Corbin Russwin ML2012 Grade 1 ...
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$786.14
$458.68
Corbin Russwin ML2012 Mortise Double Cylinder Deadlock

Corbin Russwin ML2012 Grade 1 Mortise Double Cylinder Deadlock

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Model: ML2012-626
From the ML2000_Series Collection
$786.14
$458.68
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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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$458.68
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Corbin Russwin ML2012 Mortise Cylinder x Thumbturn Deadlock | Grade 1, Field Reversible, 10-Year Warranty

Commercial-Grade Mortise Deadlock with Patented Quick Reversible Latchbolt for High-Traffic Applications

The Corbin Russwin ML2012 is a Grade 1 mortise lock from the ML2000 Series, engineered to meet the demanding requirements of high-traffic commercial, institutional, industrial, and government environments. Featuring a Cylinder x Thumbturn function — keyed entry from outside and thumbturn operation inside — this deadlock is constructed of heavy-gauge steel with a 1" stainless steel deadbolt and a 3/4" latchbolt. Designed for 1-3/4" door thickness and rated to an exceptional 14.5 million cycles (UL Cycle Verification ID: V875753), the ML2012 delivers long-term reliability backed by a 10-Year Limited Warranty.

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
  • Industrial and Warehouse Facilities
  • Government and Municipal Buildings
  • Multi-Tenant Residential and Institutional 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 a formidable barrier against abuse and unauthorized access attempts. When paired with Corbin Russwin's patented high-security Pyramid or Access 3® cylinders, the ML2012 transforms any door into a robust security barrier.

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 to an extraordinary 14.5 million cycles (UL Verification ID: V875753) — well above standard commercial requirements. Backed by a 10-Year Limited Warranty and ANSI/BHMA Grade 1 certification, the ML2012 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
Keyed Function:
Single Cylinder
Standard Cylinder:
Conventional 6-pin, L4 Keyway, 0 Bitted Keying
Standard Strike:
ANSI straight lip standard, 4-7/8" x 1-1/4" x 1-1/8"
Warranty:
10 Year Limited
ANSI/BHMA:
F11
Product Subgroup:
Mortise Locks and Trim
Product Type:
Mortise Locks
Keyed:
Yes
Latch Throw:
3/4" Latchbolt, 1" Deadbolt
Commercial/Residential:
Commercial
Lock Type:
Mortise
Lock Function:
Cylinder x Thumbturn
Product Attribute:
Mortise Locks
Electronic:
No
Product Model:
ML2011
Collection:
ML2000_Series
Product Function:
Cylinder x Thumbturn
Door Hand Direction:
Field Reversible
Door Thickness Range:
1-3/4"
Product Substrate:
Brass or Bronze
Product Category:
Mechanical Locks
Department:
Door Hardware

