Corbin Russwin ML2051 Grade 1 ...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$676.75
$305.24
Corbin Russwin ML2051 Grade 1 Entrance/Office Mortise Lockbody Only - front three-quarter view, satin finish

Corbin Russwin ML2051 Grade 1 Entrance or Office - Mortise Lockbody Only

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Model: ML2051-LL-626
From the ML2000_Series Collection
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$676.75
$305.24
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Corbin Russwin ML2051-LL Grade 1 Mortise Lockbody Only - Entrance/Office Function, Field Reversible

Commercial-Grade Mortise Lock Solution for Entrance and Office Applications

The Corbin Russwin ML2051-LL is a Grade 1 mortise lockbody from the ML2000 Series, engineered for demanding entrance and office applications in commercial, institutional, industrial, and government environments. Constructed of heavy-gauge steel, this lockbody features ANSI function F04 operation, a patented Quick Reversible latchbolt, and a 1" stainless steel deadbolt, all within a standard 1-3/4" (44mm) door thickness preparation. The field-reversible handing and multi-function lockbody design make it a versatile solution for a wide range of door configurations, and the included ANSI straight lip strike measures 4-7/8" (124mm) x 1-1/4" (32mm) x 1-1/8" (29mm) lip to center.

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 ML2051 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
  • ANSI Function: F04 - Entrance/Office
  • 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 Hospitality Properties
  • Industrial and Government Facilities
  • Multi-Tenant Residential and Mixed-Use Properties
  • Institutional and High-Traffic Public Buildings

Tamper-Resistant Design

The ML2000VR (Vandal Resistant) Series option features vandal-resistant stainless steel escutcheons with tapered edges and Torx® pin tamper-resistant screws, providing an additional layer of security against abuse and unauthorized access. When paired with Corbin Russwin patented high-security Pyramid or Access 3® cylinders, any door can become a formidable barrier to intruders.

Why Choose Corbin Russwin Quality?

Corbin Russwin ML2000 Series mortise locks deliver professional-grade reliability through heavy-gauge steel construction and a 1" stainless steel deadbolt, with UL cycle testing verified at an exceptional 14.5 Million Cycles (Verification ID: V875753). Backed by a 10 Year Limited warranty and a patented Quick Reversible latchbolt design, the ML2051-LL is engineered for the most demanding commercial applications where dependable, long-term performance is essential.

Product Specs

Subcategory:
Mortise Locks
Product Group:
Mechanical Locks
Series:
ML2000 Series
Grade:
Grade 1
Standard Latch:
3/4" Latchbolt
Standard Strike:
ANSI straight lip standard, 4-7/8" x 1-1/4" x 1-1/8"
Warranty:
10 Year Limited
Keyed Function:
Non-Keyed
ANSI/BHMA:
F04
Product Subgroup:
Mortise Lock Bodies
Product Type:
Mortise Lockbody Only
Keyed:
No
Commercial/Residential:
Commercial
Function Description:
Mortise Lockbody Only
Lock Type:
Mortise
Lock Function:
Entrance/Office
Segment:
Door Hardware
Product Attribute:
Mortise Locks
Electronic:
No
Tags:
ml 2051, ml2051 corbin russwin, corbin russwin ml2051 ll626
Product Model:
ML2051
Collection:
ML2000_Series
Product Function:
Entrance/Office
Door Hand Direction:
Field Reversible
Door Thickness Range:
1-3/4" standard; optional thicknesses available
Product Category:
Mechanical Locks
Product Substrate:
Brass or Bronze
Department:
Door Hardware

