Corbin Russwin ML2056 Grade 1 ...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$676.75
$391.64
Corbin Russwin Corbin Russwin ML2056 Classroom Holdback - Mortise Lockbody Only COR-ML2056-LL

Corbin Russwin ML2056 Grade 1 Classroom Holdback - Mortise Lockbody Only

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Model: COR-ML2056-LL-626
From the ML2000_Series Collection
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$676.75
$391.64
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Corbin Russwin ML2056-LL Classroom Holdback Mortise Lockbody - Grade 1, Field Reversible, ANSI F06

Commercial-Grade Classroom Holdback Mortise Lock for High-Traffic Institutional Applications

The Corbin Russwin ML2056-LL is a Grade 1 Classroom Holdback Mortise Lockbody from the ML2000 Series, engineered to meet the demanding requirements of commercial, institutional, industrial, and government environments. Conforming to ANSI function F06, this lockbody allows the latchbolt to be operated by grip from either side unless the outside grip is locked or unlocked by key, and the latchbolt can be held in a retracted (holdback) position by key or released by key. Constructed of heavy-gauge steel with a 1" stainless steel deadbolt and patented Quick Reversible latchbolt, the ML2056-LL is designed for 1-3/4" (44mm) door thickness and is field reversible for flexible installation. Note: Not approved for use on U.L. fire listed applications.

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 Classrooms
  • Healthcare Institutions and Medical Offices
  • Commercial Office Buildings
  • Government and Municipal Buildings
  • Institutional and University Campuses
  • Industrial and Warehouse Facilities
  • Hotels and Multi-Tenant Residential Properties

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 an extraordinary 14.5 Million Cycles in UL Cycle testing (Verification ID: V875753). Backed by a 10 Year Limited warranty and featuring the patented Quick Reversible latchbolt, the ML2056-LL is engineered for demanding commercial and institutional applications where dependable performance and life safety 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 Holdback
Product Attribute:
Mortise Locks
Electronic:
No
Product Model:
ML2056
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 COR-ML2056-LL-626 – Frequently Asked Questions

