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Mortise Locks
National Lock Supply offers a full line of Mortise Locks with an expansive range of manufactures, functions, trims and options available for a variety of end user applications.
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Frequently Asked Questions
What is a mortise lock?
A mortise lock is a mechanical lock installed inside a rectangular pocket (mortise) cut into the door. At National Lock Supply, we offer mortise locks designed for heavy-duty commercial, institutional, and upscale residential projects.
How does a mortise lock differ from a cylindrical lock?
Cylindrical locks fit into round bores, while mortise locks require a deep rectangular cutout. Mortise locks offer more functions, strength, and durability, but take longer to install.
What door prep is required?
Mortise locks need a custom pocket cut to manufacturer specifications, usually in wood or metal doors. This is more complex than the standard cylindrical 2-1/8″ bore.
What ANSI functions are available?
Mortise locks provide the widest range: Passage, Entry, Storeroom, Classroom, Privacy, Apartment, and Office functions, often combining a latch and deadbolt in one case.
What grades are offered?
Most mortise locks are ANSI/BHMA Grade 1, the highest durability rating, suitable for high-traffic and security-critical openings.
Are mortise locks ADA compliant?
Yes. Lever-operated mortise locks meet ADA/ICC requirements, unlike knob-operated versions.
Where are mortise locks commonly used?
They are standard in universities, hospitals, government buildings, hotels, and high-end homes where longevity and strength are critical.
What finishes are available?
Finishes include Satin Chrome, Oil-Rubbed Bronze, Bright Brass, Stainless Steel, and Matte Black to match architectural hardware.
Can mortise locks integrate with key systems?
Yes. They use standard mortise cylinders, interchangeable cores (SFIC/LFIC), or restricted key systems, making them ideal for master key setups.
Why buy mortise locks from National Lock Supply?
We stock Grade 1 mortise locks in all major functions and finishes, with expert support to ensure proper door prep and long-lasting security.