Arrow BM11 Apartment Mortise Lock

About this item

The Arrow BM11 is the apartment/front door function mortise lock from Arrow's BM Series - ANSI function F12, with both stopworks and a 1-inch throw deadbolt for two independent outside locking modes, and simultaneous latchbolt and deadbolt retraction from the inside lever in a single motion. If you searched "arrow mortise locks", "arrow mortise lock", "arrow locksets", "arrow lockset", "arrow 11", or "arrow lock catalog" - this is the product.

"Arrow 11" and "Arrow Lock Catalog": What These Searches Mean

If you searched "arrow 11" - the BM11 is the Arrow BM Series mortise lock in function 11 (apartment/front door, ANSI F12). The number 11 designates the function within the BM Series catalog. Arrow's BM Series is the company's primary institutional mortise lock catalog line, spanning schools, hospitals, apartment buildings, government facilities, and commercial buildings. The full BM Series catalog covers every standard ANSI mortise function in a single standardized case - BM01 through BM84 - with the same uniform mortise prep throughout. The BM11 is the apartment/front door function in that line.

"Arrow Locksets" and "Arrow Lockset": The Brand Context

Arrow Lock is part of ASSA ABLOY, the same corporate family as Yale, Sargent, and Corbin Russwin. The BM Series is Arrow's heavy-duty Grade 1 mortise lockset platform - the product line specified by architects and institutional facilities directors for multifamily residential corridors, hotel guest rooms, hospital room doors, and commercial front entries where a combined latchbolt and deadbolt in one mortise case is the requirement.

ANSI F12 Apartment Function: The Three Operating States

This is the content gap on every competitor page for the BM11. Every page states the ANSI F12 function but none of them explain what the three states are or what the stopworks does. Here is the full plain-language breakdown:

State 1 - Free latch (fully unlocked): Both levers retract the latch from either side without any key or button operation. The outside lever works normally. Anyone can enter.

State 2 - Stopworks engaged (inside lever locks outside lever): The stopworks is a small mechanical slide or button accessible from the lock front on the interior side of the door. When the occupant inside activates the stopworks, the outside lever is locked - it cannot retract the latch from outside. This is not key-controlled. The occupant sets it manually and leaves it set until they deactivate it. This provides inside privacy and security control without requiring key use. It is why this function is called "apartment" - a resident locks their unit from the inside without using the deadbolt key, simply by engaging the stopworks before bed or when inside.

State 3 - Deadbolt projected (highest security, key-controlled): A 360-degree key turn from outside or a turnpiece rotation from inside projects the one-inch throw stainless steel deadbolt. When the deadbolt is projected, the outside lever is also blocked - neither latch nor deadbolt can be retracted from outside without the key. This is the second and stronger locking mode, used when leaving the apartment (key from outside) or when the maximum security locking is needed from inside (turnpiece).

Both the stopworks and the deadbolt independently lock the outside lever - either one alone is sufficient to secure outside entry. Used together, the deadbolt provides positive key-controlled security while the stopworks gives the occupant inside quick lever-lockout without key operation.

Simultaneous Latch and Deadbolt Retraction: The Anti-Panic Feature

The inside lever retracts both the latchbolt AND the deadbolt simultaneously in a single turn. This is the ANSI F12 panic-safe design: regardless of whether the deadbolt is projected or the stopworks is engaged, the inside lever always provides immediate egress in one motion. No separate deadbolt retraction, no separate key turn from inside, no sequence of operations. Turn the inside lever - door opens.

This is the critical life-safety function of the apartment/front door mortise lock in both multifamily residential and commercial front door applications. In a fire or emergency, the occupant does not need to remember to retract the deadbolt before opening the door.

Three Bolts in One Case: Latchbolt, Auxiliary Latch, and Deadbolt

Latchbolt: Stainless steel, two-piece mechanical with anti-friction insert. 5/8" x 1" x 3/4" throw. The two-piece construction with anti-friction insert means the latch face rotates freely when it contacts the strike during door closing - reducing the force required to close the door and preventing latch bounce. The insert is the mechanical anti-friction element that spins on contact.

Auxiliary latchbolt: 9/16" effective throw with 3/8" effective auxiliary latch deadlocking. The deadlocking auxiliary latch pin engages the strike face when the door is fully closed, locking the main latchbolt against being pushed back with a card, knife blade, or shimming tool. Loiding the latch is not possible when the door is properly closed against the strike.

Deadbolt: One-piece stainless steel, 19/32" x 1-1/4" x 1-inch throw. Full inch throw into the strike. The deadbolt case dimensions (19/32" x 1-1/4") provide a large bolt cross-section that resists saw attack and spreader attacks that try to open the strike gap.

BM11 Lever and Rose Options: Ordering the Right Configuration

The BM11 is available with multiple lever designs on rose (L suffix) or escutcheon (H suffix or G suffix) trim:

Lever designs: BR (Broadway), HS (Hastings), V, J, X - each with its own profile. Lever + rose combinations designated by two letters (e.g., BRL = Broadway lever, L rose; BRH = Broadway lever, H escutcheon).

Finishes: 03 bright brass, 04 satin brass, 10 satin bronze, 10B dark bronze, 26 bright chrome, 26D satin chrome, 32D satin stainless.

Keyway: A keyway standard. Master keying, construction master keying, visual key control, concealed key control, and IC (interchangeable core) options available. IC model designated BM11 IC7 - accepts Arrow IC cores.

Body only: BM11LB - lockcase without trim for projects where trim is specified and ordered separately.

Specifications

Model: Arrow BM11

Series: BM Series Lever Mortise Locks

Function: ANSI F12 - Apartment/Front Door

Outside Lever Locking: Stopworks (mechanical, inside-set) AND deadbolt (key outside / turnpiece inside) - independent, either locks outside lever

Inside Lever: Always retracts latchbolt and deadbolt simultaneously - single motion egress

Latchbolt: 2-piece stainless steel with anti-friction insert, 5/8" x 1" x 3/4" throw

Auxiliary Latch: 9/16" throw, 3/8" deadlocking

Deadbolt: 1-piece stainless steel, 19/32" x 1-1/4" x 1" throw

Lockcase: Heavy gauge steel, zinc dichromate, 5-7/8" x 4" x 15/16"

Armored Front: Heavy gauge steel, 8" x 1-1/4" x 3/32"

Backset: 2-3/4"

Door Thickness: 1-3/4" standard

Handing: Handed - field reversible without disassembly

Keyway: A keyway standard

Keys: Two nickel silver

Body Only: BM11LB

ANSI/BHMA: A156.13 Series 1000 Grade 1

UL/cUL: A label and lesser class, 4' x 10' single, 8' x 10' pair

Federal: FF-H-106C, Series 86 and 87

ADA: Compliant

Warranty: 5-year limited

American Locksets has stocked Arrow BM Series mortise locks since 2001.