A bathroom door needs to stay closed, provide privacy and allow the intended emergency access. Buying the lockcase, handles and turn/release separately can leave one of those jobs unresolved. TOPTEK EN78WCL gives door manufacturers a defined bathroom-lock platform around which to coordinate the complete set.
TL;DR: Choose the backset-specific EN78WCL model; match the lever and privacy-turn interfaces; include the outside release in the furniture order.
What Should a Bathroom Mortise Lock Set Include?
A bathroom mortise lock thumbturn and emergency release must work with the lockcase’s privacy mechanism. In TOPTEK EN78WCL, the handle operates the latch and the turn operates the deadbolt. The complete WC set therefore needs compatible lever furniture, an inside turn, an outside release, suitable spindles and fixings, and the matching strike. TOPTEK offers 55, 60 and 65 mm backsets with 78 mm centres. Select the geometry first, then coordinate the furniture for the actual door thickness and intended release method.
The TOPTEK European mortise-lock range includes several functions. A passage latch and a bathroom privacy lock are distinct choices even where their cases look similar.
Choose the EN78WCL Model for Your Door
The EN78WCL bathroom range connects the backset to an identifiable full model. This makes a specification more useful than an order line that says only “78 mm bathroom lock”: 78 mm describes the centre distance, not the backset.
| Full model | Backset | Centre distance | Operating arrangement |
|---|---|---|---|
| EN5578WCL | 55 mm | 78 mm | Handle operates latch; turn operates deadbolt |
| EN6078WCL | 60 mm | 78 mm | Handle operates latch; turn operates deadbolt |
| EN6578WCL | 65 mm | 78 mm | Handle operates latch; turn operates deadbolt |
The EN78WCL product configuration specifies a 235 mm-long, 3 mm-thick forend, with 20, 22, 23 or 24 mm widths and round or square ends. It also specifies a 20 mm deadbolt projection. These choices help door factories coordinate edge preparation and strikes before repeating the machining across a batch.
Keep Lever Operation and Privacy Operation Clear
The lever retracts the latch for normal opening. The privacy turn projects or retracts the deadbolt. Do not assume that pressing the lever also releases the privacy bolt: specify and demonstrate the actual exit sequence required for the door.
The lock’s lever-follower options are listed as 8 × 8 mm and 9 × 9 mm. Those are lever-interface dimensions; they do not define the separate privacy-turn spindle. Select the turn and release by their own mating interface, engagement length and fixing layout.
This distinction helps importers avoid ordering an attractive WC furniture set that cannot operate the chosen lock. It also helps door manufacturers keep the two operating centres aligned with the plate or roses rather than repairing the preparation later.
Specify the Outside Release with the Furniture
The emergency release belongs in the complete bathroom-door specification. Identify the intended coin or tool interface, how the outside fitting connects to the privacy mechanism, and whether an occupied indicator is required. An indicator is a separate furniture feature; it should not be inferred from the EN78WCL model name.
For a useful sample, fit the inside turn and outside release on the intended door thickness. Check privacy engagement, release from outside and return to normal use. A loose lockcase cannot establish spindle engagement through a finished door or whether the chosen trim leaves the release accessible.
For an early compatibility discussion, send photographs of the proposed furniture, its spindle dimensions and the door thickness. TOPTEK can review them alongside the selected lock configuration before you request a production quotation.
What Supports the TOPTEK Selection?
TOPTEK’s Intertek Certificate of Constancy of Performance 2649-CPR-26002201, issued on 4 June 2026, lists EN5578WCL, EN6078WCL and EN6578WCL and identifies their handle-operated latch and turn-operated deadbolt function. This gives buyers a model-specific documentary reference to request with their quotation. See the CE mortise-lock certificate guide for the document route and scope.
The product specification identifies an integrally precision-cast SS304 latch, SS304 deadbolt and forend, and a 1.5 mm SECC case. This distinguishes the specified components clearly: “stainless bathroom lock” does not mean every part is made from the same alloy. For a fire-door order, match the exact supplied configuration to the applicable current documents and doorset requirements.
Bathroom Privacy or Passage Latching?
A passage latch such as EN72LL is intended for latch operation without the EN78WCL privacy-deadbolt arrangement. It may be appropriate for a circulation door, but it is not a substitute for the bathroom set described here.
The purchasing benefit is a clear division of functions across the door schedule. Keep the bathroom lock, turn/release, lever furniture and strike on the same schedule line or linked component list. That reduces the chance of a latch-only item being delivered against a privacy requirement.
Request a Complete WC Lock Set
TOPTEK’s door hardware manufacturing capabilities provide a route for door manufacturers and hardware brands to discuss coordinated configurations and supply requirements. The starting point is the buyer’s complete door arrangement.
- Choose EN5578WCL, EN6078WCL or EN6578WCL and the required quantity.
- Provide door thickness, material, handing and preparation drawing.
- Identify lever furniture, inside turn, outside release and any indicator requirement.
- Specify forend width/end shape, strike, finish and included fixings.
- State documentation requirements, branding/packing needs and sample quantity.
A clear WC order joins privacy, normal opening and emergency access in one usable assembly. Request an EN78WCL configuration and quotation with your door and furniture details so TOPTEK can propose the corresponding model and sample set.
Frequently Asked Questions
What does 78 mm mean on an EN78WCL bathroom lock?
It is the centre distance. The available backsets are 55, 60 and 65 mm, identified by full models EN5578WCL, EN6078WCL and EN6578WCL.
Does the lever automatically retract the privacy deadbolt?
The documented EN78WCL function assigns latch operation to the handle and deadbolt operation to the turn. Do not assume automatic deadbolt retraction by the lever.
Is an outside release included with every lockcase?
The outside release and inside turn must be identified in the furniture and packing specification. A lockcase-only order does not define a complete WC set.
Can an EN72LL passage latch replace the bathroom lock?
Not for the same privacy function. EN72LL provides passage latching; EN78WCL provides a separate turn-operated deadbolt as well as the latch.