Corbin Russwin ML2051-LL-626 – Frequently Asked Questions

1) Does the Corbin Russwin ML2051 come with a lever and a cylinder, or do I order those separately?
Lockbody only. The ML2051 ships as the mortise case with its ANSI straight lip strike, 4-7/8 x 1-1/4 inches with 1-1/8 inches lip to center. Levers, roses or escutcheons, and the cylinder are separate line items, so budget trim and a cylinder for every opening. The case is supplied non-keyed; the Corbin Russwin standard cylinder for it is brass, 6-pin L4 keyway, 0-bitted, and the lock also accepts most other manufacturers' cylinders.
2) Will the Corbin Russwin ML2051 mortise lock fit a standard 1-3/4 inch commercial door?
Yes. 1-3/4 inches (44mm) is the standard prep for the ML2051, with optional thicknesses available for heavier doors. The lock works to a 2-3/4 inch (70mm) backset, and the heavy gauge steel case measures 5-7/8 x 4 x 15/16 inches, so the mortise pocket in the door edge has to accept that. The armored front is 8 x 1-1/4 inches. On the face of the door, center to center is 3-5/8 inches from lever to cylinder and 2-7/16 inches from lever to thumbturn, which is what your trim has to match.
3) Do I have to specify left hand or right hand when ordering the ML2051 mortise lockbody?
No, handing is set in the field. The ML2051 uses a patented Quick Reversible latchbolt, so the hand is changed without disassembling the lock case. One lockbody covers both hands, which is why it works as a stocked spare for a building with mixed handing instead of carrying a left and a right part number.
4) Can the Corbin Russwin ML2051 be used on a 3-hour fire rated door?
Fire rated openings are covered. The ML2051 is UL and cUL listed to UL10C positive pressure for 3-hour fire doors, up to 4 x 10 feet as a single door and 8 x 10 feet as a pair. It also carries a California State Fire Marshal listing, which is what a spec in California will ask for.
5) What does the F04 entrance/office function on the ML2051 actually do at the door?
F04 is the entrance/office function: the outside lever is locked and unlocked by key from outside or by a turn piece inside, and the inside lever always retracts the latch so people can get out. The ML2051 case also carries its own one-piece stainless deadbolt with a 1 inch throw, thrown by key outside or thumbturn inside, so the opening gets a deadbolt and a latch from a single case instead of a separate deadbolt above the lock. Trim spacing is 2-7/16 inches center to center from lever to thumbturn.
6) Will the ML2051 latch into the strike that is already in my frame?
That depends on the prep in the frame. The ML2051 throws a 3/4 inch (19mm) two-piece anti-friction latchbolt plus a 9/16 inch deadlocking auxiliary latch, and it comes with an ANSI straight lip strike at 4-7/8 x 1-1/4 inches, 1-1/8 inches lip to center. If the frame already has an ANSI 4-7/8 inch strike cutout from another mortise lock, the supplied strike drops straight in and the deadbolt pocket is already there. A frame prepped for a cylindrical lockset, with a T-strike or a small box, will not take it without new frame work.
7) Can I key the ML2051 into the master key system I already run in my building?
Yes, in both directions. The lockbody can be used with new or existing Corbin Russwin key systems, and it accepts most other manufacturers' cylinders, so a property standardized on a different keyway does not have to break its system to use it. The Corbin Russwin standard is a brass 6-pin L4 keyway cylinder supplied 0-bitted for your locksmith to pin. The lockbody itself is supplied non-keyed, so the cylinder is a separate order.
8) What is a cross-brand Grade 1 mortise lockbody alternative to the Corbin Russwin ML2051?
The Accentra 8800FL Series mortise lock body is the closest cross-brand counterpart. Both are ANSI/BHMA Grade 1 mortise lock bodies supplied as a lockbody only, and both are field reversible, so the hand of the opening does not decide which one you order. The Corbin Russwin ML2051 is set up for ANSI function F04 entrance/office operation, on a 1-3/4 inch door prep with a 2-3/4 inch backset and a heavy-gauge steel case measuring 5-7/8 inches by 4 inches by 15/16 inch. When you cross to the Accentra 8800FL body, specify the 8800FL function that gives you the entrance/office operation the opening calls for, and confirm the existing mortise pocket depth and backset match the body you order.
9) Should I use a mortise lock like the ML2051 or a cylindrical lever lock on my office doors?
A mortise lock needs a pocket routed into the door edge, 5-7/8 x 4 x 15/16 inches for the ML2051 case, a 2-3/4 inch backset, and an ANSI 4-7/8 inch strike prep in the frame. If your doors are already bored for a cylindrical lock with a 2-1/8 inch cross bore, converting to mortise means new door prep on every leaf. What the mortise case buys you is a 1 inch throw stainless deadbolt in the same body as the latch, 12 functions available from one lockbody, and ANSI/BHMA operational and security Grade 1 at 14.5 million cycles. New commercial entrance and office doors are normally specified mortise; existing cylindrical openings are usually better served by staying cylindrical.
10) Is the ML2051 heavy duty enough for a main entrance that gets hammered all day?
It is built for exactly that. ANSI/BHMA A156.13 Series 1000, operational and security Grade 1, which is the top of the three grades and the level normally written into commercial, school and hospital specs. The case is heavy gauge steel, and UL cycle testing on it is verified at 14.5 million cycles, verification ID V875753. The latchbolt is a two-piece design with an anti-friction insert, so a heavy door under a strong closer needs less force to latch, which is where cheaper locks start missing the strike.
11) Can the ML2051 mortise lock be electrified for card access or electric latch retraction?
