Corbin Russwin ML2051 Grade 1 ...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$1,074.65
$455.93
Corbin Russwin ML2051 Mortise Office Lockset Lever Trim Only

Corbin Russwin ML2051 Grade 1 Mortise Office Lockset Lever Trim Only

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Model: ML2051-NSA-626-M31
$1,074.65
$455.93
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$1,074.65
$455.93
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Corbin Russwin ML2051-M31 Mortise Office Lock Trim Grade 1 Field-Reversible Lever Trim for ML2000 Series

Commercial-Grade Mortise Lock Lever Trim for High-Traffic Applications

The Corbin Russwin ML2051-M31 is a professional-grade mortise lock lever trim designed as a replacement part and accessory for the ML2000 Series mortise lockset platform. Engineered for demanding commercial, institutional, industrial, and government environments, this lever trim is compatible with the ML2000 Series Grade 1 mortise lockbody — a heavy-gauge steel lock system tested to over 14.5 million cycles (UL Cycle Verification ID: V875753). The ML2051-M31 features field-reversible handing, allowing installers to adapt the trim to virtually any door configuration without disassembling the lock case, thanks to Corbin Russwin's patented Quick Reversible latchbolt design. Backed by a 10-year limited warranty, this trim delivers the reliability and versatility required for offices, schools, hospitals, hotels, and other high-use facilities.

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
  • Hotel and Hospitality Properties
  • Industrial and Government Facilities
  • Multi-Tenant Residential and Mixed-Use Properties
  • Institutional and High-Traffic Public Buildings

Tamper-Resistant Design

The ML2000 Series supports vandal-resistant trim configurations featuring stainless steel escutcheons with tapered edges and Torx® pin tamper-resistant screws, providing a formidable barrier against abuse and unauthorized manipulation in high-risk environments.

Why Choose Corbin Russwin Quality?

Corbin Russwin ML2000 Series mortise lock products deliver professional-grade reliability with heavy-gauge steel construction rated for over 14.5 million cycles per UL cycle testing (Verification ID: V875753). The ML2051-M31 lever trim is backed by a 10-year limited warranty and features field-reversible handing and thru-bolted construction for lasting security and ease of installation. Engineered for demanding commercial applications where dependable performance and long-term durability are essential.

Product Specs

Product Group:
Parts and Accessories
Series:
ML2000 Series
Grade:
Grade 1
Warranty:
10 Year Limited
Product Subgroup:
Parts and Accessories
Product Type:
Lock Trim
Commercial/Residential:
Commercial
Lock Type:
Mortise
Subcategory:
Parts and Accessories
Parts and Accessories Type:
Replacement Parts
Product Attribute:
Parts and Accessories
Product Model:
ML2051
Product Function:
Entrance/Office
Door Hand Direction:
Field Reversible
Product Category:
Mechanical Locks
Department:
Door Hardware

