Corbin Russwin ML2073 Grade 1 ...
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Corbin Russwin Corbin Russwin ML2073 Mortise Classroom Security Lockset COR-ML2073-KEYED

Corbin Russwin ML2073 Grade 1 Mortise Classroom Security Lockset

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Model: COR-ML2073-NSA-626
From the ML2000_Series Collection
$1,525.00
$946.91
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  • Corbin Russwin ADDER-CORBIN RUSSWIN-[KEYING]=KD - Keyed Different ADDER-CORBIN RUSSWIN-[KEYING]=KD - Keyed Different
  • Corbin Russwin ADDER-CORBIN RUSSWIN-[KEYING]=KA - Keyed Alike ADDER-CORBIN RUSSWIN-[KEYING]=KA - Keyed Alike

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$1,525.00
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Corbin Russwin ML2073 Mortise Classroom Security Lockset | Grade 1, Field Reversible, 1-3/4" Door

Commercial-Grade Classroom Security Mortise Lock with Deadbolt Control and Patented Quick Reversible Latchbolt

The Corbin Russwin ML2073 is a Grade 1 mortise classroom security 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 lockset features a 3/4" latchbolt and a 1" stainless steel deadbolt, providing life safety and security in a single door prep. The field-reversible handing and patented Quick Reversible latchbolt allow reversal of hands without disassembling the lock case, making installation and reconfiguration straightforward. The ML2073 has been UL cycle tested above and beyond requirements, completing 14.5 million cycles (Verification ID: V875753), confirming its suitability for the most demanding environments including offices, schools, hospitals, hotels, and other high-use facilities.

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 option features stainless steel escutcheons with tapered edges and Torx® pin tamper-resistant screws, providing a vandal-resistant barrier suited for high-abuse environments. When paired with Corbin Russwin's patented high-security Pyramid or Access 3® cylinders, the ML2073 becomes a formidable barrier against unauthorized entry and tampering.

Why Choose Corbin Russwin Quality?

Corbin Russwin ML2000 Series mortise locks are constructed of heavy-gauge steel and have been UL cycle tested to an exceptional 14.5 million cycles (Verification ID: V875753), far exceeding standard requirements for Grade 1 commercial hardware. The ML2073 is backed by a 10 Year Limited warranty and delivers life safety and security in a single door prep, eliminating the need for a separate deadlock. Engineered for demanding commercial, institutional, and government applications where dependable classroom security performance is essential.

Product Specs

Subcategory:
Mortise Locks
Product Group:
Mechanical Locks
Series:
ML2000 Series
Grade:
Grade 1
Keyed Function:
Double Cylinder
Standard Cylinder:
Conventional 6-pin, L4 Keyway, 0 Bitted Keying
Standard Strike:
ANSI straight lip standard, 4-7/8" x 1-1/4" x 1-1/8"
Warranty:
10 Year Limited
ANSI/BHMA:
F02
Product Subgroup:
Mortise Locks and Trim
Product Type:
Mortise Locks
Keyed:
Yes
Latch Throw:
3/4" Latchbolt, 1" Deadbolt
Commercial/Residential:
Commercial
Function Description:
Latchbolt by grip from either side unless outside grip is locked by projection of deadbolt. Deadbolt thrown or retracted by key .
Lock Type:
Mortise
Lock Function:
Classroom Security
Product Attribute:
Mortise Locks
Electronic:
No
Product Model:
ML2073
Collection:
ML2000_Series
Product Function:
Classroom Security
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-ML2073-NSA-626 – Frequently Asked Questions

