Corbin Russwin ML2051 Grade 1 Mortise Entrance or Office Lockset

Corbin Russwin ML2051-KEYED Grade 1 Mortise Entrance/Office Lock with Field Reversible Latchbolt

Commercial-Grade Mortise Security for High-Traffic Entrance and Office Applications

The Corbin Russwin ML2051-KEYED is a Grade 1 mortise entrance and office lockset from the ML2000 Series, engineered for demanding commercial, institutional, industrial, and government environments. Conforming to ANSI function F04, this lock features a latchbolt operated by key when the outside grip is locked by toggle action stop, with the inside grip always free for safe egress. Constructed of heavy-gauge steel with a 3/4" latchbolt and a 1" stainless steel deadbolt, the ML2051-KEYED is designed for 1-3/4" (44mm) standard door thickness and delivers an auxiliary latch that deadlocks the latchbolt for enhanced security. The ML2000 Series has been UL cycle tested above and beyond requirements, completing 14.5 Million Cycles (Verification ID: V875753), making it one of the most rigorously validated mortise locks available for high-use applications.

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

• Commercial Office Buildings
• Educational Facilities and Schools
• Healthcare Institutions and Hospitals
• Hotels and Hospitality Properties
• Industrial and Government Facilities
• Multi-Tenant Residential and Institutional Properties
• High-Traffic Entrance and Secured Office Environments

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 for applications requiring heightened security against abuse and unauthorized access attempts.

Why Choose Corbin Russwin Quality?

Corbin Russwin ML2000 Series mortise locks are built to Grade 1 commercial standards with heavy-gauge steel construction and a 1" stainless steel deadbolt, UL cycle tested to an exceptional 14.5 Million Cycles (Verification ID: V875753) for proven long-term reliability. Backed by a 10 Year Limited warranty and featuring the patented Quick Reversible latchbolt, these locks deliver life safety and security in a single door prep. Engineered for offices, schools, hospitals, hotels, and other demanding high-use commercial applications where dependable performance is essential.