Corbin Russwin ML2042 Grade 1 ...
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$1,706.35
$979.00
Corbin Russwin Corbin Russwin ML2042 Mortise Entrance or Public Restroom Lockset COR-ML2042-KEYED

Corbin Russwin ML2042 Grade 1 Mortise Entrance or Public Restroom Lockset

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Model: COR-ML2042-NSA-626
From the ML2000_Series Collection
$1,706.35
$979.00
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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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$1,706.35
$979.00
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Corbin Russwin ML2042-KEYED ML2000 Series Grade 1 Mortise Entrance & Public Restroom Lock, Field Reversible

Commercial-Grade Mortise Security for High-Traffic Entrance and Public Restroom Applications

The Corbin Russwin ML2042-KEYED is a Grade 1 mortise lockset from the ML2000 Series, engineered for demanding entrance and public restroom applications in commercial, institutional, industrial, and government facilities. Conforming to ANSI function F09, this lock allows latchbolt retraction by grip from either side unless the outside grip is locked by key from inside, with the inside grip always remaining free for safe egress. Constructed of heavy-gauge steel with a 1" stainless steel deadbolt and a 3/4" latchbolt, it is designed for 1-3/4" (44mm) standard door thickness and features a field-reversible handing mechanism. The ML2000 Series has been UL cycle tested to an exceptional 14.5 Million Cycles (Verification ID: V875753), delivering unmatched long-term reliability for 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

  • Commercial Office Buildings
  • Educational Facilities and Schools
  • 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 stainless steel escutcheons with tapered edges and Torx® pin tamper-resistant screws, providing a vandal-resistant barrier for high-abuse environments. 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, a 1" stainless steel deadbolt, and a patented Quick Reversible latchbolt — all UL cycle tested to an outstanding 14.5 Million Cycles (Verification ID: V875753). Backed by a 10 Year Limited warranty and available in a wide variety of trim designs and finishes, the ML2042 is engineered for demanding commercial applications where dependable performance and long-term security are essential.

Product Specs

Subcategory:
Mortise Locks
Product Group:
Mechanical Locks
Series:
ML2000 Series
Grade:
Grade 1
Keyed Function:
Double Cylinder
Standard Cylinder:
Conventional 6-pin, L4 Keyway, 0 Bitted Keying
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:
F09
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 by key from inside. Latchbolt by key outside when outside grip is locked. Auxiliary latch deadlocks"
Lock Type:
Mortise
Lock Function:
Entrance/Public Restroom
Product Attribute:
Mortise Locks
Electronic:
No
Product Model:
ML2042
Collection:
ML2000_Series
Product Function:
Entrance/Public Restroom
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-ML2042-NSA-626 – Frequently Asked Questions