1) How does the Corbin Russwin ML2073 classroom security function actually work at the door?
The ML2073 is a classroom security function: the latchbolt retracts by grip from either side unless the outside grip is locked by throwing the deadbolt, and the deadbolt is thrown or retracted by key. It is a double cylinder arrangement, so a teacher can lock the classroom from inside with a key without stepping into the corridor. Because the deadbolt lives in the same mortise case as the latch, you get both in one door prep and no separate deadlock.
2) Will the ML2073 mortise lock fit a 1-3/4 inch door, and what about thicker doors?
1-3/4 inches (44mm) is the standard door thickness for the ML2073, which is the common commercial door thickness. Optional thicknesses are available from the ML2000 Series. Backset is 2-3/4 inches, so the mortise pocket and cylinder hole need to be cut at that standard commercial backset.
3) Will the ML2073 latch into the strike already in my frame?
The lock ships with an ANSI straight lip strike, 4-7/8 x 1-1/4 inches with 1-1/8 inch lip to center. The latchbolt throws 3/4 inch and the deadbolt throws 1 inch, so the existing frame prep has to accept both bolts. If your frame is cut for a standard ANSI 4-7/8 inch mortise strike with a deadbolt pocket, it drops in. A frame prepped only for a latch, with no deadbolt cavity, needs the pocket extended.
4) Do I have to order the ML2073 handed, or can it be reversed in the field?
Order it and re-hand it on site. The ML2073 is field reversible, using Corbin Russwin's Quick Reversible latchbolt, so the hand is changed without pulling the lock case apart. One exception to watch on the trim side: the Dirke (DS) lever is offered as a specific left hand or right hand lever, so that choice does need to match the opening.
5) Can I use the ML2073 on a fire rated classroom door?
Yes. The ML2073 is UL/cUL listed and UL10C positive pressure rated, good for 3 hour fire doors up to 4 ft x 10 ft single or 8 ft x 10 ft pair. It also meets ADA A117.1, carries California State Fire Marshal listing, and is windstorm/hurricane certified, which covers most K-12 and healthcare corridor openings.
6) What cylinder does the ML2073 come with, and can I key it into my existing Corbin Russwin system?
Standard is a brass conventional 6-pin cylinder in the L4 keyway, supplied 0-bitted. It can be set up on new or existing Corbin Russwin key systems, and the lock body also accepts most other manufacturers' cylinders. If you run interchangeable cores, order CL6 (LFIC 6-pin less core) or CL7 (LFIC 7-pin less core), or LC to take it less cylinder entirely and use what you already stock. Keying is ordered keyed different as standard, or keyed alike when several openings need to share a key.
7) What trim do I have to specify with the ML2073, and what are the rose and escutcheon sizes?
Three trim decisions go on the order. Lever style: Armstrong, Citation, Dirke, Essex, Lustra, Newport, Princeton or Regis. Rose or escutcheon: A rose at 2-1/4 inch diameter, F rose at 2-7/8 inch diameter, or M and N escutcheons. Then finish, from bright and satin brass, bright and satin bronze, oil-rubbed bronze (613 and 613E), bright and satin nickel, bright and satin chrome, bright and satin stainless, 722 black oxidized bronze, or BSP black suede powder coat. Escutcheon trim is what you want if you also need the locked/unlocked status indicator.
8) What is a comparable Grade 1 classroom mortise lock to the Corbin Russwin ML2073 from another manufacturer?
The Cal-Royal NM8070 is a heavy duty Grade 1 classroom mortise lockset with an auxiliary deadlatch for 1-3/4 inch doors, which lines up with the ML2073's Grade 1 classroom security function on a 1-3/4 inch door. The Marks USA LA318GJ is another Grade 1 classroom security mortise lockset for 1-3/4 inch doors, supplied with an ANSI strike and a steel escutcheon 8-1/2 inch H x 2-3/4 inch W x 7/16 inch. The ML2073 differs in that it is a double cylinder classroom security function with a 1 inch stainless steel deadbolt in addition to the 3/4 inch latchbolt.
9) I do not need the deadbolt - what mortise lock should I use instead of the ML2073?
The ML2073 carries a 1 inch stainless steel deadbolt thrown or retracted by key alongside its 3/4 inch latchbolt, so if the opening only needs keyed latch control, a storeroom or office function lock is the closer fit. The Cal-Royal NM8080 is a Grade 1 storeroom mortise lockset for 1-3/4 inch doors with an interchangeable core option, and the NM8050 is a Grade 1 office/entrance mortise lockset with an auxiliary deadlatch for the same door thickness. The Accentra 8805FL is a Grade 1 storeroom mortise lock from the 8800 Series supplied with an Arcadia lever.
10) Is the BEST 45HCA intruder lockbody an alternative to the ML2073 for a classroom lockdown?
They solve the lockdown differently. The BEST 45HCA is a heavy duty mortise lockbody with an intruder function, which locks the outside lever from inside the room. The ML2073 is a classroom security function where the outside grip is locked by projection of the deadbolt and the deadbolt is thrown or retracted by key, so lockdown is performed with a key on either side of the door. Note also that the 45HCA is supplied as a lockbody, while the ML2073 is ordered as a complete lockset with lever and rose or escutcheon trim selected.
11) Is the ML2073 heavy duty enough for a high traffic school corridor?
It is ANSI/BHMA A156.13 Series 1000, Operational and Security Grade 1, which is the top commercial rating for mortise locks, and it matches ANSI function F02. The lock case is heavy-gauge steel at 5-7/8 x 4 x 15/16 inches and the deadbolt is one-piece stainless. Corbin Russwin ran it to 14.5 million UL test cycles (Verification ID V875753), well past the Grade 1 requirement.
