Corbin Russwin ML2003 Grade 1 ...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$676.75
$274.87
Corbin Russwin Corbin Russwin ML2003 Classroom - Mortise Lockbody Only COR-ML2003-LL

Corbin Russwin ML2003 Grade 1 Classroom - Mortise Lockbody Only

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Model: COR-ML2003-LL-626
From the ML2000_Series Collection
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$676.75
$274.87
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Corbin Russwin ML2003-LL Classroom Mortise Lockbody, Grade 1, Field Reversible, Heavy-Gauge Steel

Commercial-Grade Classroom Security with Patented Quick Reversible Latchbolt Technology

The Corbin Russwin ML2003-LL is a Grade 1 classroom mortise lockbody engineered for high-traffic commercial, institutional, industrial, and government applications. Designed for 1-3/4" (44mm) standard door thickness, this lockbody features a patented Quick Reversible latchbolt and a 1" stainless steel deadbolt constructed from heavy-gauge steel. The classroom function allows the outside grip to be locked or unlocked by key, while the inside grip remains always free, and the auxiliary latch deadlocks the latch for added security. The ML2003-LL is part of the ML2000 Series, which has been UL cycle tested to an exceptional 14.5 million cycles (Verification ID: V875753), making it an ideal choice for offices, schools, hospitals, hotels, and other demanding high-use environments.

Professional Features & Benefits

  • ANSI/BHMA Grade 1 mortise lock per A156.13 Series 1000, Operational and Security Grade 1
  • UL Cycle above and beyond: 14.5 Million Cycles (Verification ID: V875753)
  • Patented Quick Reversible latchbolt — reverse handing without disassembling the lock case
  • Multi-function capability: 12 functions configurable from one ML2054 lockbody
  • Heavy-gauge steel lockcase 5-7/8" x 4" x 15/16"; 1" stainless steel deadbolt, 1" throw
  • 3/4" (19mm) throw anti-friction two-piece latchbolt requires less force to close
  • Wide variety of trim designs including Muséo®, Vineyard™, Behavioral Health (BHSS/BLSS)
  • Status indicator options for locked/unlocked visibility (sectional and escutcheon trim)
  • Motorized Electric Latch Retraction (MELR) available for ML20900 series
  • Thru-bolted trim designs for proper alignment and increased security
  • Can be used with new or existing Corbin Russwin key systems; accepts most other manufacturers' cylinders
  • UL/cUL listed, UL10C positive pressure; 3-hour fire door up to 4' x 10' single or 8' x 10' pair
  • Ten-year mechanical warranty; five-year MELR; two-year electrical

Technical Specifications

  • Grade: ANSI/BHMA A156.13 Series 1000, Operational and Security Grade 1
  • Handing: Handed; quick reversible — re-handed without disassembling the lock case
  • Door Thickness: 1-3/4" (44mm) standard; optional thicknesses available
  • Backset: 2-3/4" (70mm)
  • Lockcase: Heavy-gauge steel, 5-7/8" (149mm) x 4" (102mm) x 15/16" (24mm)
  • Armored Front: Wrought brass, bronze, or stainless steel, 8" x 1-1/4"
  • Latchbolt: 2-piece mechanical with anti-friction insert, 5/8" x 1" x 3/4" (19mm) throw
  • Auxiliary Latchbolt: 9/16" (14mm) effective throw; deadlocking
  • Deadbolt: One-piece stainless steel, 19/32" x 1-1/4" x 1" (25mm) throw
  • Strike: Wrought brass, bronze, or stainless steel, ANSI straight lip, 4-7/8" x 1-1/4" x 1-1/8" lip to center
  • Cylinder: Brass, 6-pin L4 keyway, 0-bitted standard
  • Spacing: C. to c. knob/lever to cylinder: 3-5/8" (92mm); knob/lever to thumbturn: 2-7/16" (62mm)
  • Certifications: ANSI/BHMA A156.13 Grade 1; UL/cUL UL10C 3-hour positive pressure; ADA A117.1; California State Fire Marshal; Windstorm/Hurricane certified
  • Warranty: Ten-year mechanical; five-year MELR; two-year electrical

Professional Applications

  • Educational Facilities and Classrooms
  • Commercial Office Buildings
  • Healthcare Institutions and Hospitals
  • Hotels and Hospitality Properties
  • Government and Municipal Buildings
  • Industrial and Institutional Facilities
  • Multi-Tenant Residential and Mixed-Use Properties

Tamper-Resistant Design

The ML2000VR (Vandal Resistant) Series option features stainless steel escutcheons with tapered edges and Torx® pin tamper-resistant screws, providing a vandal-resistant barrier against abuse and unauthorized manipulation. When paired with Corbin Russwin patented high-security Pyramid or Access 3® cylinders, the ML2003-LL becomes a formidable barrier to intruders in high-risk environments.

Why Choose Corbin Russwin Quality?

