Corbin Russwin ML2055 Grade 1 ...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$1,189.40
$758.40
Corbin Russwin ML2055 Single Cylinder Classroom Mortise Lock with Wrought Lustra Lever, Less Cylinder

Corbin Russwin ML2055 Grade 1 Single Cylinder Classroom Mortise Lock with Wrought Lustra Lever, Less Cylinder

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Model: ML2055LWM613LC
From the ML2000_Series Collection
$1,189.40
$758.40
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Selected Lever Type is
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$1,189.40
$758.40
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Corbin Russwin ML2055-LC Single Cylinder Classroom Mortise Lock with Wrought Lustra Lever, Less Cylinder

Grade 1 Commercial Classroom Mortise Lock — ML2000 Series Professional Security Solution

The Corbin Russwin ML2055-LC is a Grade 1 single cylinder classroom mortise lock from the ML2000 Series, engineered for demanding commercial, institutional, industrial, and government applications. Constructed of heavy-gauge steel with a 1" stainless steel deadbolt and patented Quick Reversible latchbolt, this lockbody is designed for 1-3/4" (44mm) standard door thickness and features field-reversible handing for flexible installation. The included ANSI straight lip strike measures 4-7/8" (124mm) x 1-1/4" (32mm) x 1-1/8" (29mm) lip to center, and the Wrought Lustra lever trim is supplied less cylinder to accommodate new or existing Corbin Russwin key systems or cylinders from most other manufacturers.

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 Classroom Environments
  • Commercial Office Buildings
  • Healthcare Institutions and Medical Facilities
  • Hotels and Hospitality Properties
  • Government and Municipal Buildings
  • Industrial and Warehouse Facilities
  • Multi-Tenant Residential and Mixed-Use Properties

Why Choose Corbin Russwin Quality?

Corbin Russwin ML2000 Series mortise locks deliver professional-grade reliability with heavy-gauge steel construction and a 1" stainless steel deadbolt, rated for an extraordinary 14.5 Million Cycles in UL testing (Verification ID: V875753). Backed by a 10-year manufacturer warranty and available in a wide variety of trim designs and finishes, the ML2055-LC is engineered for demanding commercial applications where dependable performance, security, and long-term value are essential.

Product Specs

Subcategory:
Mortise Locks
Product Group:
Mechanical Locks
Series:
ML2000 Series
Grade:
Grade 1
Standard Latch:
3/4" Latchbolt
Standard Strike:
ANSI straight lip standard, 4-7/8" x 1-1/4" x 1-1/8"
Product Subgroup:
Mortise Lock Bodies
Product Type:
Mortise Lockbody Only
Commercial/Residential:
Commercial
Function Description:
Mortise Lockbody Only
Lock Type:
Mortise
Lock Function:
Classroom
Segment:
Door Hardware
Product Attribute:
Mortise Locks
Electronic:
No
Product Model:
ML2055
Collection:
ML2000_Series
Product Function:
Corridor
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 ML2055LWM613LC – Frequently Asked Questions

