Corbin Russwin ML2055 Grade 1 ...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$1,566.92
$844.31
Corbin Russwin Corbin Russwin ML2055 Mortise Classroom Lever Lockset COR-ML2055-KEYED

Corbin Russwin ML2055 Grade 1 Mortise Classroom Lever Lockset

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Model: COR-ML2055-NSA-626
From the ML2000_Series Collection
$1,566.92
$844.31
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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

In Stock (leaves warehouse same day if ordered before 3pm ET)

$1,566.92
$844.31
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Corbin Russwin ML2055-KEYED Classroom Mortise Lever Lockset Grade 1, Field Reversible, 10-Year Warranty

ANSI F05 Classroom Function Mortise Lock for High-Traffic Commercial & Institutional Applications

The Corbin Russwin ML2055-KEYED is a Grade 1 classroom mortise lever lockset from the ML2000 Series, engineered for demanding commercial, institutional, industrial, and government environments. Conforming to ANSI function F05, this lock allows latchbolt retraction by grip from either side unless the outside grip is locked by key, with the inside grip always remaining free for safe egress. Constructed of heavy-gauge steel with a 1" stainless steel deadbolt and patented Quick Reversible latchbolt, the ML2055-KEYED is designed for 1-3/4" (44mm) standard door thickness and features field-reversible handing for flexible installation. The ML2000 Series has been UL cycle tested above and beyond requirements, completing 14.5 Million Cycles (Verification ID: V875753), and is backed by a 10-year limited warranty.

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

Why Choose Corbin Russwin Quality?

Corbin Russwin ML2000 Series mortise locks deliver professional-grade reliability through heavy-gauge steel construction, a 1" stainless steel deadbolt, and a patented Quick Reversible latchbolt — all UL cycle tested to an exceptional 14.5 Million Cycles (Verification ID: V875753). Every ML2055-KEYED is backed by a 10-year limited warranty, providing lasting confidence for facility managers and security professionals. Engineered for the most demanding commercial, institutional, and government applications where dependable performance and life safety 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:
F05
Product Subgroup:
Mortise Locks and Trim
Product Type:
Mortise Locks
Keyed:
Yes
Commercial/Residential:
Commercial
Function Description:
Latchbolt by grip either side, unless outside grip is locked by key outside Latchbolt by key when outside grip locked.
Lock Type:
Mortise
Handle Type:
Lever
Lock Function:
Classroom
Product Attribute:
Mortise Locks
Electronic:
No
Product Model:
ML2055
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-ML2055-NSA-626 – Frequently Asked Questions

1) What is the ML2055 classroom mortise lock designed for?
The ML2055 classroom mortise lock provides secure classroom functionality. Outside lever is locked by inside turn button or key. Emergency key unlocking from outside is always available. Meets classroom security requirements.
2) What door thickness does the ML2055 accommodate?
Standard ML2055 fits doors 1-3/4" to 2-1/4" thick. Check manufacturer specifications for exact compatibility. Verify door weight capacity matches lock requirements.
3) How do I determine the correct handing for this lock?
Stand outside the door. If hinges are on right and door swings away, order RH. If hinges on left and swings away, order LH. Classroom locks require proper handing for correct operation.
4) What finish options are available for the ML2055?
Common finishes include satin chrome, bright brass, and oil rubbed bronze. Verify specific finish availability when ordering. Match existing hardware for consistent appearance.
5) What grade rating does this mortise lock have?
Corbin Russwin ML series typically meets Grade 1 commercial standards. Provides heavy-duty performance for institutional applications. Verify specific grade requirements for your project.
6) Does the ML2055 meet fire door requirements?
Check manufacturer specifications for fire rating compatibility. Mortise locks can be used on fire doors when properly listed. Verify local code requirements before installation.
7) What cylinder type does the ML2055 use?
Uses standard mortise cylinder with cam tailpiece. Order cylinders separately to match existing keying system. Verify cylinder length for proper door thickness.
8) What is the standard backset for this lock?
Standard backset is typically 2-3/4". Some models offer adjustable backsets. Measure existing door preparation or check manufacturer template for exact requirements.
9) How do I adjust the ML2055 after installation?
Adjust latch bolt extension and strike alignment for proper operation. Turn button should lock outside lever completely. Lubricate moving parts with manufacturer-approved lubricants only.
10) What other ML series functions are available?
Corbin Russwin offers various ML functions including entrance, privacy, passage, and storeroom. Browse our Corbin Russwin section for complete ML series options.
11) Can this lock be used on exterior doors?
Classroom function is designed for interior use. For exterior applications, consider entrance or storeroom functions. Check weather resistance ratings if exposure to elements is possible.
How fast can I get the Corbin Russwin COR-ML2055-NSA-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-ML2055-NSA-626 come with a warranty?
Absolutely. The Corbin Russwin COR-ML2055-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 COR-ML2055-NSA-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-ML2055-NSA-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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Product Reviews

  • 4
    Corbin Russwin ML2055 class room mortise lock

    Posted by Terry on Jan 13th 2025

    Good lock that will last for years

!