Corbin Russwin ML20907 Grade 1 Fail Secure Electrified Mortise Lock, Outside Grip Locked when Energized, No Cylinder Override, Lever x Lever Body Only

Corbin Russwin ML20907-LL-SEC Fail Secure Electrified Mortise Lock Body with Outside Grip Locked when Energized

Grade 1 Electrified Mortise Lock Body for High-Traffic Commercial Applications

The Corbin Russwin ML20907-LL-SEC is a Fail Secure electrified mortise lock body from the ML2000 Series, engineered for demanding commercial, institutional, industrial, and government environments. When energized, the outside grip is locked, while the inside grip remains always free for safe egress. The lock features a 3/4" latchbolt, an auxiliary latch that deadlocks the latchbolt, and is constructed of heavy-gauge steel with a 1" stainless steel deadbolt. Designed for 1-3/4" (44mm) standard door thickness with field-reversible handing, this Grade 1 mortise lockbody delivers life safety and security in a single door preparation. The ML2000 Series has been UL cycle tested above and beyond requirements, completing 14.5 Million Cycles (Verification ID: V875753).

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 Multi-Tenant Residential Properties
• Industrial and Warehouse Facilities
• Government and Municipal Buildings
• Institutional and High-Security Environments

Tamper-Resistant Design

The ML2000VR (Vandal Resistant) Series variant features vandal-resistant stainless steel escutcheons with tapered edges and Torx® pin tamper-resistant screws. When paired with Corbin Russwin patented high-security Pyramid or Access 3® cylinders, any door can become a formidable barrier to intruders, making it an ideal choice for high-abuse or high-security applications.

Why Choose Corbin Russwin Quality?

Corbin Russwin ML2000 Series mortise lock products deliver professional-grade reliability with heavy-gauge steel construction and a 1" stainless steel deadbolt, UL cycle tested to an exceptional 14.5 Million Cycles (Verification ID: V875753) — well above and beyond standard requirements. Backed by a 10 Year Limited warranty and a Grade 1 rating, the ML20907-LL-SEC is engineered for the most demanding commercial applications where dependable, long-term performance is essential.