Corbin Russwin ML2057 Grade 1 LL Storeroom Mortise Lockbody Only — LFIC Prep

Corbin Russwin ML2057-LL Storeroom Mortise Lockbody — LFIC Prep, Grade 1, Field Reversible

Commercial-Grade Storeroom Mortise Lock with Patented Quick Reversible Latchbolt

The Corbin Russwin ML2057-LL is a Grade 1 storeroom mortise lockbody from the ML2000 Series, engineered for demanding commercial, institutional, industrial, and government applications. Designed to ANSI function F07, this lockbody features latchbolt operation by grip inside or by key outside, with the outside grip always rigid and the inside grip always free — providing reliable storeroom and closet security in a single door prep. Built for 1-3/4" (44mm) standard door thickness from heavy-gauge steel, the ML2057-LL includes a patented Quick Reversible latchbolt and a 1" stainless steel deadbolt, and is backed by a 10-year limited warranty. The auxiliary latch deadlocks the latchbolt for added security, and the field-reversible handing eliminates the need for disassembly during installation.

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 — Storeroom and Supply Closet Security
• Educational Facilities — Classroom and Storage Area Access Control
• Healthcare Institutions — Medication Storage and Restricted Area Lockdown
• Hotels and Hospitality Properties — Housekeeping and Service Area Security
• Industrial and Warehouse Facilities — Tool Room and Parts Storage
• Government and Municipal Buildings — Secure Storage and Records Rooms
• Multi-Tenant Residential and Mixed-Use Properties — Common Area Storage Security

Why Choose Corbin Russwin Quality?

Corbin Russwin ML2000 Series mortise locks deliver professional-grade reliability with heavy-gauge steel construction and a 1" stainless steel deadbolt, rated for over 14.5 million cycles in UL testing (Verification ID: V875753) — performance that goes above and beyond standard requirements. Backed by a 10 Year Limited warranty and featuring the patented Quick Reversible latchbolt, the ML2057-LL is engineered for the most demanding commercial, institutional, and government applications where dependable, long-term security performance is essential.