Corbin Russwin ML2003 Grade 1 ...
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$1,566.92
$796.91
Corbin Russwin ML2003 Mortise Classroom Lockset

Corbin Russwin ML2003 Grade 1 Mortise Classroom Lockset

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Model: ML2003 NSA 626
From the ML2000_Series Collection
$1,566.92
$796.91
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Corbin Russwin ML2003-KEYED ML2000 Series Grade 1 Mortise Classroom Lock with Field Reversible Latchbolt

Commercial-Grade Classroom Security with Patented Quick Reversible Latchbolt Technology

The Corbin Russwin ML2003-KEYED is a Grade 1 mortise classroom lockset from the ML2000 Series, engineered for high-traffic commercial, institutional, industrial, and government applications. Designed for 1-3/4" (44mm) standard door thickness, this classroom-function lock allows the outside grip to be locked or unlocked by key, while the inside grip remains always free for safe egress. The lockbody is constructed of heavy-gauge steel and features a patented Quick Reversible latchbolt and a 1" stainless steel deadbolt, with an auxiliary latch that automatically deadlocks the latchbolt for enhanced security. The standard ANSI straight lip strike measures 4-7/8" (124mm) x 1-1/4" (32mm) x 1-1/8" (29mm) lip to center, and handing is fully field reversible without disassembling the lock case.

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

  • K-12 Schools and Educational Facilities
  • College and University Campus Buildings
  • Healthcare Institutions and Hospitals
  • Commercial Office Buildings
  • Government and Municipal Buildings
  • Hotels and Hospitality Properties
  • Industrial and Institutional Facilities

Tamper-Resistant Design

The ML2000VR (Vandal Resistant) Series variant features vandal-resistant stainless steel escutcheons with tapered edges and Torx® pin tamper-resistant screws, providing a formidable barrier against intrusion and abuse in high-risk environments. When paired with Corbin Russwin patented high-security Pyramid or Access 3® cylinders, any door becomes a significantly stronger barrier to unauthorized entry.

Why Choose Corbin Russwin Quality?

Corbin Russwin ML2000 Series mortise locks deliver professional-grade reliability backed by heavy-gauge steel construction and a patented Quick Reversible latchbolt with a 1" stainless steel deadbolt, rated to an extraordinary 14.5 Million Cycles in UL testing (Verification ID: V875753). The ML2003-KEYED carries a 10 Year Limited warranty and achieves Grade 1 performance, making it the trusted choice for offices, schools, hospitals, hotels, and other demanding high-use commercial applications where dependable security and long-term performance are essential.

Product Specs

Subcategory:
Mortise Locks
Product Group:
Mechanical Locks
Series:
ML2000 Series
Grade:
Grade 1
Keyed Function:
Single Cylinder
Standard Cylinder:
Conventional 6-pin, L4 Keyway
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
ANSI/BHMA:
F04
Product Subgroup:
Mortise Locks and Trim
Product Type:
Mortise Locks
Keyed:
Yes
Commercial/Residential:
Commercial
Function Description:
Latchbolt by key when outside grip locked by toggle action stop. Latchbolt by grip either side, unless outside grip is locked by toggleaction stop.
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 Substrate:
Brass or Bronze
Product Category:
Mechanical Locks
Department:
Door Hardware

