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Corbin Russwin ML2055 Mortise Classroom Lever Lockset | Grade 1, Field Reversible, 10-Year Warranty
ANSI F05 Classroom Mortise Lock for High-Traffic Commercial & Institutional Applications
The Corbin Russwin ML2055 is a Grade 1 mortise classroom lever lockset from the ML2000 Series, engineered for demanding commercial, institutional, industrial, and government environments. Featuring ANSI function F05, this lockset allows the latchbolt to be operated by grip from either side unless the outside grip is locked by key — at which point the latchbolt is operated by key only — while the inside grip remains always free. Constructed of heavy-gauge steel with a 1" stainless steel deadbolt and a patented Quick Reversible latchbolt, the ML2055 accommodates a standard door thickness of 1-3/4" (44mm) and includes an ANSI straight lip strike measuring 4-7/8" (124mm) x 1-1/4" (32mm) x 1-1/8" (29mm) lip to center. The ML2000 Series has been UL cycle tested above and beyond requirements, completing 14.5 Million Cycles (Verification ID: V875753), making it an ideal choice for offices, schools, hospitals, hotels, and other high-use facilities.
Professional Features & Benefits
- ANSI F05 Classroom Function: Latchbolt operable by grip from either side unless outside grip is locked by key; inside grip always free, providing essential classroom security and safe egress at all times.
- Exceptional Durability — 14.5 Million Cycles: UL cycle tested above and beyond standard requirements at 14.5 Million Cycles (Verification ID: V875753), ensuring long-term reliability in the highest-traffic applications.
- Standard Door Thickness Compatibility: Designed for 1-3/4" (44mm) standard door thickness with an ANSI straight lip strike at 4-7/8" (124mm) x 1-1/4" (32mm) x 1-1/8" (29mm) lip to center for precise, code-compliant installation.
- Patented Quick Reversible Latchbolt: Field-reversible handing allows reversal of hands without disassembling the lock case, reducing installation time and simplifying field adjustments.
- Heavy-Gauge Steel Construction: Lockbody constructed of heavy-gauge steel with a 1" stainless steel deadbolt; auxiliary latch deadlocks the latchbolt for added security and resistance to forced entry.
- Grade 1 Commercial Performance: Meets the rigors of high-traffic commercial, institutional, industrial, and government applications, providing life safety and security in a single door prep — eliminating the need for a separate deadlock.
- Broad Cylinder Compatibility: Compatible with new or existing Corbin Russwin key systems and accepts cylinders from most other manufacturers, including Corbin Russwin patented high-security Pyramid or Access 3® cylinders for enhanced security.
- Vandal-Resistant Security Options: Available in the ML2000VR (Vandal Resistant) Series featuring stainless steel escutcheons with tapered edges and Torx® pin tamper-resistant screws for added protection against abuse and intrusion.
- Thru-Bolted Trim Design: Thru-bolted trim ensures proper alignment and increased security for long-term, reliable operation in demanding environments.
- 10-Year Limited Warranty: Backed by a 10-Year Limited Warranty, reflecting Corbin Russwin's confidence in the ML2000 Series' durability and performance.
Technical Specifications
- Subcategory: Mortise Locks
- Product Group: Mechanical Locks
- 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
- Product Attribute: Mortise Locks
- Electronic: No
- Collection: ML2000 Series
- Product Category: Mechanical Locks
- Product Substrate: Brass or Bronze
- Department: Door Hardware
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 backed by heavy-gauge steel construction, a 1" stainless steel deadbolt, and a patented Quick Reversible latchbolt — UL cycle tested to an exceptional 14.5 Million Cycles (Verification ID: V875753). Engineered for the most demanding commercial and institutional applications, the ML2055 provides life safety and security in a single door prep, offering a versatile, code-compliant solution trusted in offices, schools, hospitals, and high-traffic facilities worldwide.
Manufacturer Resources
ML2000 Series Catalog
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
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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
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selection,
installation tips, and troubleshooting. Contact Us
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