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Introduction: Why Choosing the Right Commercial Lock Matters

Commercial door locks are not interchangeable. The wrong lock on the wrong door can mean a code violation, a security failure, an ADA non-compliance issue, or a hardware failure within months of installation. This guide is designed to give architects, general contractors, facility managers, and building owners a clear, authoritative reference for every major type of commercial door lock — what it is, where it belongs, and how to specify it correctly.

The ANSI/BHMA Grading System

Before diving into lock types, it's essential to understand how commercial locks are graded. The American National Standards Institute (ANSI) and the Builders Hardware Manufacturers Association (BHMA) publish performance standards for door hardware. Locks are graded on a 3-tier system:

• Grade 1 — Heavy-duty commercial. Tested to 250,000 cycles minimum. Required for high-traffic commercial, institutional, and industrial applications.
• Grade 2 — Light commercial/heavy residential. Tested to 150,000 cycles. Suitable for light commercial and multi-family residential.
• Grade 3 — Residential only. Tested to 100,000 cycles. Not appropriate for commercial use.

For any commercial application, always specify Grade 1 hardware. Grade 2 and Grade 3 products will fail prematurely under commercial traffic loads.

1. Mortise Locks

The mortise lock is the workhorse of commercial door hardware. It is recessed (mortised) into a pocket cut into the door edge, providing a robust, multi-function locking mechanism in a single unit.

How It Works

A mortise lock contains a latchbolt (spring-loaded, for latching the door), a deadbolt (key-operated, for security), and often an auxiliary latch (anti-shimming protection). The lock body is recessed into the door, with trim (levers or knobs) on both sides and a cylinder on the outside.

Key Advantages

• Highest security of any mechanical lock type
• Multiple functions available in a single unit
• Long service life — Grade 1 mortise locks are rated for 250,000+ cycles
• Wide range of trim and finish options
• Compatible with electrified functions for access control

Common Applications

Office buildings, schools, hospitals, government facilities, hotels, and any application requiring high security and durability.

Leading Manufacturers

Schlage L-Series, Yale 8800 Series, Sargent 8200 Series, Corbin Russwin ML2000 Series, Best 45H Series.

Specification Notes

Mortise locks require an ANSI A115.1 door prep. Verify door thickness (standard 1-3/4") and backset (standard 2-3/4") before ordering. Specify function, trim style, finish, handing, and cylinder format separately.

2. Cylindrical Locks (Bored Locks)

Cylindrical locks — also called bored locks or knobsets/leversets — are installed through a cylindrical hole bored through the door face. They are simpler and less expensive than mortise locks but offer lower security and shorter service life under heavy use.

How It Works

The lock mechanism is contained in a cylindrical chassis that fits through the bored hole. A separate latch assembly is installed in the door edge. The cylinder is integrated into the knob or lever.

Key Advantages

• Lower cost than mortise locks
• Easier and faster to install
• Wide availability of replacement parts
• Suitable for light-to-medium commercial applications

Common Applications

Interior office doors, storage rooms, light commercial applications, multi-family residential common areas.

Leading Manufacturers

Schlage ND Series, Yale AU Series, Sargent 10 Line, Corbin Russwin CL3300 Series.

Specification Notes

For commercial use, always specify Grade 1 cylindrical locks. Grade 2 products are not appropriate for high-traffic commercial doors. Standard bore is 2-1/8" diameter at 2-3/4" backset.

3. Exit Devices (Panic Hardware)

Exit devices — also called panic bars or panic hardware — are required by code on certain occupancy types and allow rapid egress by pushing on a horizontal bar or touchpad. See our dedicated Exit Hardware Guide for full detail.

Types

• Rim exit devices — most common, surface-mounted latch
• Mortise exit devices — highest security, recessed mortise body
• Vertical rod exit devices — for pairs without center mullion
• Concealed vertical rod — rods routed through door interior

Code Requirements

Required by IBC and NFPA 101 in assembly, educational, and high-hazard occupancies. Fire-rated doors require fire exit hardware (UL 305 listed), not standard panic hardware.

Leading Manufacturers

Von Duprin 99/98 Series, Yale 7000 Series, Sargent 80 Series, Corbin Russwin ED4000/ED5000 Series.

4. Electrified Locks

Electrified locks integrate electrical functions into mechanical lock hardware for access control, remote locking/unlocking, and monitoring. They are the bridge between traditional mechanical hardware and modern access control systems.