Corbin Russwin ML2000 Series mortise locks deliver professional-grade reliability with heavy-gauge steel construction and a patented Quick Reversible latchbolt, UL cycle tested to an outstanding 14.5 million cycles (Verification ID: V875753) — far exceeding standard requirements. Backed by a 10 Year Limited warranty, the ML2003-LL is engineered for demanding commercial applications in schools, hospitals, offices, and government facilities where dependable, long-term performance is essential.

Product Specs

Subcategory:
Mortise Locks
Product Group:
Mechanical Locks
Series:
ML2000 Series
Grade:
Grade 1
Keyed Function:
Non-Keyed
Standard Latch:
3/4" Latchbolt
Standard Strike:
ANSI straight lip standard, 4-7/8" x 1-1/4" x 1-1/8"
Warranty:
10 Year Limited
Product Subgroup:
Mortise Lock Bodies
Product Type:
Mortise Lockbody Only
Keyed:
No
Commercial/Residential:
Commercial
Function Description:
Mortise Lockbody Only
Lock Type:
Mortise
Lock Function:
Classroom
Product Attribute:
Mortise Locks
Electronic:
No
Product Model:
ML2003
Collection:
ML2000_Series
Product Function:
Classroom
Door Hand Direction:
Field Reversible
Door Thickness Range:
1-3/4"
Product Category:
Mechanical Locks
Product Substrate:
Brass or Bronze
Department:
Door Hardware