Corbin Russwin ML2012-626 – Frequently Asked Questions

1) How does the Corbin Russwin ML2012 mortise lock work from each side of the door?
It's a Cylinder x Thumbturn function: key operation from the outside, thumbturn from the inside. That makes it suited to an opening where you want keyed control from the corridor or exterior but free, tool-free operation from within. It is a mechanical lock, not electronic.
2) Will the ML2012 mortise lock fit a 1-3/4 inch door with a 2-3/4 inch backset prep?
That's exactly the prep it's built for. Door thickness is 1-3/4 inches standard (optional thicknesses are available) and the backset is 2-3/4 inches, which is the normal commercial mortise backset. The lockcase measures 5-7/8 x 4 x 15/16 inches, so the mortise pocket has to accept that body.
3) Do I have to order the ML2012 mortise lock handed, or can it be reversed on site?
Handing is field reversible. The ML2000 Series uses a patented quick reversible latchbolt, so the hand is changed without pulling the lock case apart. Useful if you are stocking spares for a building with mixed left and right hand openings.
4) Can I use the ML2012 on a fire-rated opening?
Yes. It is UL/cUL listed and UL10C positive pressure rated, good for 3-hour fire doors up to 4 ft x 10 ft single or 8 ft x 10 ft pair. It also meets ADA A117.1 and carries California State Fire Marshal and windstorm/hurricane certification.
5) Will the ML2012 deadbolt latch into my existing ANSI strike?
The deadbolt is one-piece stainless steel with a 1 inch throw, and the latchbolt throws 3/4 inch, with a 9/16 inch auxiliary deadlocking latch. Supplied strike is an ANSI straight lip, 4-7/8 x 1-1/4 inches with 1-1/8 inch lip to center. If your frame already carries a standard 4-7/8 inch ANSI strike prep, the replacement strike drops into it.
6) What cylinder comes with the Corbin Russwin ML2012, and can I key it into my building's existing system?
Standard is a brass conventional 6-pin cylinder in the L4 keyway, shipped 0-bitted. It can be set up on new or existing Corbin Russwin key systems, and the lock will accept most other manufacturers' cylinders if your facility is standardized elsewhere. If you already have cylinders on hand, the Less Cylinder option is the one to order.
7) What is the closest equivalent to the Corbin Russwin ML2012 mortise deadlock from another manufacturer?
The nearest peer is the Sargent 4874 mortise deadbolt from the 4870 Series, which is a double cylinder function on a 2-3/4 inch backset - the same backset the ML2012 uses. The difference is at the inside face: the ML2012 is a cylinder x thumbturn function, so the interior operates by turn piece, while the 4874 is keyed on both sides. Choose by whether the inside of the opening should be key-operated or thumbturn-operated. Kaba Ilco's 185 Series mortise lock is also a deadbolt function and ships with no handing, whereas the ML2012 is handed with a field reversible quick reversible design.
8) I need a mortise lock with a lever and a latch, not just a deadbolt - what should I order instead of the ML2012?
The ML2012 is a deadlock: it throws a 1 inch stainless deadbolt and a 3/4 inch latchbolt but does not carry lever trim as its operating function. If the opening needs a latching lever set, the Accentra 8805FL is a Grade 1 storeroom mortise lock with an Arcadia lever from the 8800 Series, and the Cal-Royal NM8080 is a Grade 1 storeroom mortise lockset for 1-3/4 inch doors with an interchangeable core option. For an office or entrance function with an auxiliary deadlatch, the Cal-Royal NM8050 covers that on the same 1-3/4 inch door thickness as the ML2012.
9) We want keypad access instead of a key on the deadbolt - what replaces the ML2012?
For a keyless deadbolt, the Alarm Lock DL4500 Series is a Grade 1 electronic mortise deadbolt with 2,000 user codes and a privacy keypad, fitted to doors 1-5/8 to 1-7/8 inch thick. Note that the ML2012 is specified for 1-3/4 inch doors, which falls inside the DL4500 range, so a straight swap is plausible on a standard door. The ML2012 itself is a mechanical, non-electronic lock, so the Alarm Lock unit brings a power and code-management requirement the ML2012 does not have.
10) Will a Baldwin 6301 or 6310 mortise lock drop into the same prep as the Corbin Russwin ML2012?
They will not line up. The Baldwin 6301 entry/apartment and 6310 entry/storeroom mortise lock bodies are built on a 2-1/2 inch backset, while the ML2012 uses a 2-3/4 inch backset with an ANSI straight lip strike measuring 4-7/8 by 1-1/4 inches with 1-1/8 inch lip to center. Those are different door preps. The Baldwin bodies are also latching entrance functions with knob or lever operation rather than a keyed deadlock.
11) What do I need to specify when ordering the ML2012 mortise deadlock?
