CISA 52844 80 mm Backset Function D heavy-duty escape mortise lock (152844800)

Lock and fitting dimensions

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

Specifications

Backset

80 mm

Faceplate width

22 mm

Case

Galvanized steel

Latch

Reversible nickel-plated silent construction

Faceplate ends

Square ends

Centre distance

85 mm

Function

D

Bolt throws

1

Square spindle

Split

Inside operation

Handle or escape device operates latch and bolt

Outside operation

Handle operates latch

Key operation

Bolt-only operation on both sides

Construction and operation of this version

152844800 is an explicit ordering row in the 52844 series with backset 80 mm. With function D, after opening from inside, the bolt remains retracted when the door closes again; the outside handle remains enabled and can retract the latch. This access state differs from function B, where the outside handle remains disabled; selection should follow actual access-management needs.

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

• 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

Manufacturer documents are provided in their original language.

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