1) How does the Corbin Russwin ML2042 mortise lock actually function on a public restroom door?
The ML2042 is ANSI function F09. The latchbolt retracts by the grip from either side unless the outside grip is locked by key from inside, and once locked the outside opens by key only. The inside grip is always free for egress, so someone can walk out of the restroom even when it's locked from within. The auxiliary latch deadlocks the latchbolt against carding.
2) Will the ML2042 fit my existing mortise pocket and 2-3/4 inch backset prep?
It's built for a standard ANSI mortise prep: 2-3/4 inch backset, lock case 5-7/8 x 4 x 15/16 inches, and an 8 x 1-1/4 inch armored front. Door thickness is 1-3/4 inch standard. Center to center from knob/lever to cylinder is 3-5/8 inches and knob/lever to thumbturn is 2-7/16 inches, so if your existing door is cut for those hole centers the ML2042 drops into the same pocket.
3) Will the ML2042 latch into the strike already in my frame?
The latchbolt throws 3/4 inch (19mm) and the deadbolt throws a full 1 inch, with a 9/16 inch effective auxiliary latch. 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. If your frame already has a standard 4-7/8 inch ANSI strike cutout you can reuse it, but the frame has to be pocketed deep enough for the 1 inch deadbolt, which many latch-only preps are not.
4) Do I have to order the ML2042 handed, or can I reverse it in the field?
Handing is field reversible. The ML2000 Series uses a Quick Reversible latchbolt, so you re-hand it without opening the lock case. One exception on trim: the Dirke lever is a handed lever and comes as a left hand or a right hand part, so that choice you do make when ordering.
5) Can the ML2042 be keyed into the Corbin Russwin system we already run in the building?
Yes. It works with new or existing Corbin Russwin key systems and accepts most other manufacturers' cylinders. Standard is a conventional 6-pin brass cylinder in the L4 keyway, shipped 0-bitted. If you key your own, order LC (less cylinder). For interchangeable core houses 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 group of doors on one key.
6) Is the ML2042 rated for a fire door?
It is UL/cUL listed and UL10C positive pressure rated, good for a 3-hour fire door up to 4 by 10 feet single or 8 by 10 feet pair. It also meets ADA A117.1 and carries California State Fire Marshal and windstorm/hurricane certification, which matters if you're specifying for a coastal or state-inspected facility.
7) What is the closest equivalent to a Corbin Russwin ML2042 entrance mortise lock from another manufacturer?
The ML2042 is a Grade 1 mortise lock in the entrance/public restroom function, fitting a 1-3/4 inch door. The nearest peers in the same duty class and door thickness are the Cal-Royal NM8050, a heavy duty Grade 1 office/entrance mortise lockset with auxiliary deadlatch for a 1-3/4 inch door, and the BEST 45HCAC heavy duty mortise lock body in the public entrance function, which like the ML2042 is field reversible. The Cal-Royal is a complete lockset with trim; the BEST 45HCAC is a lock body, so trim is specified separately.
8) I need a mortise lock that stays locked from the outside at all times - is the ML2042 right?
No. The ML2042 retracts the latchbolt by grip from either side unless the outside grip is locked by key from the inside, so the outside lever is free until someone deliberately locks it. For an opening that must stay secured outside at all times with key entry only, use a storeroom function instead: the Accentra 8805FL is a Grade 1 storeroom mortise lock with Arcadia lever, and the Cal-Royal NM8080 is a heavy duty Grade 1 storeroom mortise lockset for a 1-3/4 inch door with an interchangeable core option.
9) How does the ML2042 compare to the Baldwin 6301 entry/apartment mortise lock?
Backset is the deciding difference. The ML2042 uses a 2-3/4 inch (70mm) backset on a 1-3/4 inch door. The Baldwin 6301, available knob by knob or lever by lever, is a 2-1/2 inch backset entry/apartment mortise lock body for doors 1-3/4 inch and over. A 2-1/2 inch backset body will not drop into a pocket cut for a 2-3/4 inch backset without rework, so check the existing prep before substituting either direction.
10) Is this lock heavy enough for a high traffic restroom or school corridor?
It's ANSI/BHMA A156.13 Series 1000, Operational and Security Grade 1, the highest commercial grade, with a heavy-gauge steel case and a one-piece stainless deadbolt. Corbin Russwin has UL cycle tested the ML2000 Series to 14.5 million cycles (Verification ID V875753), well past the Grade 1 minimum. The anti-friction two-piece latchbolt also reduces the force needed to close the door, which helps on doors with strong closers.
