Heavy Duty Narrow Backset Mortise Locks

Lock Information and Specifications

A high quality heavy duty commercial grade narrow backset mortise lock series capable of meeting the requirements of a vast array of lever handle designs and are available in 1¼", 1½", 1¾", 2" and 2¼" backsets. They incorporate a standard 1¼" wide faceplate and are designed for doors 1¾" thick and greater. They may also be ordered with a 1" wide faceplate designed for doors 1⅜" thick and greater on request. A universal curved lip strike for hollow metal and wood frame construction conforms to ANSI Standard A 115.1, 4.875 × 1.25" (124 × 32 mm) lip to center. Flat lip, special length and custom strikes may also be ordered to accommodate various project conditions and requirements.

Our narrow backset mortise locks employ highcarbon steel compression springs for long life and durability of service. Hubs are fabricated of solid brass. Cases are designed to accommodate through bolted trim for positive alignment with the lock case. Locks are regularly furnished with a ¾" throw one-piece mechanical heavy-duty latch bolt.

Faceplates and strikes are fabricated standard in nonmagnetic 304 alloy stainless steel. Brass or bronze substrates and most decorative finishes may be had on a special order basis.

Narrow Backset Mortise Locks are not UL listed and should only be specified for applications not requiring a fire-rated or UL listed lockset. They are the best choice for any building where safety, security and design compatibility are prime considerations.

Steel Case

Size varies according to backset. Heavy gauge 0.093" (2.36 mm) thick, corrosion resistant zinc dichromate finish.

Armor Front

0.218 × 1.25 × 8" or 0.218 × 1 × 8" (6 × 32 × 203 mm or 6 × 25 × 203 mm). Adjustable for beveled conditions from flat to standard bevel 0.125" on 2" (3 mm on 51 mm).

Faceplate (Scalp)

0.062 × 1.25 × 8" or 0.062 × 1 × 8" (1.57 × 32 × 203 mm or 1.57 × 25 × 203 mm). Wrought stainless steel, bronze or brass substrate.

Latch Bolt

0.5 × 1" (12 × 25 mm) × 0.75" (19 mm) throw. One-piece solid brass.

Dead Bolt

0.50 × 0.75" (12,7 × 19 mm) × 1" (25 mm) throw with free-rotating hardened steel saw-proof inserts. Solid brass.

Hub (Solid)

0.318 (8 mm) square solid brass with one way rotation for levers (LS) and one-way rotation for knobs (KS).

Thumbturn Hub

0.1875" (5 mm) diamond, solid brass, 90 degree rotation.

Backsets

1¼, 1½, 1¾, 2 and 2¼".

(32, 38, 44, 51 and 57 mm).

Spacing

3.625" (92 mm) center hub to center cylinder, 2.4375" (62 mm) center lever hub to thumbturn hub.

Through-bolting

1.5 to 1.6875" (38 to 43 mm) center to center.

Strike

4.875 × 1.25" (124 × 32 mm) lip to center. Wrought stainless steel, bronze, and brass substrate finished to match.

Supplied to ANSI Standard A 115.1. Regulary furnished with universal curved lip strike. Flat lip, special length and wrought dust boxes also available.

Template

Metal doors and frames to be prepared in accordance with ANSI A 115.11.