Corbin Russwin ML2003 NSA 626 – Frequently Asked Questions

1) Will the Corbin Russwin ML2003 classroom lock fit a 1-3/4 inch door with a 2-3/4 inch backset prep?
That is exactly the prep the ML2003 is built for: 1-3/4 inch (44mm) door thickness with a 2-3/4 inch (70mm) backset, which is the standard commercial mortise prep. The lockcase measures 5-7/8 x 4 x 15/16 inches and the armored front is 8 x 1-1/4 inches, so it drops into a standard ANSI mortise pocket. Optional door thicknesses are available if your doors run thicker than 1-3/4 inches.
2) How does a classroom function mortise lock actually work when someone is inside the room?
The inside lever is always free, so anyone in the room can get out whether the door is locked or not. Outside, the lever is locked or unlocked by key only, using a toggle-action stop in the lock case: key it to locked and the outside lever stays rigid until someone keys it back. The latchbolt still retracts by key from outside at any time. That means the teacher has to step into the corridor with a key to secure the room, which is the trade-off with classroom function.
3) Do I have to order the Corbin Russwin ML2003 handed, or can I re-hand it on site?
Order it and re-hand it in the field. The ML2003 uses Corbin Russwin's patented Quick Reversible latchbolt, so handing is reversed without taking the lock case apart, which is why it is catalogued as field reversible. Useful if you are stocking classroom locks for a building with doors swinging both ways, since one part number covers the openings.
4) Will the ML2003 latch into the strike already in my frame?
The 3/4 inch (19mm) throw two-piece anti-friction latchbolt is standard for commercial mortise locks, and the lock ships with an ANSI straight lip strike measuring 4-7/8 x 1-1/4 inches with 1-1/8 inch lip to center. If your frame already has an ANSI 4-7/8 inch mortise strike cutout, the new strike drops straight in. There is also a 9/16 inch effective throw auxiliary latch that deadlocks the main latchbolt, and a separate 1 inch throw stainless deadbolt that needs its own strike pocket in the frame.
5) Can I put a Corbin Russwin ML2003 on a 3-hour fire rated classroom door?
Yes. The ML2003 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 ANSI/BHMA A156.13 Series 1000 at Operational and Security Grade 1, is ADA A117.1 compliant, and is listed by the California State Fire Marshal. For a school or hospital corridor opening that has to pass inspection, those are the three lines the AHJ asks for.
6) Will the ML2003 work with my existing Corbin Russwin master key system, or do I have to key it separately?
It takes new or existing Corbin Russwin key systems, and it also accepts most other manufacturers' cylinders, so it can go into a facility already keyed to another brand. Standard is a conventional 6-pin brass cylinder in the L4 keyway, supplied 0-bitted, meaning your locksmith pins it to your system rather than you living with a factory key. Single cylinder, keyed outside only.
7) What other Grade 1 classroom mortise locks could I use instead of the Corbin Russwin ML2003?
For a straight mechanical swap, the Cal-Royal NM8070 is a Grade 1 classroom mortise lockset with auxiliary deadlatch, also specced for 1-3/4 inch doors. If you want credentials rather than keys on the same 1-3/4 inch prep, TownSteel's FME-2000 Series is a Grade 1 heavy duty classroom mortise lockset with RFID, and the FME-4000 Series adds electronic intruder classroom function for lockdown from inside the room. The Alarm Lock DL2700CR and DL3500CR Trilogy locks are Grade 1 keypad classroom mortise locks, but they are built for 1-5/8 to 1-7/8 inch doors, so check your door thickness before swapping one in.
8) I need a lockdown lock that a teacher can secure from inside the classroom. Is the ML2003 the right one?
No. Classroom function on the ML2003 locks the outside lever by key only, so someone has to open the door and key it from the corridor to secure the room. If your district requires inside lockdown, look at the TownSteel FME-4000 Series, an electronic intruder classroom mortise lockset, or the BEST 45HCA heavy duty mortise lockbody with intruder function. If the key-from-the-corridor sequence is acceptable to your safety plan, the ML2003 is the durable mechanical answer.
9) What mortise lock should I use on a behavioral health door instead of a lever classroom lock?