11) What do I have to pick when ordering an ML2042 besides the lock itself?
Four decisions. Lever design: Armstrong, Citation, Dirke, Essex, Lustra, Newport, Princeton or Regis. Trim style: A rose at 2-1/4 inch diameter, F rose at 2-7/8 inch, or M or N escutcheon. Finish, from 605 bright brass through 626 satin chrome, 630 satin stainless and BSP black suede powder coat. Then cylinder type and keying. Trim is thru-bolted for alignment.
12) My doors are 1-5/8 to 1-7/8 inch. Can I still use the ML2042?
Standard build is 1-3/4 inch (44mm) door thickness, with optional thicknesses available from the factory. If your openings vary, that has to be called out on the order rather than assumed. For reference, the Alarm Lock Trilogy DL2700CR and DL3500CR mortise locks are specified for a 1-5/8 to 1-7/8 inch range, but those are electronic classroom-function locks, not a keyed F09 entrance lock.
13) Can the ML2042 be electrified for access control?
No, as ordered the ML2042 is a mechanical lock with no electrical option built in. Motorized Electric Latch Retraction is offered on the ML20900 series instead. If you need an electrified mortise lock on that opening, the Command Access ML190 Series is a motorized mortise lock with field selectable fail safe or fail secure on 24VDC, and the Schlage L9092EU with 03A trim is an electrically unlocked mortise lock with request to exit on 12/24VDC.
14) Does the ML2042 have a deadbolt, and is it double cylinder?
Yes, a one-piece stainless steel deadbolt, 19/32 by 1-1/4 inch with a 1 inch throw, and the keyed function is double cylinder. On a restroom or entrance door that means the deadbolt is operated by key, not just a thumbturn, so plan the frame strike depth and your keying accordingly.
15) I want to standardize a whole building on one mortise lock body. Does the ML2000 Series let me do that?
It does. Twelve functions can be configured from a single ML2054 lockbody, so a facility can stock one body and change function rather than carry a dozen part numbers. Trim and finish stay consistent across the openings, and the same series covers other functions you'd need down the hall. Keyed alike (KA) is available when a group of doors should share one key.
16) The restroom door does not need a key at all - what is a simpler mortise lock than the ML2042?
The ML2042 is a keyed double cylinder lock, which is more than a plain washroom or bedroom door needs. For non-keyed privacy in a mortise prep, the Cal-Royal NM8440 is a heavy duty Grade 1 privacy mortise lockset with deadbolt for a 1-3/4 inch door, and the Hager 3840S is a Grade 1 privacy mortise lock with a 2-3/4 inch backset covering 1-3/4 to 2 inch doors. If the door only needs to latch with no locking at all, the Schlage PM010 is a Grade 1 non-keyed passage latch mortise lock for a 1-3/4 inch door.
17) Can I use an electronic mortise lock in place of the ML2042 on the same door?
The ML2042 is a mechanical lock with no electronic components, keyed with a conventional 6-pin L4 keyway cylinder. If the opening needs credential access instead of keys, mortise-prep alternatives include the Schlage CO-100 standalone electronic mortise lock with keypad reader in privacy function for a 1-3/4 inch door, the TownSteel FME-2000, a Grade 1 mortise lockset with RFID technology in classroom function for a 1-3/4 inch door, and the Dormakaba E-Plex E5086 Grade 1 pushbutton and card entry/egress mortise lock. Note that these carry their own functions, so confirm the function matches the entrance behavior you want before swapping.
18) Is a Sargent 4874 mortise deadbolt a substitute for the ML2042?
No. The Sargent 4874 is a double cylinder mortise deadbolt with a 2-3/4 inch backset - deadbolt only, with no latch and no lever operation. The ML2042 is a complete entrance lockset with a 3/4 inch latchbolt plus a deadbolt, operated by lever trim on both sides. The same applies to the Alarm Lock DL4500, a Grade 1 electronic mortise deadbolt. A deadbolt-only product will not latch the door or provide handle egress.
19) For a behavioral health or psychiatric unit, is the ML2042 the right mortise lock?
The ML2042 is offered with Behavioral Health trim options (BHSS/BLSS) within the ML2000 Series. If a dedicated anti-ligature lockset is specified, peers include the TownSteel MRX-L-01, a Grade 1 heavy duty stainless steel anti-ligature lever mortise lockset in passage function for a 1-3/4 inch door, the MRX-A-01 with ligature resistant arch trim in passage function, and the Marks USA 5PDN, a Grade 1 ligature resistant hospital passage push/pull paddleset in satin stainless steel. Those three are passage function, so they do not key or lock the way the ML2042 does.
