Corbin Russwin ML2056 Grade 1 ...
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$907.09
Corbin Russwin Corbin Russwin ML2056 Mortise Classroom Lever Lockset COR-ML2056-KEYED

Corbin Russwin ML2056 Grade 1 Mortise Classroom Lever Lockset

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Model: COR-ML2056-NSA-626
From the ML2000_Series Collection
$1,566.92
$907.09
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  • Corbin Russwin ADDER-CORBIN RUSSWIN-[KEYING]=KD - Keyed Different ADDER-CORBIN RUSSWIN-[KEYING]=KD - Keyed Different
  • Corbin Russwin ADDER-CORBIN RUSSWIN-[KEYING]=KA - Keyed Alike ADDER-CORBIN RUSSWIN-[KEYING]=KA - Keyed Alike

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Corbin Russwin ML2056-KEYED Classroom Holdback Mortise Lever Lockset with Field Reversible Latchbolt

Grade 1 Commercial Mortise Lock for High-Traffic Classroom and Institutional Applications

The Corbin Russwin ML2056-KEYED is a Grade 1 mortise lockset from the ML2000 Series, engineered for demanding classroom holdback applications in commercial, institutional, industrial, and government environments. Featuring ANSI function F06, this lock allows the latchbolt to operate freely by grip from either side unless the outside grip is locked or unlocked by key, and the latchbolt can be held in a retracted position by key or released by key. Designed for 1-3/4" (44mm) standard door thickness, the lockset ships with an ANSI straight lip strike measuring 4-7/8" (124mm) x 1-1/4" (32mm) x 1-1/8" (29mm) lip to center. Constructed of heavy-gauge steel with a 1" stainless steel deadbolt, the ML2056 delivers life safety and security in a single door prep.

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
  • Government and Municipal Buildings
  • Hotels and Hospitality Properties
  • Industrial and Institutional Facilities
  • Multi-Tenant Residential and Mixed-Use Properties

Why Choose Corbin Russwin Quality?

Corbin Russwin ML2000 Series mortise locks deliver professional-grade reliability backed by heavy-gauge steel construction and a 1" stainless steel deadbolt, with UL Cycle testing completed at 14.5 Million Cycles (Verification ID: V875753) — well above and beyond standard requirements. The ML2056-KEYED is covered by a 10 Year Limited warranty, providing long-term confidence for facility managers and installers. Engineered for the most demanding commercial, institutional, and government applications where dependable performance and life safety are essential.

Product Specs

Subcategory:
Mortise Locks
Product Group:
Mechanical Locks
Series:
ML2000 Series
Grade:
Grade 1
Keyed Function:
Single Cylinder
Standard Cylinder:
Conventional 6-pin, L4 Keyway
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
ANSI/BHMA:
F06
Product Subgroup:
Mortise Locks and Trim
Product Type:
Mortise Locks
Keyed:
Yes
Commercial/Residential:
Commercial
Function Description:
Latchbolt by grip either side, unless outside grip is locked or unlocked by key. Latchbolt by key outside when outside grip is locked.
Lock Type:
Mortise
Handle Type:
Lever
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-NSA-626 – Frequently Asked Questions