The Corbin Russwin ML2003 offers Behavioral Health BHSS and BLSS trim within its trim range, alongside standard lever designs. Where a full anti-ligature set is required, the TownSteel MRX-A-01 is a Grade 1 heavy duty ligature resistant arch trim mortise lockset in satin stainless steel and the MRX-L-01 is a Grade 1 heavy duty anti-ligature lever mortise lockset in stainless steel, both passage function for 1-3/4 inch doors. The Marks USA 5PDN is a Grade 1 hospital passage mortise push/pull paddleset that is ligature resistant and ADA compliant in satin stainless steel. All three are passage function, so they do not provide the keyed classroom control the ML2003 gives.
10) What is the closest Grade 1 mortise classroom lock to a Corbin Russwin ML2003 from another manufacturer?
The Cal-Royal NM8070 is a heavy duty Grade 1 classroom mortise lockset with an auxiliary deadlatch, built for 1-3/4 inch doors, which is the same door thickness the ML2003 is designed around. Both are keyed classroom function mortise locks in Grade 1, so the NM8070 covers the same opening type when a mechanical classroom lock is called for. The ML2003 differs in that its handing is field reversible and it takes a conventional 6-pin L4 keyway cylinder as standard.
11) Which mortise lock should I use if I need a classroom door with keypad access instead of a key?
The Corbin Russwin ML2003 is a mechanical, non-electronic lock keyed with a conventional 6-pin L4 cylinder. For credential-based entry on a classroom door, the Alarm Lock DL3500CR Trilogy is a Grade 1 electronic classroom mortise lock with 300 user codes, and the DL2700CR Trilogy T2 is a Grade 1 electronic classroom mortise lock with a weatherproof design. Both Trilogy models are built for 1-5/8 to 1-7/8 inch doors, so confirm the door thickness before substituting; the ML2003 is specified for 1-3/4 inch doors.
12) Is a storeroom mortise lock the same thing as a classroom mortise lock?
No. On the Corbin Russwin ML2003 the outside grip is locked or unlocked by a toggle action stop and retracts the latchbolt by key when locked, so a teacher can secure the door and later restore free entry. A storeroom function keeps the outside lever permanently locked with entry by key only every time. If that is the behavior needed, the Accentra 8805FL is a Grade 1 storeroom mortise lock in the 8800 Series with an Arcadia lever, and the Cal-Royal NM8080 is a Grade 1 storeroom mortise lockset with an interchangeable core option for 1-3/4 inch doors.
13) What do I order for a classroom door that also needs to be locked down from inside the room?
The Corbin Russwin ML2003 is a single cylinder classroom lock: the outside grip is locked by key or toggle action stop, and the inside grip stays free. For lockdown initiated from inside the classroom, the BEST 45HCAINL is a heavy duty mortise lockbody with intruder function, and the TownSteel FME-4000 Series is a Grade 1 heavy duty electronic intruder classroom mortise lockset with RFID technology for 1-3/4 inch doors.
14) Can I use a Baldwin 6310 mortise lock in place of a Corbin Russwin ML2003?
Not as a direct swap. The Baldwin 6310 is an entry/storeroom mortise lock body with a 2-1/2 inch backset, offered knob by knob, while the 6310190RRLS is the right hand reverse lever by lever version; both are cut for a 2-1/2 inch backset. The Corbin Russwin ML2003 uses a 2-3/4 inch backset, so the mortise pocket and cylinder location will not line up with a Baldwin 6300 prep. The Baldwin 6301 entry/apartment body shares that same 2-1/2 inch backset.
15) What mortise lock do I use if the classroom door has to unlock from an access control panel?
The Corbin Russwin ML2003 is a mechanical lock with no electrical operation. For panel-controlled openings, the Command Access ML190 Series is a heavy-duty motorized mortise lock with field selectable EL/EU operation on 24VDC in storeroom function, the BEST 45HW is a heavy duty wired electromechanical mortise lock with 12V/24V operation, and the Schlage L9092EU with 03A trim is a heavy duty electric lock/unlock outside lever mortise lock, keyed outside, with request to exit on 12/24VDC for 1-3/4 inch doors.
16) What do I need to specify when ordering a Corbin Russwin ML2003 mortise lockset?