1) Will the Corbin Russwin ML2056 classroom mortise lock fit a 1-3/4 inch door?
Yes, 1-3/4 inch (44mm) is the standard door thickness for the ML2056-LL lockbody, which is the commercial standard for hollow metal and solid core doors. Optional thicknesses are available if your openings are thicker. The lockcase itself measures 5-7/8 x 4 x 15/16 inches, so the door needs a mortise pocket cut to accept it, and the armored front is 8 x 1-1/4 inches.
2) What does classroom holdback function actually do on a mortise lock?
With ANSI F06 classroom holdback, the latchbolt works by grip from either side unless the outside grip is locked by key. The holdback part is what separates it from plain classroom function: a key can hold the latchbolt retracted so the door pushes freely open, and a key releases it back. That is how a school keeps a classroom door on free passage during the day and locks down from the corridor side with the key. There is no inside button or turn to fumble with, which is the point in an institutional setting.
3) Do I need to order the Corbin Russwin ML2056 handed, or can it be reversed in the field?
Handing is not a problem here. The ML2056 uses Corbin Russwin's patented Quick Reversible latchbolt, so the hand can be changed without taking the lock case apart. You can stock one lockbody and put it on a left or right hand opening as the job requires.
4) Does the ML2056 come with the lever, trim, and cylinder, or is it just the lock body?
Lockbody only. What you get is the mortise case itself, so you still have to order trim (lever or knob, sectional or escutcheon), the cylinder, and typically the strike to complete the opening. The ML2000 trim range includes Museo, Vineyard, and Behavioral Health (BHSS/BLSS) designs, and status indicator trim is offered on sectional and escutcheon styles. Standard cylinder for the series is a brass 6-pin L4 keyway, 0-bitted.
5) Can I use the ML2056 on a fire rated door?
No. The ML2056-LL is specifically not approved for U.L. fire listed applications, so keep it off rated openings. Other functions in the ML2000 Series are UL/cUL listed for UL10C positive pressure on 3-hour fire doors up to 4 x 10 feet single or 8 x 10 feet pair, so if the opening is rated you need one of those functions instead of the 2056.
6) Will the ML2056 latch into the strike and prep already in my frame?
It depends on what is in the frame now. The lock is a 2-3/4 inch backset with a 3/4 inch (19mm) throw two-piece anti-friction latchbolt, plus a 9/16 inch effective throw deadlocking auxiliary latch and a 1 inch throw stainless deadbolt. The matching strike is an ANSI straight lip at 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 prep at a 2-3/4 inch backset, it lines up. A 2-3/8 inch backset bored-door prep will not work at all, since this is a mortise case, not a cylindrical lock.
7) What is the Accentra equivalent to a Corbin Russwin ML2056 mortise lock body?
The Accentra 8800FL Series mortise lock body is the closest cross-brand counterpart. Both are Grade 1 mortise lock bodies, and both ship field reversible, so handing is set at the opening rather than at the order. The Corbin Russwin ML2056 is the classroom holdback function, so when you cross to the 8800FL body you need to confirm the function on the Accentra side matches the classroom holdback behavior you are replacing. A mortise body swap also means confirming the pocket, backset and armored front line up with what is already cut into the door.
8) I need a mortise lock on a fire rated door - is the ML2056 classroom holdback the right choice?
No. The ML2056 classroom holdback function is not approved for U.L. fire listed applications, because the holdback feature keeps the latchbolt retracted by key. For a fire rated opening, use a mortise body in a function that latches on every close - the ML2000 Series covers those functions, and the Accentra 8800FL Series Grade 1 mortise body is the cross-brand alternative to specify against. The Grade 1 rating is the same either way; it is the function, not the body, that rules the holdback out of a fire opening.
9) Does the Corbin Russwin ML2056 have to be keyed to a Corbin Russwin key system?
No. The ML2000 lockbody works with new or existing Corbin Russwin key systems and also accepts most other manufacturers' cylinders, so a building already keyed to another brand's system can usually take its own cylinder. Standard supply is a brass 6-pin L4 keyway, 0-bitted, which lets a locksmith key it on site. It is a single cylinder keyed function, keyed from the outside only.
10) Is a mortise lock like the ML2056 worth it over a cylindrical lock for a school corridor?
For high-traffic institutional doors, yes. A mortise case sits inside a pocket in the door edge and carries a separate deadbolt (1 inch throw stainless here) alongside the latch, where a cylindrical lock is a through-bore latch only. The ML2056 is ANSI/BHMA A156.13 Series 1000 Grade 1 for both operational and security, and was cycle tested to 14.5 million cycles. The trade-off is prep: a mortise pocket is more work to cut, and you cannot drop a mortise case into an existing 2-1/8 inch bored door without a new prep.
11) Can one ML2000 lockbody cover more than one lock function?
Yes. The ML2000 platform is multi-function, with 12 functions configurable from a single ML2054 lockbody. For a facility standardizing its hardware, that cuts how many distinct lock bodies you have to stock across storeroom, office, classroom, and passage openings.
12) Is the ML2056 an electrified lock, and does it work with electric latch retraction?
The ML2056 is a mechanical, non-electronic lockbody. Motorized Electric Latch Retraction (MELR) is a feature of the ML20900 series, not this one, so if the job calls for access control release or latch retraction on a signal you need the ML20900 rather than the 2056.
13) Does the ML2056 meet ADA requirements for accessible openings?
The ML2000 Series is certified to ADA A117.1, and it is also listed for California State Fire Marshal and windstorm/hurricane certification. Bear in mind ADA compliance at the opening also depends on the trim you pair with it, since a lever meets the accessible operable-parts requirement where a knob does not.
14) How far apart are the lever and cylinder holes for prepping the door for an ML2000 mortise lock?
Center to center from the knob or lever to the cylinder is 3-5/8 inches (92mm), and knob or lever to thumbturn is 2-7/16 inches (62mm). Those are the numbers you need when laying out trim holes or checking whether an existing mortise prep from another lock will line up with the ML2056. The armored front is 8 x 1-1/4 inches.
15) Can I standardize a building on one Grade 1 mortise lock body across both Corbin Russwin and Accentra doors?
Both the Corbin Russwin ML2056 and the Accentra 8800FL Series body are Grade 1 mortise lock bodies, so the performance tier is the same on either side of a mixed facility. What does not carry across is keying and trim: the ML2056 is a keyed single cylinder body that runs on Corbin Russwin key systems and accepts most other manufacturers' cylinders, so a facility standardizing on one key system usually picks the body that matches the cylinders already in the building rather than mixing bodies door to door. Standardize the function first, then the cylinder, then the trim.
16) Does ordering the Accentra 8800FL body instead give me a complete lockset?
No. The Accentra 8800FL Series is a mortise lock body, the same scope as the Corbin Russwin ML2056 - the case that goes into the door pocket, without the lever or knob trim and without the cylinder. Whichever brand you cross to, the trim, cylinder and strike are separate lines on the order. Buyers who think they are swapping a whole lockset usually come up short on the trim, so price and specify the body, trim and cylinder together.
17) The existing lock is left hand - do I have to order a handed mortise body?
Not with either of these. The Corbin Russwin ML2056 is field reversible, re-handed without disassembling the lock case, and the Accentra 8800FL Series body is field reversible as well. For a locksmith carrying stock or a property manager covering doors that swing both ways, one part number covers both hands, so handing is confirmed at the door rather than at the time of order.
18) What finishes does the Corbin Russwin ML2056 mortise lockbody come in?
Fourteen finishes, spanning brass, bronze, nickel, chrome, and stainless: 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. If you are matching existing hardware across a building, 626 satin chrome and 630 satin stainless are the two usual commercial standards. Base substrate is brass or bronze.
How fast can I get the Corbin Russwin COR-ML2056-LL-626 delivered?
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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 COR-ML2056-LL-626 come with a warranty?
Absolutely. The Corbin Russwin COR-ML2056-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 COR-ML2056-LL-626?
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