1) What does the classroom holdback function on the Corbin Russwin ML2056 actually do?
The ML2056 is ANSI function F06. The latchbolt retracts by grip from either side unless the outside grip is locked by key from the outside. The holdback part is what separates it from a plain classroom lock: a key can hold the latchbolt in the retracted position so the door stays push-open during class changes or an event, then a key releases it. Inside grip always retracts the latch for egress.
2) Will the ML2056 mortise lock fit my 1-3/4 inch door?
Yes, 1-3/4 inches (44mm) is the standard door thickness for the ML2056, and the backset is 2-3/4 inches. The lock case is 5-7/8 x 4 x 15/16 inches, so the door needs a standard ANSI mortise pocket. Corbin Russwin does make optional thicknesses for this series if your door is heavier than 1-3/4 inches, which has to be specified when the lock is built.
3) Do I need to order the ML2056 handed, or can I reverse it in the field?
Order it and re-hand it on site. The ML2056 uses the patented Quick Reversible latchbolt, so handing changes without opening the lock case. One exception on the trim side: the Dirke (DS) lever is offered as a specific left hand or right hand lever, so that one has to be ordered for the door swing.
4) Will the ML2056 latch into the strike already in my frame, or do I have to change the frame prep?
The lock ships with an ANSI straight lip strike, 4-7/8 x 1-1/4 inches with 1-1/8 inch lip to center, which is the standard commercial frame cutout. If your frame already carries an ANSI-prepped mortise strike, it drops in. The latchbolt has a 3/4 inch throw with an anti-friction insert, plus a 9/16 inch effective throw deadlocking auxiliary latch and a 1 inch throw stainless deadbolt, so the strike box has to be deep enough for the deadbolt as well as the latch.
5) Can I key the ML2056 into the Corbin Russwin master key system already in my building?
Yes. The ML2056 works with new or existing Corbin Russwin key systems, and it accepts most other manufacturers' cylinders if your facility is standardized on another keyway. Standard build is a conventional 6-pin brass cylinder in the L4 keyway, shipped 0-bitted. If your locksmith is keying it, order LC (less cylinder); for interchangeable core systems there are CL6 (LFIC 6-pin less core) and CL7 (LFIC 7-pin less core) options. Keying is specified as KD keyed different or KA keyed alike when you want a run of doors on one key.
6) Is the ML2056 approved for a fire rated classroom door?
It is UL/cUL listed to UL10C positive pressure, rated for 3-hour fire doors up to 4 x 10 feet single or 8 x 10 feet pair. It is also listed as ADA A117.1 compliant with lever trim, California State Fire Marshal accepted, and windstorm/hurricane certified. Grade is ANSI/BHMA A156.13 Series 1000, Operational and Security Grade 1.
7) We need a lockdown or intruder function rather than classroom holdback. What is the alternative to the ML2056?
The BEST 45HCA Series 45HCAINL is a heavy duty mortise lockbody with an intruder function, and the TownSteel FME-4000 is a Grade 1 heavy duty electronic intruder classroom mortise lockset with RFID technology for 1-3/4 inch doors. The Corbin Russwin ML2056 is classroom holdback, where the outside grip is locked or unlocked by key and the latchbolt can be held retracted by key, so lockdown is performed from the corridor side with a key rather than from inside the room.
8) We want keypad access on classroom doors instead of a key-only mortise lock. What replaces the ML2056?
The Corbin Russwin ML2056 is a non-electronic mortise lock keyed with a conventional 6-pin L4 cylinder. For credential-based classroom access, the Alarm Lock DL3500CR is a Grade 1 electronic Trilogy mortise lock with classroom function and 300 user codes, and the Alarm Lock DL2700CR is a Grade 1 Trilogy T2 electronic mortise lock with classroom function and a weatherproof design; both fit doors 1-5/8 to 1-7/8 inch. The ML2056 is specified for 1-3/4 inch doors, so verify the leaf thickness before switching families.
9) Is a Baldwin 6310 mortise lock interchangeable with the Corbin Russwin ML2056?
No. The Baldwin 6310 entry/storeroom mortise lock body uses a 2-1/2 inch backset and suits doors 1-3/8 inch and over, and the 6310190RRLS is the right hand reverse lever version. The Corbin Russwin ML2056 uses a 2-3/4 inch backset on a 1-3/4 inch door and ships with an ANSI straight lip strike, 4-7/8 by 1-1/4 by 1-1/8 inch. The different backset means a different mortise pocket location, so the two are not a drop-in swap.
