Corbin Russwin ML2056 Grade 1 Mortise Classroom Lever Lockset

Corbin Russwin ML2056-KEYED Classroom Holdback Mortise Lever Lockset with Field Reversible Latchbolt

Grade 1 Commercial Mortise Lock for High-Traffic Classroom and Institutional Applications

The Corbin Russwin ML2056-KEYED is a Grade 1 mortise lockset from the ML2000 Series, engineered for demanding classroom holdback applications in commercial, institutional, industrial, and government environments. Featuring ANSI function F06, this lock allows the latchbolt to operate freely by grip from either side unless the outside grip is locked or unlocked by key, and the latchbolt can be held in a retracted position by key or released by key. Designed for 1-3/4" (44mm) standard door thickness, the lockset ships with an ANSI straight lip strike measuring 4-7/8" (124mm) x 1-1/4" (32mm) x 1-1/8" (29mm) lip to center. Constructed of heavy-gauge steel with a 1" stainless steel deadbolt, the ML2056 delivers life safety and security in a single door prep.

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 Hospitals
• Government and Municipal Buildings
• Hotels and Hospitality Properties
• 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 and a 1" stainless steel deadbolt, with UL Cycle testing completed at 14.5 Million Cycles (Verification ID: V875753) — well above and beyond standard requirements. The ML2056-KEYED is covered by a 10 Year Limited warranty, providing long-term confidence for facility managers and installers. Engineered for the most demanding commercial, institutional, and government applications where dependable performance and life safety are essential.