20) Does the ML2042 need Corbin Russwin keys, or can I keep my existing key system?
The ML2042 ships standard with a conventional 6-pin L4 keyway cylinder, 0-bitted, and can be used with new or existing Corbin Russwin key systems while also accepting most other manufacturers' cylinders. It can also be ordered less cylinder or less core for LFIC 6-pin or 7-pin. That flexibility is worth weighing against a peer like the Cal-Royal NM8080 Grade 1 storeroom mortise lockset, which offers an interchangeable core option, if you are standardizing a facility on one core format.
21) Is a cylindrical lock an acceptable substitute for the ML2042?
Only if the door prep changes. The ML2042 is a mortise lock, installed in a pocket cut into the door edge with a 5-7/8 by 4 by 15/16 inch lock case. A cylindrical lock such as the Schlage PC10 Grade 1 passage cylindrical lock with rose for a 1-3/4 inch door uses cross-bore prep instead, and cannot be dropped into a mortise pocket. If the existing doors are mortise-prepped, stay with a mortise body.
22) I need electric lock and unlock on the outside lever - what replaces the ML2042?
The ML2042 is a mechanical lockset with no electronic operation. For electrified control of the outside lever on a mortise opening, the Schlage L9092EU with 03A trim is a heavy duty corridor function mortise lock, keyed outside, with request to exit and 12/24VDC operation for a 1-3/4 inch door. The Command Access ML190 is a heavy duty motorized mortise lock in storeroom function with field selectable EL/EU operation on 24VDC, and the BEST 45HW is a wired electromechanical heavy duty mortise lock with 12V/24V operation.
23) For a hall or closet door in the same building as my ML2042 openings, what matching mortise lock do I use?
Passage function is the counterpart for doors that only need to latch. The Falcon MA101 is a Grade 1 heavy-duty fire rated mortise passage lock with field reversible operation, matching the ML2042's field reversible handing. The Hager 3810S offers passage with rose trim and the 3810E with escutcheon, both on a 2-3/4 inch backset for 1-3/4 to 2-1/2 inch doors - the same 2-3/4 inch backset the ML2042 uses, so the door prep carries across.
24) What mortise lock gives me a classroom intruder function that the ML2042 does not?
The ML2042 locks the outside grip by key from inside, but it is an entrance and public restroom function rather than a dedicated intruder lock. For lockdown from inside the room, the BEST 45HCA is a heavy duty mortise lockbody in intruder function, and the TownSteel FME-4000 is a Grade 1 heavy duty electronic intruder classroom mortise lockset with RFID technology for a 1-3/4 inch door.
25) Is there a vandal resistant version for a public restroom that gets abused?
The ML2000VR option uses stainless steel escutcheons with tapered edges and Torx pin tamper-resistant screws. Paired with Corbin Russwin patented Pyramid or Access 3 high-security cylinders it's a reasonable answer for a high-abuse public opening. There are also Behavioral Health trims (BHSS/BLSS) in the series if the concern is ligature rather than vandalism.
26) Can I get status indicators showing locked or unlocked on the ML2000 trim?
Status indicator options are offered on both sectional and escutcheon trim in the ML2000 Series, giving visible locked/unlocked feedback at the door. That's a common ask on public restrooms and on rooms where occupants need to confirm the outside is secured without testing the lever. If indication with a classroom security function is what you're after, the Marks USA LA318GJ is a classroom security indicator mortise lockset.
27) Are the Emtek mortise entrance locksets an alternative to the ML2042?
They are not functional substitutes. The Emtek 3019 Brisbane, 3102 Memphis, 3104 Hamilton and 3106 Manhattan mortise entrance locksets are dummy function - fixed trim with no latch or locking operation, typically used on an inactive leaf. The ML2042 is a keyed Grade 1 entrance and public restroom lock that latches and locks. For dummy trim on a mortise opening, the Schlage L0170 half dummy lever trim is another Grade 1 option for a 1-3/4 inch door.
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Does the Corbin Russwin COR-ML2042-NSA-626 come with a warranty?
Absolutely. The Corbin Russwin COR-ML2042-NSA-626 is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
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