10) We need an electrified mortise lock on a few of the same doors as our ML2056 classrooms. What matches?
The Corbin Russwin ML2056 is a mechanical lock with no electrical option in its keyed classroom configuration. For electrified openings on the same door prep, the Command Access ML190 is a heavy-duty motorized mortise lock with field selectable EL/EU operation and 24VDC power in a storeroom function, the BEST 45HW is a heavy duty wired electromechanical mortise lock with 12V/24V operation, and the Schlage L9092EU with 03A trim is a heavy duty electric lock/unlock outside lever mortise lock, keyed outside, with request to exit, for 1-3/4 inch doors.
11) What do I have to specify when ordering an ML2056 besides the finish?
Four things decide the part: lever design (Armstrong, Citation, Dirke, Essex, Lustra, Newport, Princeton or Regis), rose or escutcheon (A rose at 2-1/4 inch diameter, F rose at 2-7/8 inch, or M or N escutcheon), cylinder configuration (standard 6-pin L4, LC less cylinder, CL6 or CL7 LFIC less core), and keying (KD keyed different or KA keyed alike). Finish choices run from 605 bright brass through 630 satin stainless to 722 oil-rubbed black bronze and BSP black suede powder coat, 14 in all.
12) Will the ML2056 lever trim match the other Corbin Russwin openings in my building?
If the rest of your doors are ML2000 Series, yes. The ML2056 shares the same lever families and rose/escutcheon options as the rest of the series, and the finish list covers the common commercial ranges (626 satin chrome, 630 satin stainless, 613 oil-rubbed bronze, 606 satin brass among them), so a replacement on one door can match the corridor. Trim is thru-bolted for alignment. For behavioral health or indicator needs the series also offers Museo, Vineyard, and BHSS/BLSS trims and status indicator options on sectional and escutcheon trim.
13) How does the ML2056 compare to other Grade 1 classroom mortise locks if I want a mechanical lock rather than electronic?
The ML2056 is a purely mechanical, non-electronic classroom holdback lock. The closest all-mechanical Grade 1 classroom mortise alternative we carry is the Cal-Royal NM8070, also Grade 1 for 1-3/4 inch doors with an auxiliary deadlatch. If you want visible lock status on the trim, the Marks USA LA318GJ is a Grade 1 classroom security indicator mortise lockset for 1-3/4 inch doors. Go electronic only if you need codes or credentials: the Alarm Lock DL3500CR is a Grade 1 classroom electronic mortise for 1-5/8 to 1-7/8 inch doors, and the TownSteel FME-2000 is a Grade 1 RFID classroom mortise for 1-3/4 inch doors.
14) Do I need a thumbturn cutout in the door for the ML2056, and where does the cylinder sit relative to the lever?
Spacing on the ML2056 is 3-5/8 inches (92mm) center to center from lever to cylinder, and 2-7/16 inches (62mm) lever to thumbturn if a thumbturn is used. The armored front is 8 x 1-1/4 inches in wrought brass, bronze, or stainless. The ML2056 classroom holdback function is key operated from the outside with a single cylinder, so the inside face does not require a thumbturn for the lock to work.
15) What is the difference between the ML2056 and a storeroom mortise lock like the Accentra 8805FL?
Function. The Accentra 8805FL is a Grade 1 storeroom mortise lock from the 8800 Series with an Arcadia lever, and storeroom trim keeps the outside lever locked at all times with entry by key. The Corbin Russwin ML2056 is classroom holdback: the latchbolt operates by grip from either side unless the outside grip is locked or unlocked by key, and the latchbolt can be held retracted by key. Use the storeroom function where the door must always secure behind the user, and the ML2056 where staff need to set the opening open or locked with a key.
16) Can I use the Cal-Royal NM8080 or NM8050 in place of the ML2056 on a classroom door?
Only if you are changing the function. The Cal-Royal NM8080 is a Grade 1 storeroom mortise lockset with an interchangeable core option and the NM8050 is a Grade 1 office/entrance mortise lockset with an auxiliary deadlatch, both for 1-3/4 inch doors. The Corbin Russwin ML2056 is the classroom holdback function, ANSI F06. For a like-for-like classroom replacement in the Cal-Royal line, the NM8070 is the classroom lockset.
17) Is the TownSteel FME-2000 a substitute for the Corbin Russwin ML2056?
