 2085 | Often a 20 mm narrow-backset / 85 mm family reference | The operating center may move 8 mm toward the edge and the case width may differ. |
| 3585 | Often a 35 mm narrow-body / 85 mm family reference | The body may be wider and require different pocket and faceplate preparation. |
| 4585 | Commonly 45 mm backset / 85 mm center distance | The handle and cylinder line shifts significantly compared with 3585. |
| 6085 | May identify a different 60 mm backset / 85 mm family | The edge distance and case geometry can be unsuitable for a narrow stile. |
Use the site’s smart lock backset article for the general concept, but keep this page focused on the 3585 label, the narrow-backset application question, and full compatibility approval.
Choose a Retrofit Route
Once the existing body is documented, choose the least risky route based on the interfaces you can actually prove.
| Route | When it makes sense | Evidence required |
|---|---|---|
| Keep the existing 3585 body | The body is sound and a documented smart panel or adapter matches its movement and mounting. | Follower or cylinder interface, motor travel, handing, fixing, panel clearance, strike alignment, and sample test. |
| Replace the mortise body only | The existing body is worn or unavailable, but the current smart panels and door preparation are reusable. | Full body drawing, centerline, case envelope, cylinder, follower, fixing, function, and electronic-panel interface. |
| Replace body and panels as a matched set | The old brand is unknown, the door population is repeated, or the electronic interface is undocumented. | Complete assembly drawing, door range, cable and battery clearance, strike, handing, and a representative sample approval. |
The most common failure is assuming that the 35/85 coordinates are enough, then discovering that the motor cannot complete the hook or latch travel, the panel does not sit flat, or the strike does not align. If the interface cannot be documented, a matched set is easier to validate.
Sample Approval Workflow for a 3585 Smart Lock
- Photograph the existing door. Capture the exterior, interior, edge, mortise pocket, cylinder or opening, handle, frame, strike, and nearby trim.
- Measure the two centerlines. Record the 35 mm backset and 85 mm center distance from the supplier’s stated datums. Note any difference between the code and the measured body.
- Measure the complete body. Record faceplate dimensions, case height/depth, corner shape, fixing holes, latch or hook, deadbolt, follower, spindle, cylinder, and projections.
- Measure door and frame conditions. Include door thickness, material, stile width, handing, reveal, strike, panel clearance, and the travel required to close and lock.
- Install mechanically first. Test the key or manual override, handle return, latch or hook, deadbolt, inside release, door closure, and strike alignment before adding batteries.
- Test electronics second. Check the required fingerprint, PIN, card, app, Bluetooth, Wi-Fi, gateway, door sensor, and low-battery behaviors only after the mechanical cycle is smooth.
- Freeze the approved revision. Save the drawing, sample photos, software and app assumptions, packaging version, open issues, and sign-off with the purchase order.
What to Send a Supplier for a 3585 Quote
A supplier can review a 3585 request much faster when the code is accompanied by an evidence pack.
| Élément de transfert | Recommended information |
|---|---|
| Notation | 3585, supplier model, 35 mm backset, 85 mm center distance, reference surfaces, drawing revision, and any suffix. |
| Mortise geometry | Faceplate, case, corner shape, fixing holes, latch/hook/deadbolt, cylinder opening, follower, spindle, and bolt travel. |
| Door and frame | Material, thickness, stile/profile, edge preparation, handing, reveal, strike, clearance, and photographs with a scale. |
| Smart assembly | Panel dimensions, motor, adapter, mounting posts, cable path, battery, emergency power, door sensor, and required platform. |
| Project requirements | Quantity, target market, finish, private-label needs, packaging, documentation, certification requirements, and sample schedule. |
| Approval record | Mechanical and electronic test results, unresolved questions, approved drawing, sample photos, and sign-off. |
For custom body, panel, branding, or documentation requirements, transition to the site’s OEM/ODM smart lock support. The commercial discussion should follow a drawing comparison, not replace it.
Foire aux questions
Does 3585 mean 35 mm backset and 85 mm center distance?
That is the common interpretation in the inspected 3585 references. Confirm the order and measurement datums on the exact supplier drawing before ordering.
Is 3585 the same as 35×85?
Often, but not automatically. The notation may identify 35 mm backset and 85 mm pitch, while a listing may use the numbers in another order or use one number for a different datum. Ask for a marked drawing.
Is 3585 the same as 4585?
No. 4585 commonly indicates a 45 mm backset and 85 mm center distance, so the handle and cylinder relationship is different from the common 3585 interpretation.
Is 3585 only for sliding doors?
No. It is frequently associated with sliding or narrow-stile applications, especially hook-bolt bodies, but 3585-labeled products also appear in hinged-door smart-lock configurations. Confirm the exact function, case, strike, and door material.
Does 3585 identify the faceplate or lock-case size?
Not by itself. The label usually points to two centerline dimensions or a product family. Faceplate length and width, case depth and height, corners, fixing holes, and function need separate confirmation.
Will any Tuya or TTLock smart lock fit a 3585 mortise?
No. Tuya and TTLock describe electronic platforms or access workflows. The mechanical body, motor, spindle or cylinder adapter, mounting points, cable, battery housing, panel clearance, and strike still need to match.
What door thickness fits a 3585 smart lock?
The 3585 code does not specify door thickness. Use the exact smart-lock model’s thickness range and verify through-bolt length, spindle or cylinder length, panel seating, and cable clearance.
Can I keep the existing 3585 mortise?
Possibly, if the body is mechanically sound and the smart panel or adapter has a documented interface for its movement, follower or cylinder, handing, fixing, and clearance. A matching number pair alone is not enough.
When should I request a physical sample?
Request one before a batch order when the existing body is an unknown brand, the door pocket is narrow, the strike is unusual, the panel sits near trim or glass, the application is sliding, or multiple doors must repeat the same result.
Conclusion
A 3585 smart lock mortise commonly means 35 mm backset and 85 mm center distance. That notation explains the basic geometry, but it does not guarantee that a mortise body, smart panel, door, frame, and strike will work together.
Confirm the drawing datums, full mortise envelope, bolt function, cylinder and follower, door and frame conditions, electronic interface, and handing. Test one representative assembly mechanically and electronically before approving a repeated order. For a private-label or adapted project, request an OEM/ODM specification review tied to the approved 3585 drawing.