Types of Electrified Locks

Electric Strikes

Replace the standard strike plate. The strike is electrically controlled to release the latch, allowing the door to open without retracting the latch. The lock itself remains mechanical. Electric strikes are fail-safe (unlocked when power fails) or fail-secure (locked when power fails) — specify based on life-safety requirements.

Best for: Controlled entry points where the door needs to be released remotely. Common in apartment buildings, office lobbies, and access-controlled corridors.

Electrified Mortise Locks

Standard mortise lock with an electrified function — typically electric latch retraction or electric deadbolt. Provides the full security of a mortise lock with access control capability.

Best for: High-security access-controlled openings in commercial and institutional buildings.

Electrified Cylindrical Locks

Cylindrical lock with an electrified function. Less common than electrified mortise locks but used in light commercial access control applications.

Magnetic Locks (Maglocks)

An electromagnetic lock that holds the door closed by magnetic force (typically 600–1,200 lbs holding force). No mechanical latch — the door is held purely by magnetism. Must be fail-safe (unlocked when power fails) for life-safety compliance. Requires a separate egress device (REX sensor, push-to-exit button, or motion sensor) for ADA-compliant egress.

Best for: Controlled access points where a traditional latch is not practical, such as glass doors, aluminum storefront doors, and sliding doors.

Electromagnetic Locks with Integrated Egress

Combines a maglock with an integrated request-to-exit (REX) sensor or push-to-exit button for code-compliant egress without a separate device.

5. Deadbolts

Commercial deadbolts provide a secondary locking function — a bolt that extends into the strike without spring action, requiring a key or thumbturn to retract. They are used as standalone locks on low-security doors or as supplemental security on doors with a primary latch lock.

Single Cylinder vs. Double Cylinder

• Single cylinder — key outside, thumbturn inside. Standard for most commercial applications.
• Double cylinder — key required on both sides. Used where a glass panel near the lock could allow someone to reach in and turn a thumbturn. Note: double cylinder deadbolts may be restricted by fire code on egress doors — always verify with the AHJ.

6. Padlocks and Hasps

Used for securing gates, storage areas, equipment, and temporary installations. Commercial-grade padlocks (Grade 1) feature hardened steel shackles, anti-pick cylinders, and weather-resistant bodies. Not appropriate for primary building egress doors.

7. Keypad and Smart Locks

Electronic locks with keypad, card reader, fob, or smartphone credential input. Increasingly common in commercial applications for their audit trail capability, remote management, and elimination of physical keys.

Key Considerations

• Verify compatibility with your access control system before specifying
• Confirm the lock is rated for the door's fire rating if applicable
• Ensure the credential reader meets ADA mounting height requirements (15"-48" AFF)
• Specify fail-safe or fail-secure based on life-safety requirements

Finish Standards: ANSI/BHMA Finish Codes

Commercial hardware finishes are standardized under ANSI/BHMA A156.18. Common finishes and their codes:

• 605 (US3) — Bright Brass
• 606 (US4) — Satin Brass
• 612 (US12) — Satin Bronze
• 613 (US10B) — Oil-Rubbed Bronze
• 626 (US26D) — Satin Chrome — most common in commercial
• 628 (US28) — Satin Aluminum
• 630 (US32D) — Satin Stainless Steel — best for exterior/coastal
• 689 (US28) — Aluminum Painted

Always specify hardware in matching finishes across all components on a door — lock, hinges, closers, and exit devices.

Master Key Systems

Commercial buildings typically use a master key system that allows different levels of key access across the building. Common configurations:

• Grand Master Key (GMK) — opens all locks in the system
• Master Key (MK) — opens a subset of locks (e.g., all locks on one floor)
• Change Key (CK) — opens only one specific lock

Interchangeable Core (IC) systems — including SFIC (Small Format) and LFIC (Large Format) — allow cylinders to be rekeyed without tools by swapping the core, dramatically reducing rekeying costs in large facilities.

Quick Reference: Lock Type by Application

Shop Commercial Door Locks at Park Avenue Locks

Park Avenue Locks specializes in commercial-grade door hardware from the industry's most trusted manufacturers — Yale, Schlage, Sargent, Von Duprin, Corbin Russwin, and more. Whether you're specifying a complete hardware schedule for a new build or sourcing a replacement lock for an existing facility, our team has the expertise to help you get it right.

Browse our commercial door lock selection or contact us for project-specific guidance, specification support, and volume pricing.