Corbin Russwin ML2055 Grade 1 ...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$676.75
$309.50
Corbin Russwin Corbin Russwin ML2055 Classroom - Mortise Lockbody Only COR-ML2055-LL

Corbin Russwin ML2055 Grade 1 LL Classroom Mortise Body Only

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Model: ML2055-LL-626
From the ML2000_Series Collection
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$676.75
$309.50
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Corbin Russwin ML2055-LL Classroom Mortise Lockbody, Grade 1, ANSI F05, Field Reversible

Heavy-Duty Commercial Classroom Mortise Lock with Patented Quick Reversible Latchbolt

The Corbin Russwin ML2055-LL is a Grade 1 classroom mortise lockbody from the ML2000 Series, engineered to meet the rigorous demands of high-traffic commercial, institutional, industrial, and government applications. Conforming to ANSI function F05, this lockbody allows the latchbolt to be operated by grip from either side unless the outside grip is locked by key, at which point the latchbolt is operated by key only — while the inside grip always remains free. Constructed of heavy-gauge steel with a 1" stainless steel deadbolt and a patented Quick Reversible latchbolt, the ML2055-LL is designed for 1-3/4" (44mm) standard door thickness and features field-reversible handing for flexible installation. The ML2000 Series has been UL cycle tested above and beyond standard requirements, completing over 14.5 Million Cycles (Verification ID: V875753), making it an ideal choice for offices, schools, hospitals, hotels, and other demanding high-use environments.

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

  • Educational Facilities and Classroom Environments
  • Commercial Office Buildings
  • Healthcare Institutions and Hospitals
  • Hotels and Hospitality Properties
  • Government and Municipal Buildings
  • Industrial and Institutional Facilities
  • Multi-Tenant Residential and Mixed-Use Properties

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 forced entry in demanding environments.

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, UL cycle tested to over 14.5 Million Cycles (Verification ID: V875753) — far exceeding standard requirements. Backed by a 10 Year Limited warranty and featuring the patented Quick Reversible latchbolt, the ML2055-LL is engineered for demanding commercial applications where dependable performance, life safety, and long-term security are 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:
Single Cylinder
ANSI/BHMA:
F05
Product Subgroup:
Mortise Lock Bodies
Product Type:
Mortise Lockbody Only
Keyed:
Yes
Commercial/Residential:
Commercial
Function Description:
Mortise Lockbody Only
Lock Type:
Mortise
Lock Function:
Classroom
Segment:
Door Hardware
Product Attribute:
Mortise Locks
Electronic:
No
Tags:
ML2055LL630, ML2055LL626
Product Model:
ML2055
Collection:
ML2000_Series
Product Function:
Classroom
Door Hand Direction:
Field Reversible
Door Thickness Range:
1-3/4"
Product Category:
Mechanical Locks
Product Substrate:
Brass or Bronze
Department:
Door Hardware