Corbin Russwin ML2051-NSA-626-M31 – Frequently Asked Questions

1) Is the Corbin Russwin ML2051-M31 a complete mortise lock or just the lever trim?
Lever trim only. The ML2051-M31 is the trim side of an ML2000 Series office/entrance mortise lockset, supplied as a replacement part, so it mounts to an ML2000 Series Grade 1 mortise lockbody that is already in the door (or one you order separately). If your lockcase is worn out or you have no mortise pocket prepped, trim alone won't get the door working.
2) Do I have to order the ML2051 lever trim handed, or can I flip it in the field?
Order it and re-hand it on site. The ML2000 mortise platform uses Corbin Russwin's Quick Reversible latchbolt, so handing is changed without pulling the lock case apart. That matters on a retrofit where you find the door swings the other way once you're standing in front of it. Note the Dirke lever is the exception in the trim range: it comes as a distinct left hand and right hand lever, so that one you specify by hand.
3) What door thickness and backset does the Corbin Russwin ML2000 mortise lockset work with?
Standard is a 1-3/4 inch (44mm) door on a 2-3/4 inch (70mm) backset, which is the normal commercial mortise prep. Optional thicknesses are available for thicker doors. If your existing mortise pocket was cut for a 2-3/4 inch backset (nearly all commercial mortise prep is), the ML2000 case drops into it, and the ML2051 lever trim lands where the old trim did.
4) Will the ML2000 mortise lock latch into the strike that's already in my frame?
The latchbolt throws 3/4 inch (19mm) and there's a deadlocking auxiliary latch with a 9/16 inch (14mm) effective throw; the deadbolt throws a full 1 inch. The supplied strike is an ANSI straight lip, 4-7/8 x 1-1/4 inches with 1-1/8 inch lip to center. If your frame already has an ANSI 4-7/8 inch strike cutout, you're on the same prep. A T-strike or a smaller residential strike box won't accept it without reworking the frame.
5) Can I use my existing keys and cylinders with a Corbin Russwin ML2000 mortise lock?
Yes on both counts. The ML2000 works with new or existing Corbin Russwin key systems, and it accepts most other manufacturers' cylinders, so a building already keyed to another brand can usually stay on its own keyway. Supplied as standard it's a brass 6-pin L4 keyway cylinder, 0-bitted, which a locksmith pins to your system. Cylinder spacing is 3-5/8 inches (92mm) center to center from the lever, and 2-7/16 inches (62mm) lever to thumbturn.
6) What do I have to specify when ordering Corbin Russwin ML2051 lever trim?
Three things: lever design, rose or escutcheon, and finish. Lever choices are Armstrong (AS), Citation (CS), Dirke (DS, ordered left or right hand), Essex (ES), Lustra cast (LS), Lustra wrought (LW), Newport (NS), Princeton (PS) and Regis (RS). Trim plate is A rose at 2-1/4 inch diameter, F rose at 2-7/8 inch diameter, or M and N escutcheons. The M31 designation on this part is the M escutcheon with the Newport lever. Finish runs 605 through 630 plus 613E, 722 black oxidized bronze oil-rubbed and BSP black suede powder coat.
7) Is the Corbin Russwin ML2000 mortise lock approved for a fire-rated door?
UL/cUL listed and UL10C positive pressure, rated for 3-hour fire doors up to 4 x 10 feet single or 8 x 10 feet pair. It also carries ANSI/BHMA A156.13 Series 1000 Grade 1 for both operational and security grade, ADA A117.1, California State Fire Marshal, and windstorm/hurricane certification. For a spec-driven institutional job that covers the usual submittal boxes on a corridor or stair door.
8) What does the ML2051 office function actually do at the door?
Entrance/office function. The outside lever is locked or unlocked by key, the inside lever always retracts the latch for free egress, and once unlocked the door stays in passage until someone keys it back. That's the function you want on a tenant suite door, a classroom corridor door on an office schedule, or a departmental office that gets unlocked in the morning and locked at night. If you need the outside lever locked at all times with key-only entry, that's a different function number in the ML2000 range, not the ML2051.
9) Should I pick a rose or an escutcheon for mortise lever trim?
It comes down to what the old trim covered and whether you want a thumbturn or indicator on the outside plate. A rose is a small round plate, 2-1/4 inches on the A rose or 2-7/8 inches on the F rose, and it leaves the cylinder standing separately on the door face. An escutcheon (M or N) is a long plate that takes in the lever and the cylinder or thumbturn together, which is the choice when you're covering old prep marks or want the status indicator option, since indicators are offered on sectional and escutcheon trim.
10) Will Corbin Russwin ML2051 trim hold up on a high-traffic door like a school or hospital corridor?
The ML2000 platform is UL cycle verified to over 14.5 million cycles (Verification ID V875753) on a heavy-gauge steel lockcase, and the trim is thru-bolted rather than screwed to the face, which keeps the lever aligned under repeated pull. For genuinely abusive openings there are vandal-resistant configurations with stainless steel tapered-edge escutcheons and Torx pin tamper-resistant screws. That's the version to spec for behavioral health, detention-adjacent, or public restroom corridors rather than the standard rose trim.
11) I need to standardize a building on one mortise lock but the doors have different functions. Do I have to stock a different lockbody for each?
No. Twelve functions are configurable from a single ML2054 lockbody, so a facility can carry one case on the shelf and change what the door does with the trim and internal setup instead of ordering office, classroom and storeroom cases separately. For an MRO stockroom that cuts the parts you have to keep on hand, and it's why the ML2000 turns up in standardization specs across schools and hospitals.
12) How much of the door edge does the Corbin Russwin ML2000 mortise case take up?
The lockcase is 5-7/8 x 4 x 15/16 inches (149 x 102 x 24mm) and the armored front is 8 x 1-1/4 inches. Those numbers decide whether it goes into a given door: a narrow stile aluminum door with a shallow pocket won't take a 4 inch deep case, and the 8 inch front needs that much continuous edge prep. On a standard hollow metal or solid core wood door cut for ANSI mortise prep, it drops in.
13) Can I get Corbin Russwin ML2000 mortise locks with electric latch retraction for an access control system?
Motorized Electric Latch Retraction (MELR) is offered on the ML20900 series, which is the electrified branch of the ML2000 platform rather than the mechanical ML2051. If you're tying doors into card access and want the latch pulled back on a credential, that's the series to specify. The mechanical ML2051 trim covered here is a key-operated office function with no electrical option.
14) Does the anti-friction latchbolt on the ML2000 make a difference on a door with a closer?
It does on doors that fight you. The latchbolt is a two-piece mechanical design with an anti-friction insert, so it takes less force to drive the bolt over the strike lip and latch the door. On a fire door with a strong closer, or a stack-pressure stair door that keeps bouncing off the strike, that's the detail that stops callbacks about doors not latching. Bolt face is 5/8 x 1 inch with the 3/4 inch throw.
15) What finish should I order to match the other Corbin Russwin lever trim in my building?
Match by BHMA number, not by name. The ML2051 trim runs 605 bright brass, 606 satin brass, 611 bright bronze, 612 satin bronze, 613 satin bronze oil-rubbed, 613E dark oxidized satin bronze equivalent, 618 bright nickel, 619 satin nickel, 625 bright chrome, 626 satin chrome, 629 bright stainless, 630 satin stainless, 722 black oxidized bronze oil-rubbed, and BSP black suede powder coat. Most commercial buildings are on 626 or 630. Pull an existing lever off a door and read the number stamped on it before you order the rest.
How fast can I get the Corbin Russwin ML2051-NSA-626-M31 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Corbin Russwin ML2051-NSA-626-M31 come with a warranty?
Absolutely. The Corbin Russwin ML2051-NSA-626-M31 is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Corbin Russwin ML2051-NSA-626-M31?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
Why buy the Corbin Russwin ML2051-NSA-626-M31 from ZenSupply?
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