Four things settle the order. Lever design: Armstrong (AS), Citation (CS), Dirke (DS, ordered left hand or right hand), Essex (ES), Lustra (LS), Newport (NS), Princeton (PS) or Regis (RS). Trim style: A rose at 2-1/4 inch diameter, F rose at 2-7/8 inch diameter, or M or N escutcheon. Finish, from 605 bright brass through 626 satin chrome, 630 satin stainless, 722 black oxidized bronze oil-rubbed and BSP black suede powder coat. And your keying, since the cylinder ships 0-bitted. Handing you can leave alone, the latchbolt reverses in the field.
17) Is a mortise classroom lock like the ML2003 worth it over a cylindrical classroom lock?
On a classroom or corridor door that gets hammered all day, the mortise case buys you durability and a deadbolt in the same pocket. The ML2003 lockcase is heavy-gauge steel with a 1 inch throw stainless deadbolt alongside the 3/4 inch latchbolt, and it was cycle tested to 14.5 million cycles. The catch is the prep: a mortise pocket has to be routed into the door edge, so if your doors are bored for a cylindrical lock you are either replacing doors or moving to a cylindrical product. Schlage's PC Series is the cylindrical route where the door prep will not change.
18) Can I see at a glance whether a Corbin Russwin ML2000 classroom door is locked?
Status indicator options are offered on the ML2000 Series for locked and unlocked visibility, available on both sectional and escutcheon trim, so you would pair it with an M or N escutcheon or a rose trim depending on the indicator you specify. If you want an indicator on a different brand, the Marks USA LA318GJ is a Grade 1 classroom security indicator mortise lockset with an ANSI strike and a steel escutcheon measuring 8-1/2 x 2-3/4 x 7/16 inches.
19) How much room do I need between the lever and the cylinder when laying out the mortise prep?
Center to center from the knob or lever to the cylinder is 3-5/8 inches (92mm), and lever to thumbturn is 2-7/16 inches (62mm) on the ML2000 Series. Those are the numbers that decide whether an escutcheon or a pair of roses lands right on the door face, and they are what you check against an existing prep before you commit to a retrofit.
20) Will the ML2003 hold up in a high school corridor or a hospital wing?
It is built for that traffic. Grade 1 operational and security under ANSI/BHMA A156.13, a heavy-gauge steel lockcase, and UL cycle testing to 14.5 million cycles (Verification ID V875753). Trim is thru-bolted, which keeps the roses and escutcheons aligned and makes them harder to pull off the door. The anti-friction two-piece latchbolt also takes less force to close, which matters on doors with closers that people slam all day.
21) Can I get a Corbin Russwin ML2000 mortise lock that unlocks from an access control system?
The ML2003 itself is a mechanical, non-electronic lock. Motorized Electric Latch Retraction (MELR) is offered on the ML20900 series if you need the latch pulled electrically. If you are wiring a mortise opening from another brand, the Command Access ML190 Series is a motorized mortise lock with field selectable fail-safe or fail-secure operation on 24VDC, and the BEST 45HW Series is a wired electromechanical mortise lock running 12V or 24V.
22) I need storeroom or office function instead of classroom on the same mortise prep. What changes?
Classroom function is what the ML2003 is; it is one of 12 functions Corbin Russwin configures from the ML2054 multi-function lockbody, so within the ML2000 Series you change the function, not the door prep. Across brands on the same 1-3/4 inch prep, the Cal-Royal NM8080 is Grade 1 storeroom with an interchangeable core option, the NM8050 is Grade 1 office/entrance with auxiliary deadlatch, and the NM8440 is Grade 1 privacy with a deadbolt. Accentra's 8805FL from the 8800 Series is a Grade 1 storeroom mortise lock with the Arcadia lever.
23) What replaces a classroom mortise lock on a door that does not need to lock at all?
Where the opening only needs latching, a passage mortise lock replaces the keyed Corbin Russwin ML2003. The Schlage PM010 is a Grade 1 non-keyed passage latch mortise lock for 1-3/4 inch doors, the Falcon MA101 is a Grade 1 heavy-duty mortise passage lock with field reversible operation and a fire rating, and the Hager 3810S and 3810E are Grade 1 passage mortise locks with a 2-3/4 inch backset, offered with rose and with escutcheon respectively, for doors 1-3/4 to 2-1/2 inch. The ML2003 also uses a 2-3/4 inch backset.
24) Which mortise lock should I specify for a dormitory corridor instead of a classroom lock?