1) Does the Corbin Russwin ML2055 classroom mortise lock come with a cylinder?
No. The ML2055-LC ships less cylinder, so you supply the cylinder separately. That is deliberate: it lets you key the lock into a new or existing Corbin Russwin key system, and it accepts cylinders from most other manufacturers. The standard Corbin Russwin cylinder for the series is brass with a 6-pin L4 keyway, 0-bitted. Budget a mortise cylinder plus the correct cam when you order.
2) What door thickness does the ML2055 mortise lock fit?
Standard build is for a 1-3/4 inch (44mm) door, which is the normal commercial thickness. Optional thicknesses are available within the ML2000 Series if your door is thicker, but the stock ML2055-LC is set up for 1-3/4 inches.
3) Do I have to order the ML2055 handed, or can I re-hand it on site?
Order it and re-hand it in the field. The ML2055 uses Corbin Russwin's patented Quick Reversible latchbolt, so handing reverses without opening the lock case. Handy if you are stocking one lock for a run of openings that swing both ways.
4) Will the ML2055 latch into the strike prep already in my frame?
It uses a 2-3/4 inch backset and a two-piece anti-friction latchbolt with 3/4 inch (19mm) throw, plus a 9/16 inch effective deadlocking auxiliary latch. The strike supplied is ANSI straight lip, 4-7/8 x 1-1/4 inches with 1-1/8 inch lip to center, which is the standard ANSI frame cutout, so an existing ANSI-prepped frame normally takes it directly. The mortise pocket needs to accept a 5-7/8 x 4 x 15/16 inch lockcase with an 8 x 1-1/4 inch armored front.
5) How does a classroom function mortise lock actually work on the door?
Classroom function means the outside lever is locked and unlocked by key from the outside only; the inside lever always retracts the latch for free egress. There is no inside button or thumbturn to lock it, so a student cannot secure the room. The ML2055 is single cylinder with a 1 inch stainless steel deadbolt, 1 inch throw, for when the room is secured after hours.
6) For a fire-rated classroom door, does the Corbin Russwin ML2055 or the Accentra 8800FL body carry the fire listing?
The Corbin Russwin ML2055 is UL/cUL listed to UL10C positive pressure and rated for 3-hour fire doors up to 4 ft x 10 ft single or 8 ft x 10 ft pair, and it also carries ANSI/BHMA A156.13 Series 1000 Grade 1 operational and security, ADA A117.1, and California State Fire Marshal listings. The Accentra 8800FL Series is a Grade 1 mortise lock body with field reversible handing. When a fire door assembly has to be documented for an inspector, the ML2055 gives you the specific UL10C and 3-hour door size language to submit.
7) What is a Grade 1 mortise lock body alternative to the Corbin Russwin ML2055 classroom lock?
The Accentra 8800FL Series mortise lock body is also an ANSI/BHMA Grade 1 mortise lock body with field reversible handing, which puts it in the same performance class as the Corbin Russwin ML2055. The difference in scope matters: the ML2055 is supplied as a classroom-function lock with Wrought Lustra lever trim and an ANSI straight lip strike measuring 4-7/8 inch x 1-1/4 inch x 1-1/8 inch lip to center, less cylinder, while the Accentra 8800FL is catalogued as a lock body with field reversible handing. If you need lever trim and strike in the same order, the ML2055 covers it; if you are replacing only the case behind existing Accentra trim, the 8800FL body is the closer match.
8) Can I swap an Accentra 8800FL mortise lock body into a door prepped for a Corbin Russwin ML2055?
Treat them as separate systems rather than a drop-in swap. Both are Grade 1 mortise lock bodies with field reversible handing, but the Corbin Russwin ML2055 is built around the ML2000 Series - its 2-3/4 inch backset, 5-7/8 inch x 4 inch x 15/16 inch heavy-gauge steel case, and hub-to-cylinder spacing of 3-5/8 inch center to center are what the existing trim and cylinder were bought to fit. If you are keeping the Corbin Russwin lever trim, thumbturn, or key system in place, stay with the ML2055 body. The Accentra 8800FL body is the right choice where the opening is already an 8800FL door with its own trim and prep.
9) Is the ML2055 durable enough for a high traffic school corridor?
It is built for that. Heavy-gauge steel lockcase, Grade 1 operational and security under A156.13, and UL cycle tested to 14.5 million cycles (Verification ID V875753). The anti-friction two-piece latchbolt also reduces the force needed to close the door, which matters on corridor doors with closers.
10) What trim comes on this ML2055 and can I match it to other doors in the building?
This configuration is the Lustra wrought lever (LW) on an M escutcheon in 613 Satin Bronze Oil-Rubbed. The ML2000 Series offers a wide range of other trim designs including Museo, Vineyard, and Behavioral Health (BHSS/BLSS), plus status indicator options on sectional and escutcheon trim, so you can match existing openings across a facility. Trim is thru-bolted for alignment and added security.
11) What is the cylinder and thumbturn spacing on the ML2055 escutcheon trim?
Center to center from knob/lever to cylinder is 3-5/8 inches (92mm), and lever to thumbturn is 2-7/16 inches (62mm). Those are the numbers to check against an existing escutcheon or door prep before you commit to a swap.
12) I only need the lock case, not the lever - is the ML2055 the wrong item?
If the lever trim and roses on the door are staying, a body-only item is the leaner purchase, and the Accentra 8800FL Series is sold as a Grade 1 mortise lock body with field reversible handing for exactly that situation. The Corbin Russwin ML2055 is a classroom-function assembly that arrives with Wrought Lustra lever trim on an M escutcheon in 613 Satin Bronze Oil-Rubbed, less cylinder - useful when you are also replacing worn trim or standardizing the look of a corridor, and redundant when you are not.
13) If I need a different lock function than classroom, do I have to change brands?
No. The Corbin Russwin ML2000 Series is multi-function - 12 functions are configurable from one ML2054 lockbody - so office, storeroom, or privacy openings on the same corridor can stay within the same series and share the 2-3/4 inch backset and ANSI strike prep. The Accentra 8800FL Series Grade 1 mortise lock body is the alternative path if the rest of the building is already standardized on that series. Function is the deciding factor here, not grade, since both are Grade 1.
14) Can I change the function later if the room use changes?
Within limits, yes. The ML2000 lockbody platform supports 12 functions configurable from one ML2054 lockbody, so a locksmith can reconfigure rather than replace the case. For electrified openings, Motorized Electric Latch Retraction (MELR) is offered on the ML20900 series, not on this mechanical ML2055, which is non-electronic.
How fast can I get the Corbin Russwin ML2055LWM613LC 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 ML2055LWM613LC come with a warranty?
Absolutely. The Corbin Russwin ML2055LWM613LC 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 ML2055LWM613LC?
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
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