No. The ML2051 is a mechanical lockbody with no electric option; access on it is by key and by the inside turn. If the opening needs Motorized Electric Latch Retraction, that is offered on the ML20900 series, so specify that series rather than trying to electrify an ML2051.
12) How many lock functions can I get out of one ML2051 lockbody?
Twelve. The ML2051 is a multi-function case, configurable to 12 functions from the one lockbody, which is the reason large properties stock it: one part number on the shelf covers a range of openings instead of a separate case per function. Handing reverses in the field on the same body, so a single stocked lock covers both hands as well. The base configuration as supplied is ANSI F04, entrance/office.
13) What else is there if I need a Grade 1 mortise lock body with field reversible handing?
The cross-brand alternative in the same class is the Accentra 8800FL Series mortise lock body, also Grade 1 and also field reversible in handing. Pick the Corbin Russwin ML2051 when the building runs a Corbin Russwin key system or the trim has to match other ML2000 series openings, and when you want the F04 entrance/office case with its 1 inch throw stainless deadbolt and ANSI 4-7/8 inch straight lip strike. Both are lock bodies only, so trim and cylinders are a separate order either way.
14) Which Grade 1 mortise lock bodies can be stocked for both left hand and right hand openings?
Both the Corbin Russwin ML2051 and the Accentra 8800FL Series mortise lock body are field reversible, so one shelf part covers either hand. On the ML2051 the reversing is done with a patented Quick Reversible latchbolt that re-hands without disassembling the lock case, which is what makes it practical to carry a single Grade 1 entrance/office body across a mixed-hand building instead of splitting the stock two ways. For a maintenance shop replacing failed bodies across many openings, either one lets you pull a body off the shelf without checking the hand of the door first.
15) If I replace an Accentra 8800FL mortise lock body with a Corbin Russwin ML2051, what happens to my keying?
The ML2051 body is supplied non-keyed, with the mortise cylinder specified separately, and it can be used with new or existing Corbin Russwin key systems as well as most other manufacturers' cylinders. That means a building already keyed on another system can often carry its cylinders forward onto ML2051 bodies rather than rekeying the whole opening. The Corbin Russwin standard for the series is a brass 6-pin L4 keyway cylinder, 0-bitted, if you are starting a new key system instead. The Accentra 8800FL Series is likewise a lock body, so the cylinder is a separate decision on that side too - confirm the cylinder cam and length you are reusing suit the 1-3/4 inch door prep before you order.
16) What trim options work with the ML2051 for healthcare, behavioral health or high-abuse openings?
The ML2000 series trim range runs from Museo and Vineyard designs to Behavioral Health trim, BHSS and BLSS, for rooms where ligature risk drives the hardware choice. For abuse-prone public areas there is the ML2000VR vandal resistant option, with stainless steel escutcheons, tapered edges and Torx pin tamper resistant screws. Status indicators showing locked or unlocked are available on sectional and escutcheon trim. All ML2000 trim is thru-bolted for alignment and added security, and it orders separately from the lockbody.
17) Does the ML2051 satisfy ADA and coastal windstorm requirements on a spec job?
The ML2051 is listed to ADA A117.1, is windstorm and hurricane certified, and holds a California State Fire Marshal listing, on top of ANSI/BHMA A156.13 Grade 1 and UL10C positive pressure. One thing to watch on the ADA side: the lockbody is only half of it. Specify lever trim rather than knob trim on an accessible route, since the operating device is what has to work without tight grasping or twisting of the wrist.
18) Can I get the ML2051 in a finish that matches the hardware already on my other doors?
Fourteen finishes are offered: 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 steel, 630 satin stainless steel, 722 black oxidized bronze oil-rubbed, and BSP black suede powder coat. If you are matching existing commercial openings, 626 and 630 are the two BHMA codes you will run into most often. Base material is brass or bronze.
19) Does swapping between the Corbin Russwin ML2051 and the Accentra 8800FL body give me the levers and escutcheons too?
No. Both the ML2051 and the Accentra 8800FL Series are mortise lock bodies, which means the case, latchbolt and deadbolt only - the lever or knob trim, the escutcheon or sectional rose, and the cylinder are specified separately on either one. A cross-brand body swap therefore does not carry trim across: trim is matched to the body it was designed for, so plan on ordering ML2000 Series trim with an ML2051 body. The ML2051 side has a wide range of trim to draw from, including Museo, Vineyard, and Behavioral Health BHSS and BLSS designs, along with status indicator options on sectional and escutcheon trim. Finish is selected on the body as well, across 605 bright brass through 630 satin stainless steel and BSP black suede powder coat, so match the finish code to the trim you are ordering.
How fast can I get the Corbin Russwin ML2051-LL-626 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-LL-626 come with a warranty?
Absolutely. The Corbin Russwin ML2051-LL-626 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-LL-626?
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-LL-626 from ZenSupply?
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Product Reviews

  • 5
    Solid Security, Some Compatibility Concerns

    Posted by Marc on Dec 26th 2023

    This Corbin Russwin ML2051 lockbody packs some serious security punch - sturdy build and smooth operation. But heads up, compatibility might be an issue for some door types, so double-check before purchasing.

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