Mortise Lock

A mortise lock fits into a deep pocket cut into the door edge, rather than through a round bore like a cylindrical lockset. That construction is why mortise locks are the standard for commercial buildings, schools, and apartment entries: the heavy cast or steel lock body withstands decades of high traffic, integrates deadbolt and latch in one unit, and offers far more functions (entry, classroom, storeroom, privacy, passage) than a cylindrical lock.

When choosing a mortise lock, start with the function you need on that door. An office function locks from outside while always allowing free egress. A storeroom function is always locked outside. An entrance function adds a deadbolt for after-hours security. Then confirm handing (left or right hand, regular or reverse bevel), backset, and whether you need it keyed into an existing system. Most of the mortise locks we sell accept standard or high-security cylinders, so you can upgrade key control without changing the lock body.

We carry Grade 1 commercial mortise locks from Marks USA, Sargent, Corbin Russwin, Yale, and others, including ornamental and storm-door mortise locks if your application is a gate or security screen door. If you're replacing an old mortise lock, send us a photo and measurements and we'll match it.

Mortise Lock

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  • Marks LifeSaver 5PDN/32D Hospital Passage Mortise Push/Pull Paddleset
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    Marks LifeSaver 5PDN/32D Hospital Passage Mortise Push/Pull Paddleset

    Marks USA
    MSRP: $633.00
    $614.03
    Installation Instructions with Template Our unique mortise hospital push/pull paddlesets feature universal assemblies where you can choose to install handles to point two-up or two-down or one-up...
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    MSRP: $633.00
    $614.03
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  • Marks Life Saver 5SS55N/32D Institutional Anti Ligature Passage Knob Mortise Lockset
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    Marks LifeSaver 5SS55N/32D Institutional Anti Ligature Passage Knob Mortise Lockset

    Marks USA
    MSRP: $1,027.00
    $996.21
    Performance Specifications Life Test: 1,500,000 cycles minimum. ANSI Test: Meets or exceeds all operational and security tests of ANSI specifications A156.13-2005 for series 5000, Grade 1. Trim...
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    MSRP: $1,027.00
    $996.21
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  • Marks USA 5NY10 Entrance Round Knob New Yorker Mortise Lock for Apartment Front Marks USA 5NY10 Entrance Round Knob New Yorker Mortise Lock for Apartment Back
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    Marks USA 5NY10 Entrance Round Knob New Yorker Mortise Lock for Apartment

    Marks USA
    $270.26 - $290.26
    The Marks USA 5NY10 is a mortise lock designed for apartment entrance doors where reliable security and ease of use matter. This reversible lock accommodates both left and right-hand doors, features...
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    $270.26 - $290.26
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  • Marks USA 6 Series Mortise Lock Bodies
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    Marks USA 6 Series Mortise Lock Body

    Marks USA
    $218.77 - $228.57
    The Marks USA 6 Series Mortise Lock Body is a commercial-grade locking mechanism designed for installers and security professionals who need reliable, heavy-duty access control. This cast alloy...
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    $218.77 - $228.57
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  • Marks USA 8 Series Mortise Lock Bodies
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    Marks USA 8 Series Mortise Lock Body

    Marks USA
    $218.77 - $228.57
    The Marks USA 8 Series is a heavy-duty mortise lock body designed for commercial and residential interior doors. It features a full 1-inch bolt throw with a reversible 1/2-inch latch, making it ideal...
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    $218.77 - $228.57
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  • Marks Metro Mortise Lockset 71A/3 Screw Knobs 1-1/4" x 8" Faceplate 2-3/4" Backset Marks Metro Mortise Lockset 71A/3 Screw Knobs 1-1/4" x 8" Faceplate 2-3/4" Backset
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    Marks USA 71A/3 Metro Mortise Lockset Screw Knobs

    Marks USA
    MSRP: $159.99
    $133.23
    The Marks USA 71A/3 is a residential-grade mortise lockset designed for entry doors requiring reliable security and durability. This mortise lock combines a deadbolt with a latch mechanism, making it...
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    MSRP: $159.99
    $133.23
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  • Marks New Yorker Grade 1 Mortise Lock Knob 9NY10A Marks New Yorker Grade 1 Mortise Lock Knob 9NY10A
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    Marks USA 9NY10A New Yorker Grade 1 Mortise Lock

    Marks USA
    MSRP: $308.00
    $241.25
    The Marks USA 9NY10A is a commercial-grade mortise lockset designed for interior doors in office buildings, hotels, and multi-tenant facilities. Its cast zamac body with baked enamel finish resists...
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    MSRP: $308.00
    $241.25
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  • Marks Knob Assembly kit for UniLock K21AC/3 Front Marks Knob Assembly kit for UniLock K21AC/3 Back
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    Marks Knob Assembly kit for UniLock K21AC/3 Mortise Lock For Security Door & Storm Door

    Marks USA
    MSRP: $122.00
    $91.11
    This knob assembly kit from Marks USA provides replacement or upgrade knobs for the K21AC/3 mortise lockset, ideal for ornamental iron doors, security doors, and storm doors. The bright brass finish...
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    MSRP: $122.00
    $91.11
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  • Marks Ornamental Iron Mortise Locksets Int/Ext Knob/Rose Kit K22/3 Marks Ornamental Iron Mortise Locksets Int/Ext Knob/Rose Kit K22/3
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    Marks K22 Knob Replacement Kit For Marks 22AC/3 Mortise Lock

    Marks USA
    MSRP: $71.00
    $51.65
    Broken or worn knobs on a Marks iron door lock do not mean replacing the whole lockset. This K22 knob and rose kit replaces the exterior and interior knobs on the Marks 22AC/3 ornamental iron mortise...
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    MSRP: $71.00
    $51.65
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  • Marks - Ornamental Iron Lever Mortise Lockset 9225AC/3 Marks - Ornamental Iron Lever Mortise Lockset 9225AC/3
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    Marks USA 9225AC Ornamental Iron Lever Mortise Lock

    Marks USA
    MSRP: $341.00
    $259.63
    The Marks USA 9225AC is a mortise lock designed for security doors, storm doors, and screen doors. It solves the need for reliable, durable entry hardware on ornamental iron installations. This...
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    MSRP: $341.00
    $259.63
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  • Marks - Thinline Mortise Lockset 2750 Series Double Cylinder Marks - Thinline Mortise Lockset 2750 Series Single Cylinder
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    Marks Lock Thinline Mortise Lockset 2750 Series For Storm Door & Screen Door

    Marks USA
    MSRP: $220.00
    $159.66
    The Marks Thinline 2750 is the slim version of the company's iron door mortise locks, made for storm and screen doors whose stiles are too narrow even for a standard 22AC body. If your aluminum storm...
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    MSRP: $220.00
    $159.66
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  • Marks Metro Mortise Lockset 114 Series Marks Metro Apartment Mortise Lockset 114 Series
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    Marks Metro Apartment Mortise Lockset 114 Series

    Marks USA
    $106.82
    The Marks USA 114 Series is a mortise lockset designed for apartment and multi-family residential doors. This thru-bolted assembly integrates knob and plate components with the lock body for secure...
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    $106.82
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