Name: CISA 52842 70 mm Backset Function A heavy-duty escape lock with anti-manipulation mechanism (152842700)
Brand: CISA

CISA 152842700 — 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

152842700 backset 70 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	70 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: 70 mm
Faceplate width: 22 mm
Case: Galvanized steel
Latch: Reversible nickel-plated silent construction
Faceplate ends: Square ends
Centre distance: 85 mm
Function: A
Bolt throws: 1
Bolt/latch configuration: Latch and bolt with anti-manipulation mechanism
Square spindle: Through spindle
Outside operation: Key-only operation of latch and bolt
Inside operation: Key, handle or escape device operates latch and bolt

Construction and operation of this version

152842700 is an explicit ordering row in the 52842 series with backset 70 mm. The square-ended faceplate version with function A explicitly lists an anti-manipulation mechanism in this model section; Outside operation is by key only; inside operation can use a handle or escape device. Without a description of automatic action, the door-closing bolt action of adjacent 52840/52860 must not be assumed.

How to check installation dimensions

This model's backset is 70 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

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 351 / printed page 347

Manufacturer documents are provided in their original language.

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