CISA 52761 70 mm Backset Function B heavy-duty escape mortise lock (152761700)

Lock and fitting dimensions

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

Specifications

Backset

70 mm

Faceplate width

22 mm

Case

Galvanized steel

Latch

Reversible nickel-plated silent construction

Faceplate ends

Rounded ends

Centre distance

85 mm

Function

B

Bolt/latch configuration

Latch only, with anti-manipulation mechanism

Square spindle

Split

Outside control

Key enables/disables handle

Construction and operation of this version

152761700 is an explicit ordering row in the 52761 series with backset 70 mm. Function B uses a split spindle; the key enables or disables the outside handle; the inside handle or escape device operates the latch. After opening from inside and closing again, the outside handle remains disabled; distinguish this from function D, intended for continued outside access.

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

• Select escape operating devices separately within the manufacturer's compatible range; the function letter does not establish compliance of the complete door.
• 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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