Corbin Russwin COR-ML2003-LL-626 – Frequently Asked Questions

1) Is the Corbin Russwin ML2003 a complete lockset or just the lock case?
Lock case only. The ML2003-LL is the mortise lockbody by itself, so trim (lever or knob, roses or escutcheon) and the cylinder are separate line items. Plan on ordering the trim design and a cylinder alongside it to finish the opening. The armored front is wrought brass, bronze, or stainless steel at 8 x 1-1/4 inches, and the standard strike is an ANSI straight lip 4-7/8 x 1-1/4 x 1-1/8 inch lip to center.
2) What does classroom function mean on a ML2003 mortise lock, and who can lock the door?
Classroom function means the outside lever or knob is locked and unlocked by key only, from the corridor side. The inside grip is always free to exit, so nobody can get trapped in the room. There is no inside button or turn, which is the point of the function: a teacher cannot leave the door locked by accident, and only a keyholder changes the state. The auxiliary latch deadlocks the latchbolt so the latch cannot be shimmed while the door is closed.
3) Will a Corbin Russwin ML2003 fit a 1-3/4 inch door with a 2-3/4 inch backset prep?
That is exactly the standard prep for it. The ML2003-LL is built for 1-3/4 inch (44mm) door thickness with a 2-3/4 inch (70mm) backset, and the steel lock case measures 5-7/8 x 4 x 15/16 inches, so the mortise pocket has to accept that case. Optional thicknesses are available if the door is thicker than 1-3/4. Center to center, the knob or lever to cylinder spacing is 3-5/8 inches (92mm) and lever to thumbturn is 2-7/16 inches (62mm), which is what has to line up with the holes already in the door face.
4) Do I have to order the ML2003 mortise lock handed, or can it be reversed in the field?
Order it and re-hand it on site. The ML2003 uses Corbin Russwin's patented Quick Reversible latchbolt, which flips the hand without opening the lock case. For a property manager stocking spares across a building, that means one lockbody covers both left and right hand openings instead of carrying two part numbers.
5) Will the ML2003 latch into my existing ANSI mortise strike?
In most cases yes, if the frame carries a standard ANSI mortise strike. The latchbolt is a two-piece anti-friction design with a 3/4 inch (19mm) throw, the auxiliary latchbolt has a 9/16 inch (14mm) effective throw, and the deadbolt is one-piece stainless steel with a 1 inch (25mm) throw. The strike supplied as standard is the ANSI straight lip at 4-7/8 x 1-1/4 inches with 1-1/8 inch lip to center. If the existing strike is that ANSI cutout, the bolts land where they should; if the frame has a non-ANSI or curved lip strike, expect to change the strike with the lock.
6) Can I use my existing keyway with a Corbin Russwin ML2003, or do I have to rekey the building?
The ML2003 lockbody ships non-keyed, so the cylinder is your choice. It works with new or existing Corbin Russwin key systems and accepts most other manufacturers' cylinders, which is what lets a facility drop it into a masterkey system already running on another brand. Corbin Russwin's own standard is a brass 6-pin L4 keyway supplied 0-bitted. For high-risk openings the patented Pyramid or Access 3 high-security cylinders are the option to specify.
7) Is the ML2003 mortise lock approved for a 3-hour fire rated door?
Yes, it is UL/cUL listed to UL10C positive pressure and carries a 3-hour fire door rating up to a 4 by 10 foot single door or an 8 by 10 foot pair. It also meets ADA A117.1, and carries California State Fire Marshal and windstorm/hurricane certification. For an institutional spec sheet, the grade line is ANSI/BHMA A156.13 Series 1000, Operational and Security Grade 1.
8) What is the cross-brand equivalent to a Corbin Russwin ML2003 mortise lock body?
The closest cross-brand match is the Accentra 8800FL Series Grade 1 mortise lock body. Both are Grade 1 mortise lock bodies, so a specifier working to an ANSI/BHMA Grade 1 mortise requirement can carry either. The ML2003 is a classroom function mortise lockbody in the ML2000 Series, keyed by the cylinder rather than supplied keyed, so the decision between them usually comes down to which key system and trim line the building is already standardized on.
9) If I want to stock one mortise lock body for both left and right hand doors, does the Corbin Russwin ML2003 or the Accentra 8800FL work?
Both do. The ML2003 is field reversible, and the Accentra 8800FL Series body is field reversible for handing as well, so either one covers left hand and right hand openings from a single shelf item. On the ML2003 the reversal is done with the patented Quick Reversible latchbolt, which re-hands the lock without disassembling the lock case. For a maintenance shop that wants one line item to cover every classroom door in a building, that removes handing from the ordering decision entirely.
10) Is a mortise lock like the ML2003 worth it over a cylindrical lock for a school corridor?
For a door that gets hit every period, yes. A mortise body sits in a pocket in the door edge and carries both a latchbolt and a separate 1 inch stainless deadbolt in one case, so you get a deadlocking latch plus a throw bolt without a second lock. The ML2000 Series has been UL cycle tested to 14.5 million cycles (Verification ID V875753). A cylindrical lock is cheaper to prep and quicker to install, so it is the better call on lower-traffic interior doors or where the door is not already mortise prepped. Changing an existing cylindrical door to mortise means a new door or a heavy edge prep, not a swap.
11) What is the alternative to a Corbin Russwin ML2003 lock body if I need a field reversible Grade 1 mortise body?
The Accentra 8800FL Series mortise lock body is the closest cross-brand match ZenSupply carries: Grade 1, sold as a body only, with field reversible handing like the ML2003. The deciding factor is usually the key system and the trim already on the building, since the ML2003 works with existing Corbin Russwin key systems and accepts most other manufacturers' cylinders. If the rest of the doors are Corbin Russwin trim, stay with the ML2003 so the trim and cylinder carry over.
12) Can I get a status indicator or a vandal resistant version of the ML2003 classroom lock?
Both are ordering options in the ML2000 Series. Status indicators showing locked/unlocked are offered on sectional and escutcheon trim, which is what a school wants for lockdown visibility from the corridor. The ML2000VR vandal resistant option uses stainless steel escutcheons with tapered edges and Torx pin tamper-resistant screws. Trim designs run to Museo, Vineyard, and Behavioral Health (BHSS/BLSS) for psychiatric and detention-type rooms. These are trim-level decisions made on top of the same lockbody.
13) Does the ML2003 do electric latch retraction, or do I need a different lock for access control?
Not this one. The ML2003-LL is a mechanical, non-electronic lockbody. Motorized Electric Latch Retraction is offered on the ML20900 series, so an opening that needs remote release or card access tied to latch retraction takes that model instead of the ML2003.
14) Is a Corbin Russwin ML2003 a drop-in replacement for an Accentra 8800FL lock body?
Treat them as alternates on the spec, not as parts that swap into each other's prep. Both are Grade 1 mortise lock bodies, but the ML2003 is built around the ML2000 Series case and trim system, with a 2-3/4 inch backset, a heavy-gauge steel case measuring 5-7/8 inch by 4 inch by 15/16 inch, and an 8 inch by 1-1/4 inch armored front. Existing trim, escutcheons, and armored fronts from one brand's mortise line should not be assumed to land on the other's case; verify the case pocket and the trim spacing before ordering a body alone.
15) What finishes does the Corbin Russwin ML2003 come in?
Twelve finishes: 605 bright brass, 606 satin brass, 611 bright bronze, 612 satin bronze, 613 satin bronze oil-rubbed, 618 bright nickel, 619 satin nickel, 625 bright chrome, 626 satin chrome, 629 bright stainless, 630 satin stainless, and 722 black oxidized bronze oil-rubbed. Since the lockbody buries in the door edge, the finish you are matching to the rest of the building is really the armored front and the trim you order with it. 626 satin chrome and 630 satin stainless are the two that match most existing commercial hardware.
16) Can one ML2000 lockbody cover more than one lock function if I standardize across a building?
Partly. The ML2003 itself is set up as classroom function. Where an MRO buyer wants one body on the shelf covering several openings, the ML2054 lockbody is the multi-function one, configurable to 12 functions from a single case. That is the stocking strategy for a facility running office, storeroom, and classroom doors off one part number.
How fast can I get the Corbin Russwin COR-ML2003-LL-626 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Corbin Russwin COR-ML2003-LL-626 come with a warranty?
Absolutely. The Corbin Russwin COR-ML2003-LL-626 is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Corbin Russwin COR-ML2003-LL-626?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
Why buy the Corbin Russwin COR-ML2003-LL-626 from ZenSupply?
ZenSupply makes it easy to get the commercial door hardware you need—fast shipping, expert support, and rewards on every order. Our team is always ready to help you choose the right product for your project.

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