They cover the same opening but not the same credential. The TownSteel FME-2000 is a Grade 1 heavy duty classroom mortise lockset with RFID technology for 1-3/4 inch doors. The ML2056 is a mechanical Grade 1 classroom holdback lock for 1-3/4 inch doors with a conventional 6-pin L4 keyway cylinder, and it is also offered less cylinder or prepped for LFIC 6-pin and 7-pin cores. Pick the FME-2000 if the facility is moving to card credentials, the ML2056 if the classrooms stay on a master key system.
18) What mortise lock should I use on the non-keyed doors in the same corridor as my ML2056 classrooms?
For passage openings, the Schlage PM010 is a Grade 1 non-keyed passage latch mortise lock for 1-3/4 inch doors and the Falcon MA101 is a Grade 1 heavy duty mortise passage lock with field reversible operation and a fire rating. The Corbin Russwin ML2056 is the keyed classroom holdback function with a single cylinder, so pairing it with a passage mortise lock keeps a consistent mortise door prep down the corridor. The ML2056 is also field reversible for handing.
19) For dorm rooms rather than classrooms, what mortise lock takes the place of the ML2056?
The Sargent 7925 is a Grade 1 heavy duty dormitory exit function mortise lock from the 7900 Series with rose trim and a single cylinder deadbolt. The Corbin Russwin ML2056 is the classroom holdback function and is a single cylinder keyed lock. Both are Grade 1 mortise locks; the difference is that the dormitory function is built around occupant-controlled deadbolt security while the ML2056 is built around key control of the outside lever from the corridor.
20) What looks like a substitute for the ML2056 but is not a classroom lock at all?
Several mortise-family items share the word mortise without giving you a keyed classroom lever. The Sargent 130KB and 130W are mortise thumbturns, the Sargent 4874 is a double cylinder mortise deadbolt with a 2-3/4 inch backset, the Schlage L0170 is a Grade 1 half dummy mortise lever trim with no latch, and the Emtek 3102 Memphis and 3104 Hamilton are dummy mortise entrance locksets. The Corbin Russwin ML2056 is a keyed Grade 1 classroom holdback lever lockset with a 3/4 inch latchbolt and a 1 inch stainless steel deadbolt.
21) For behavioral health rooms we cannot use a standard lever. What mortise options replace the ML2056 there?
The TownSteel MRX-L-01 is a Grade 1 heavy duty anti-ligature lever mortise lockset in stainless steel with a passage function for 1-3/4 inch doors, the MRX-A-01 is the ligature resistant arch trim passage version, and the Marks USA 5PDN is a Grade 1 hospital passage mortise push/pull paddleset that is ligature resistant and ADA compliant in satin stainless steel. The Corbin Russwin ML2056 is offered with Behavioral Health BHSS and BLSS trim designs alongside its standard lever options, so the choice may come down to whether you need a keyed classroom function or a passage function on that room.
22) Is the ML2056 lock body the same one used for other ML2000 functions?
Yes, and that is useful for stocking. The ML2000 multi-function body covers 12 functions from a single ML2054 lockbody, so a school or campus can standardize on one case and change function rather than carrying a separate lock for every opening. The door prep is the same ANSI mortise pocket with a 2-3/4 inch backset either way.
23) How durable is the ML2056 for a high traffic school corridor?
Heavy-gauge steel lock case, a one-piece stainless steel deadbolt with 1 inch throw, and UL cycle testing completed at 14.5 million cycles (Verification ID V875753), well past the ANSI/BHMA A156.13 Grade 1 requirement it is certified to. The two-piece latchbolt carries an anti-friction insert so it closes with less force, which matters on doors with closers and stack pressure.
24) Which mortise lock do I use for the bathrooms if the classrooms are getting the ML2056?
For privacy openings, the Cal-Royal NM8440 is a Grade 1 heavy duty privacy mortise lockset with deadbolt for 1-3/4 inch doors, and the Hager 3840S is a Grade 1 privacy mortise lock with a 2-3/4 inch backset for doors 1-3/4 to 2 inch. Both share the 2-3/4 inch backset and 1-3/4 inch door thickness the Corbin Russwin ML2056 is specified for, so one door prep serves the corridor while the ML2056 covers the keyed classroom doors.
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Does the Corbin Russwin COR-ML2056-NSA-626 come with a warranty?
Absolutely. The Corbin Russwin COR-ML2056-NSA-626 is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
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