What is the best commercial mortise lock?

The Schlage L9000 is the most widely specified. The Sargent 8200 has the highest cycle count at 14M+. The Corbin Russwin ML2000 is heavily specified on government projects. All are ANSI/BHMA Grade 1.

What is the difference between Grade 1 and Grade 2 locks?

Grade 1 locks are tested to 1,000,000+ cycles with higher impact resistance. Grade 2 are rated for 250,000 cycles. Grade 1 is standard for commercial exterior doors and high-traffic areas.

What is the best door lock for school classrooms?

The Schlage ND78 classroom security lock allows locking from inside without opening the door, meets ADA requirements, and maintains fire egress compliance.

What is the difference between Schlage ND and ALX?

ND is Grade 1 with 1M+ cycles and electrified options. ALX is Grade 2 with 250K cycles and modular chassis at lower cost. They share the same lever designs.

What is the most common commercial door closer?

The LCN 4040XP is the most widely specified surface-mounted commercial door closer in the US, covering sizes 1-6 and all three mounting types.

What locks are used in hospitals?

Grade 1 mortise locks on high-traffic doors, cylindrical locks on patient rooms, electronic access with audit trails on pharmacy and restricted areas.

How much cheaper is wholesale vs retail door hardware?

Wholesale pricing on commercial door hardware is typically 20-40% below manufacturer list price. Project quotes for large orders can be even lower.

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Door Bolts

Door Bolts

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Door bolts secure the inactive leaf of a pair of doors, or add a manual lock to a single door. On a pair, the bolts hold the inactive door in place at the top and bottom so the active door's lock or exit device has something solid to latch against.

B&H Depot carries flush bolts and surface bolts from IVES, Rockwood, Hager and Don Jo, plus dust-proof strikes and accessories.

Types of Door Bolts

Manual flush bolts: mortised into the edge of the door and operated by a lever. Clean look; used on interior and exterior pairs that are not fire rated.
Automatic and constant latching flush bolts: latch the inactive door automatically when it closes. Used on fire-rated pairs, where both leaves must latch every time.
Surface bolts: mounted on the face of the door. Easy to install on existing doors, gates and utility doors.
Dust-proof strikes: installed in the floor for bottom bolts, with a spring-loaded plunger that keeps debris out.

How to Choose

Door material: metal doors and wood doors use different flush bolt preparations.
Fire rating: fire-rated pairs generally need automatic or constant latching flush bolts.
Rod length and finish: match the top rod length to your door height and the finish to your other hardware.

See also: flush bolts and surface bolts.

Frequently Asked Questions

What is the difference between a flush bolt and a surface bolt?

A flush bolt is mortised into the edge of the door so it sits flush. A surface bolt mounts on the face of the door and is easier to install on existing doors.

Can I use manual flush bolts on a fire-rated pair of doors?

Fire-rated pairs generally need automatic or constant latching flush bolts so the inactive leaf latches every time. Check your local code and the door label.