Name: CISA 52756 80 mm Backset Heavy-duty exterior lock with deadlocking latch (152756800)
Brand: CISA

CISA 152756800 — Official series illustration, not a photo of this exact size variant; consult model specifications. — Official series illustration, not a photo of this exact size variant; consult model specifications.Image source

152756800 backset 80 mm measurement-reference diagram; not a product view — Drawn by this site from the explicit dimensions of the corresponding model; the diagram is not to scale and is not a drilling template.

Lock and fitting dimensions

Dimensions from model documentation
Specifications	Dimensions from model documentation
Backset	80 mm
Faceplate width	22 mm
Centre distance	85 mm

Check the backset, centre distance, faceplate and mounting points against the specific model drawing.

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Specifications

Backset: 80 mm
Faceplate width: 22 mm
Case: Galvanized steel
Latch: Reversible nickel-plated silent construction
Faceplate ends: Rounded ends
Centre distance: 85 mm
Bolt/latch configuration: Deadlocking latch only
Operation: Latch operated by handles on both sides or by the cylinder
Outside handle condition: Must be disabled

Construction and operation of this version

152756800 is an explicit ordering row in the 52756 series with backset 80 mm. The catalogue explicitly requires the outside handle to be disabled for this exterior-door lock. Check compatibility between the outside operating component and cylinder; do not install it as an ordinary lock allowing free passage from both sides.

How to check installation dimensions

This model's backset is 80 mm, the distance from the specified door-edge faceplate reference to the operating axis. Faceplate width, centre distance and external lock-body depth describe different directions and must not substitute for one another.

For replacement, record the old lock's full number, faceplate-end shape, inside and outside operating components and strike positions; when changing handing or linked rods, confirm interfaces according to the product instructions.

Limitations

The 70 mm row explicitly includes finish suffix 20; this batch retains only the actual row and does not invent a same-size model without that suffix.
Series certification and catalogue descriptions of fire or escape applications do not mean this model meets current requirements when installed in any door assembly.
Check accessories against the corresponding model and installation instructions; Cylinders, rods and escutcheons listed as available on request are not standard equipment.

Sources

CISA 2026 English catalogue, PDF page 350 / printed page 346

Manufacturer documents are provided in their original language.

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