The Corbin Russwin ML2003 is a classroom function lock, which leaves the inside grip always free and has no deadbolt operated from the room side. For dormitory corridor doors the Sargent 7925 is a Grade 1 heavy duty dormitory exit function mortise lock in the 7900 Series with rose trim and a single cylinder deadbolt.
25) What is the difference between the Corbin Russwin ML2003 and a TownSteel FME-2000 classroom mortise lock?
Both are Grade 1 classroom mortise locksets for 1-3/4 inch doors. The TownSteel FME-2000 Series is a heavy duty Grade 1 classroom mortise lockset that carries RFID technology for credential entry. The Corbin Russwin ML2003 is a mechanical, non-electronic lock keyed with a conventional 6-pin L4 keyway cylinder, with handing field reversible and lever trim available in Armstrong, Citation, Essex, Lustra, Newport, Princeton, Regis and Dirke styles.
26) I need a mortise lock for a restroom or patient room, not a classroom. What takes its place?
Privacy function is the one to order. The Cal-Royal NM8440 is a Grade 1 privacy mortise lockset with deadbolt for 1-3/4 inch doors, and the Hager 3840S is a Grade 1 privacy mortise lock with a 2-3/4 inch backset for doors 1-3/4 to 2 inch. The Corbin Russwin ML2003 is a keyed classroom lock whose outside grip is controlled by key or toggle action stop, which is not the behavior a restroom door needs.
27) Is an Emtek mortise entrance lockset an alternative to a Corbin Russwin ML2003?
No. The Emtek 3019 Brisbane, 3102 Memphis, 3104 Hamilton and 3106 Manhattan mortise entrance locksets are dummy function, meaning the trim is fixed and there is no latch or locking action behind it. The Corbin Russwin ML2003 is a keyed classroom lockset rated ANSI/BHMA Grade 1 for commercial use. Dummy trim suits an inactive leaf only.
28) Is a mortise deadbolt an alternative to a classroom mortise lock?
They do different jobs. The Corbin Russwin ML2003 combines a latchbolt operated by grip or key with a 1 inch stainless steel deadbolt in one lockcase. A mortise deadbolt has no latch and no lever: the Sargent 4874 is a double cylinder mortise deadbolt with a 2-3/4 inch backset, and the Kaba Ilco 185 Series is a deadbolt function mortise lock supplied with no handing. Those add a deadbolt to a door that already has separate latching hardware.
29) What is the alternative if the office door needs the lever left unlocked during business hours?
An office or entrance function fits that pattern better than the classroom function of the Corbin Russwin ML2003. The Cal-Royal NM8050 is a heavy duty Grade 1 office/entrance mortise lockset with an auxiliary deadlatch for 1-3/4 inch doors, matching the ML2003 door thickness, and the Hager 3850E is a Grade 1 office mortise lock with lever and escutcheon, non-keyed, on a 2-3/4 inch backset for doors 1-3/4 to 2-1/2 inch.
30) Can a cylindrical lock be substituted for the Corbin Russwin ML2003?
Only if the door is prepped for one. The ML2003 is a mortise lock whose heavy-gauge steel lockcase measures 5-7/8 inch by 4 inch by 15/16 inch and drops into a pocket routed in the door edge. The Schlage PC10 is a Grade 1 passage cylindrical lock with rose for 1-3/4 inch doors, which mounts through bored holes instead. A door prepped for a mortise pocket and one prepped for a cylindrical bore are not interchangeable without new door prep.
31) What finishes does the Corbin Russwin ML2003 come in for matching the rest of a building?
Fourteen finishes cover most existing hardware schedules: 605 bright brass, 606 satin brass, 611 bright bronze, 612 satin bronze, 613 satin bronze oil-rubbed, 613E dark oxidized satin bronze equivalent, 618 bright nickel, 619 satin nickel, 625 bright chrome, 626 satin chrome, 629 bright stainless, 630 satin stainless, 722 black oxidized bronze oil-rubbed, and BSP black suede powder coat. If your building is already standardized on 626 satin chrome or 630 satin stainless, those are the two commercial defaults and both are stocked here. Trim itself is brass or bronze substrate.
How fast can I get the Corbin Russwin ML2003 NSA 626 delivered?
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Can I return it if it doesn’t work for me?
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Does the Corbin Russwin ML2003 NSA 626 come with a warranty?
Absolutely. The Corbin Russwin ML2003 NSA 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 ML2003 NSA 626?
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