Name: CISA 52526 45 mm Backset Mortise lock with multiple cylindrical bolts (152526450)
Brand: CISA

CISA 152526450 — 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

152526450 backset 45 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	45 mm
Faceplate width	25 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: 45 mm
Faceplate ends: Square ends
Faceplate width: 25 mm
Centre distance: 85 mm
Bolt throws: 2
Bolt construction: Three nickel-plated steel cylindrical bolts
Latch: Nickel-plated, flat and reversible
Locking-point connection: Prepared for additional locking points
Case: Galvanized steel

Construction and operation of this version

152526450 is an explicit ordering row in the 52526 series with backset 45 mm. The square-ended 25 mm faceplate and preparation for additional locking points determine the door-edge recess and locking-point layout. Three cylindrical bolts do not mean three independent locking points on the door frame; they are concentrated in the central lock body; additional top and bottom locking points require the corresponding connections.

How to check installation dimensions

This model's backset is 45 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

Extension rods and floor strikes listed as optional in the catalogue are not standard equipment for this item.
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 348 / printed page 344

Manufacturer documents are provided in their original language.

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