Corbin Russwin ML2052 Grade 1 Mortise Classroom Intruder Door Lever Lockset Body Only

Corbin Russwin ML2052 Classroom Intruder Mortise Lockset Body Only Grade 1, Field Reversible, 1-3/4" Door

ANSI F32 Classroom Intruder Function Commercial-Grade Mortise Lock Body for High-Traffic Security Applications

The Corbin Russwin ML2052 is a Grade 1 mortise lockset body engineered for classroom intruder (ANSI function F32) applications in demanding commercial, institutional, and government environments. Constructed of heavy-gauge steel with a 1" stainless steel deadbolt and patented Quick Reversible latchbolt, this lockset body fits standard 1-3/4" (44mm) doors and is field reversible for flexible installation. The ML2052 delivers latchbolt operation by grip from either side unless the outside grip is locked by key from either side, with the inside grip always remaining free — providing critical life-safety egress at all times. 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 auxiliary latch deadlocks the latchbolt for added security.

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

• K-12 Schools and Educational Facilities (Classroom Intruder Lockdown)
• Higher Education Campuses
• Healthcare Institutions and Hospitals
• Commercial Office Buildings
• Government and Municipal Buildings
• Hotels and Hospitality Properties
• Industrial and Institutional Facilities

Why Choose Corbin Russwin Quality?

Corbin Russwin ML2000 Series mortise lock products deliver professional-grade reliability through heavy-gauge steel construction with a 1" stainless steel deadbolt, rated for an extraordinary 14.5 Million Cycles in UL testing (Verification ID: V875753) — well above and beyond standard requirements. The ML2052 is backed by a 10 Year Limited warranty and is Grade 1 certified, making it the trusted choice for offices, schools, hospitals, hotels, and other high-use commercial applications where dependable security and life-safety performance are essential.