12) Mortise classroom security lock or a cylindrical classroom lock: which should I use on a school corridor door?
Use a mortise lock like the ML2073 where the door sees constant traffic and you want a deadbolt and latch in one prep. The mortise case pockets into the door edge at a 2-3/4 inch backset and carries the 1 inch stainless deadbolt that locks out the outside lever, which a cylindrical lock cannot do. A cylindrical lock only needs bored holes, so it is the cheaper retrofit on doors already bored for one, but you get no deadbolt and less abuse resistance.
13) What else could I buy instead of the Corbin Russwin ML2073 for a classroom opening?
Staying mechanical, the Cal-Royal NM8070 is a heavy duty Grade 1 classroom mortise lockset for 1-3/4 inch doors, and the Marks USA LA318GJ is a Grade 1 classroom security indicator mortise lockset, also 1-3/4 inch, with an ANSI strike and steel escutcheon if you want visible lock status. If the requirement is credential based rather than key based, TownSteel's FME-2000 is a Grade 1 classroom mortise lockset with RFID, and the FME-4000 adds an electronic intruder classroom function. Alarm Lock's DL3500CR is a Grade 1 keypad classroom mortise lock, but it fits 1-5/8 to 1-7/8 inch doors, so check the leaf.
14) I need a whole building of Corbin Russwin mortise locks with different functions. Do I have to stock different lock bodies?
No. The ML2000 Series is multi-function: 12 functions are configurable from a single ML2054 lockbody, so a maintenance shop can carry one case and set it for classroom security, office, storeroom and the rest as openings change. Trim, finish and cylinder stay consistent across the building.
15) How much space does the ML2073 need between the lever and the cylinder and thumbturn?
Center to center from the knob or lever to the cylinder is 3-5/8 inches (92mm), and knob or lever to thumbturn is 2-7/16 inches (62mm). The armored front is 8 x 1-1/4 inches. Those are the numbers that matter when you are checking an existing door prep or laying out a new template.
16) I need access control on the ML2073 opening - what electrified mortise lock covers that?
The ML2073 itself is a mechanical lock. For an electrified mortise on the same type of opening, the Command Access ML190 is a heavy duty motorized mortise lock with field selectable EL/EU operation, storeroom function and 24VDC power, and the Schlage L9092EU with 03A trim is a heavy duty electric lock/unlock outside lever mortise lock for 1-3/4 inch doors with request to exit and 12/24VDC operation. The BEST 45HW is a heavy duty wired electromechanical mortise lock with 12V/24V operation.
17) For a behavioral health or patient room door, is the ML2073 the right mortise lock?
The ML2073 offers Behavioral Health trim designs (BHSS/BLSS) within its trim range, so it can be specified for those openings when a keyed classroom security function is required. Where the opening calls for a non-keyed ligature resistant set instead, the TownSteel MRX-L-01 is a Grade 1 heavy duty stainless steel anti-ligature lever mortise lockset in passage function for 1-3/4 inch doors, the MRX-A-01 is the same passage function with arch trim, and 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.
18) Which mortise lock do I order for a non-keyed door on the same project as the ML2073?
The ML2073 is keyed on both sides, so for passage, privacy or dummy openings on the same job you would spec a different function. The Falcon MA101 is a Grade 1 heavy duty field reversible mortise passage lock with a fire rating, the Schlage PM010 is a Grade 1 non-keyed passage latch mortise lock for 1-3/4 inch doors, the Cal-Royal NM8440 is a Grade 1 privacy mortise lockset with deadbolt for 1-3/4 inch doors, and the Schlage L0170 is a Grade 1 half dummy mortise lever trim for 1-3/4 inch doors.
19) What is the difference between the ML2073 and a Baldwin 6310 mortise lock body?
Backset and trim scope are the main separators. The Baldwin 6310 entry/storeroom mortise lock body uses a 2-1/2 inch backset and is listed for doors 1-3/8 inch and over, and the 6301 entry/apartment body is also 2-1/2 inch backset for doors 1-3/4 inch and over. The ML2073 uses a 2-3/4 inch backset on a 1-3/4 inch door and is a classroom security function with a key-operated deadbolt, which is a different door prep than the Baldwin bodies.
20) Is there a vandal resistant or behavioral health version of the ML2073?
Both exist within the ML2000 family. The ML2000VR vandal resistant option uses stainless steel escutcheons with tapered edges and Torx pin tamper-resistant screws for high-abuse areas, and it pairs with Corbin Russwin's Pyramid or Access 3 high-security cylinders. For behavioral health openings, BHSS and BLSS trim designs are offered alongside the Museo and Vineyard designs. If your requirement is a full anti-ligature lockset, TownSteel's MRX-L and MRX-A Grade 1 mortise locksets are built for that, though they are passage function.
21) Does the Kaba Ilco 185 Series work in place of the ML2073?
No. The Kaba Ilco 185 Series is a deadbolt function mortise lock supplied with no handing, so it provides bolt throw only. The ML2073 is a handed but quick reversible classroom security lockset that carries both a 3/4 inch latchbolt and a 1 inch deadbolt, with lever trim in nine designs and four rose or escutcheon choices. The 185 Series would only be a match if the opening needs a bolt and nothing else.
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Does the Corbin Russwin COR-ML2073-NSA-626 come with a warranty?
Absolutely. The Corbin Russwin COR-ML2073-NSA-626 is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
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