Corbin Russwin ML2055-LL-626 – Frequently Asked Questions

1) Will the Corbin Russwin ML2055 classroom mortise lock fit a 1-3/4 inch door?
Yes, 1-3/4 inches (44mm) is the standard door thickness for the ML2055-LL, and it's the thickness the lockbody ships prepped for. Optional thicknesses are available for thicker doors. The backset is 2-3/4 inches, which is the standard commercial mortise backset, so an existing ANSI mortise pocket cut for a 2-3/4 inch backset takes it directly.
2) What does the ML2055 classroom function actually do at the door?
Classroom function, ANSI F05. The latchbolt works from either side by grip until a key locks the outside grip from outside, and from then on only the key retracts the latch on the outside. The inside grip is always free, so nobody gets locked in. There is no inside button or turn, which is the point of the function: a teacher cannot leave the room locked or unlocked by accident, only a keyholder changes the state. If you want a lockdown that can be secured from inside the room without opening the door, F05 is the wrong function for you.
3) Is the ML2055 lockbody handed, or can I re-hand it on the job?
Field reversible. The ML2000 Series uses a patented Quick Reversible latchbolt, so you flip the hand without disassembling the lock case, no parts to order and no case to open on the ladder. That makes it practical to stock one lockbody for both left and right hand openings across a building.
4) I'm ordering the ML2055-LL lockbody only, what else do I need to complete the lock?
The ML2055-LL is the lock case by itself. To finish the opening you still need trim (lever or knob with rose or escutcheon), a cylinder, and a strike. Corbin Russwin's standard cylinder for the series is brass, 6-pin, L4 keyway, 0-bitted; the standard strike is a wrought brass, bronze, or stainless ANSI straight lip strike, 4-7/8 x 1-1/4 with 1-1/8 inch lip to center. Armored front is 8 x 1-1/4 inches. Order all of it in the same finish as the lockbody so the opening matches.
5) Will the ML2055 latch into the strike that's already in my frame?
The latchbolt throws 3/4 inch (19mm) and it's a two-piece anti-friction design, with a 9/16 inch effective throw deadlocking auxiliary latch alongside it. The deadbolt throws a full 1 inch. If the frame already carries an ANSI straight lip strike with a 4-7/8 x 1-1/4 inch face, the geometry lines up. What to check on an existing frame is the deadbolt cutout, since a 1 inch stainless deadbolt needs a deeper pocket than a latch-only strike provides.
6) Will the ML2055 fit in my existing mortise pocket and take my current trim spacing?
The lock case measures 5-7/8 x 4 x 15/16 inches (149 x 102 x 24mm), a standard heavy-gauge steel ANSI mortise case. Trim spacing is fixed: 3-5/8 inches (92mm) center to center from knob or lever to cylinder, and 2-7/16 inches (62mm) from knob or lever to thumbturn. Those two numbers are what decide whether existing escutcheons or a previously prepped door line up, so measure the door prep before you commit.
7) Will the ML2055 work with the key system already in my building?
It accepts new or existing Corbin Russwin key systems, and it takes most other manufacturers' cylinders, so a facility already keyed to another brand's system can usually keep its keyway. The Corbin Russwin standard for the series is a brass 6-pin L4 keyway cylinder, 0-bitted. It's a single cylinder keyed function, meaning one key side, outside.
8) Is a Grade 1 mortise lock overkill for a school classroom, or should I use a cylindrical lock?
For a classroom door that gets hit hundreds of times a day, a mortise body like the ML2055 is the right call over a cylindrical lock. It's ANSI/BHMA A156.13 Series 1000, Operational and Security Grade 1, and the ML2000 Series has been UL cycle tested past 14.5 million cycles (Verification ID V875753). It also carries a separate 1 inch stainless deadbolt in the same case, which a cylindrical lock cannot give you. Cylindrical is the cheaper, faster prep, but on a high-traffic institutional opening the mortise case is what survives the abuse.
9) How do I standardize classroom locks across a whole campus with the ML2000 Series?
One lockbody covers a lot of ground here. Twelve functions are configurable from a single ML2054 lockbody in the ML2000 Series, handing is field reversible, and the finish range spans 14 options from 605 bright brass through 626 satin chrome, 630 satin stainless, 722 black oxidized bronze oil-rubbed, and BSP black suede powder coat. That means one case, one finish decision, and trim selected per opening. Thru-bolted trim designs keep alignment consistent across a large rollout, and status indicator options are available on sectional and escutcheon trim if you want locked/unlocked visibility on classroom doors.
10) What's the difference between the Corbin Russwin ML2055 and the Accentra 8800FL mortise lock body?
Both are Grade 1 mortise lock bodies with field reversible handing, so either one lets you stock a single body for left and right hand openings. The ML2055 is specifically the classroom function, ANSI F05, and its case sits in the Corbin Russwin ML2000 Series with the trim, cylinder, and finish ecosystem that goes with it. The Accentra 8800FL Series body is the equivalent choice if the building is already standardized on Accentra trim and keying. If you're matching existing hardware, match the series you already have on the other doors rather than mixing cases and trim.
11) Is there a vandal resistant version of the ML2000 mortise lock for a rough building?
Yes, the ML2000VR Series option. It uses vandal-resistant stainless steel escutcheons with tapered edges and Torx pin tamper resistant screws, which takes away the flat edge someone pries on and the fastener heads a standard driver turns. For behavioral health openings the series also offers BHSS and BLSS trim designs. That's a trim-level choice, so specify it when you order the trim, not on the lockbody line.
12) Does the ML2055 come with an electric latch retraction option?
Not this one. The ML2055-LL is a mechanical lockbody with no electrical components. Motorized Electric Latch Retraction is offered on the ML20900 series, so if you need the latch to retract on a card read or a remote release, that's the series to specify instead of a plain ML2055 body.
13) Is a mortise lock body enough on its own, or is more hardware needed to complete the opening?
A lock body is the case that goes into the door pocket, not a finished lockset. The Corbin Russwin ML2055-LL and the Accentra 8800FL Series body are both sold this way, so either one still needs the trim, the cylinder, and the strike ordered alongside it. For the ML2055-LL the strike is an ANSI straight lip, 4-7/8" x 1-1/4" x 1-1/8", the latch is a 3/4" latchbolt, and the door thickness it is built for is 1-3/4". A buyer expecting a boxed lever set out of either part number is ordering a component, not an assembly.
14) What finish should I order to match the stainless hardware already on my doors?
For satin stainless, order 630; for bright stainless, 629. Satin chrome is 626 and bright chrome 625. The full range 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, 626, 629, 630, 722 black oxidized bronze oil-rubbed, and BSP black suede powder coat. 626 and 630 are the two that turn up most on commercial and institutional openings.
15) What is the ML2055 lock case made of, and what are the trim and strike materials?
The case is heavy-gauge steel. The deadbolt is one-piece stainless steel, and the armored front and strike come in wrought brass, bronze, or stainless steel depending on the finish you pick. Product substrate on the trim side is brass or bronze. On a coastal or high-humidity building, the stainless options (629 and 630) are the ones to specify.
How fast can I get the Corbin Russwin ML2055-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 ML2055-LL-626 come with a warranty?
Absolutely. The Corbin Russwin ML2055-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 ML2055-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 ML2055-LL-626 from ZenSupply?
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