Four decisions. Cylinder: conventional standard cylinder or less cylinder. Finish: 626 satin chrome or 630 satin stainless steel. Keying: keyed different (standard) or keyed alike if you want one key across multiple locks. And there's a free-text field for special cylinder or keying requirements, which is where a master key system or a restricted keyway request goes.
12) Is the ML2012 heavy duty enough for a high-traffic school or hospital corridor?
It's ANSI/BHMA A156.13 Series 1000 Grade 1, operational and security, with a heavy-gauge steel case and a UL cycle verification at 14.5 million cycles (ID V875753). That's well past the minimum Grade 1 cycle requirement, which is why it shows up in schools, hospitals, government buildings and industrial facilities.
13) What is the difference between the Corbin Russwin ML2012 and a Sargent 4874 mortise deadbolt?
Both are mortise deadbolts on a 2-3/4 inch backset, but the operation differs. The ML2012 is Cylinder x Thumbturn: key outside, thumbturn inside. The Sargent 4874 from the 4870 Series is a double cylinder deadbolt, meaning key operation on both sides. Pick the thumbturn version where egress code or occupant convenience rules out a key on the inside.
14) Can the ML2012 lockbody do other functions, or do I have to order a different mortise lock for each opening?
Twelve functions are configurable from a single ML2054 lockbody in the ML2000 Series, so a locksmith stocking one body can cover a range of openings. The ML2012 itself is supplied as the Cylinder x Thumbturn deadlock. Trim is a separate decision, and the series runs from standard sectional and escutcheon designs through Museo, Vineyard, and Behavioral Health (BHSS/BLSS) trims, with status indicator options on sectional and escutcheon trim.
15) What are the center-to-center dimensions I need for the door prep on the ML2012?
Knob or lever to cylinder is 3-5/8 inches (92mm), and knob or lever to thumbturn is 2-7/16 inches (62mm). The armored front is 8 x 1-1/4 inches in wrought brass, bronze or stainless. Those are the numbers to check against an existing mortise pocket before you commit to a retrofit.
16) What else could I look at if I need an electrified or keypad mortise lock instead of a mechanical one?
The ML2012 is mechanical only. Within the Corbin Russwin range, motorized electric latch retraction (MELR) is offered on the ML20900 series. Across other brands, the BEST 45HW is a wired electromechanical mortise lock running 12V or 24V, and the Command Access ML190 Series is a motorized mortise lock with field-selectable fail-safe/fail-secure operation on 24VDC. For standalone keypad access, the Alarm Lock DL3500CR is a Grade 1 electronic mortise lock with 300 user codes.
17) My doors are thicker than 1-3/4 inches. Is there a mortise lock that covers a thickness range?
The ML2012 is set up for 1-3/4 inch doors as standard, with optional thicknesses available on request. If you need a lock listed across a range out of the box, the Hager 3800 Series covers 1-3/4 to 2-1/2 inches in passage (3810E, 3810S) and office (3850E) functions on a 2-3/4 inch backset. Note those are non-keyed functions, so they are not a substitute for a keyed deadlock.
18) Is a Sargent 130KB thumbturn a substitute for the ML2012?
No. The Sargent 130KB is a standard mortise thumbturn from the 8200 Series - a trim piece, not a lock body. The Sargent 130W is the same kind of part with a round backplate on the 7800 Series. The ML2012 is a complete Grade 1 mortise deadlock with a heavy-gauge steel lock case, a 1 inch stainless deadbolt and a 6-pin L4 keyway cylinder. A thumbturn on its own replaces only the interior turn piece of an existing mortise lock.
19) What mortise lock should I use for a classroom or intruder-function door rather than the ML2012 deadlock?
The ML2012 is a cylinder x thumbturn deadlock and does not provide classroom security functions. For classroom openings, the Cal-Royal NM8070 is a Grade 1 classroom mortise lockset for 1-3/4 inch doors, and the Marks USA LA318GJ is a Grade 1 classroom security indicator mortise lockset with an ANSI strike and steel escutcheon, also for 1-3/4 inch doors. If the requirement is an intruder function lock body, the BEST 45HCA heavy duty mortise lockbody covers that.
20) Is there a Grade 1 mortise option with a deadbolt plus lever trim as one unit instead of the ML2012 deadlock?
Yes. The Sargent 7925 is a Grade 1 heavy duty dormitory/corridor exit function mortise lock with rose trim and a single cylinder deadbolt, so you get lever operation and a deadbolt in one case. The Cal-Royal NM8440 is a Grade 1 privacy mortise lockset with deadbolt for 1-3/4 inch doors, which matches the ML2012 door thickness. The ML2012 remains the choice when the door needs deadbolt security only with no lever trim on the case.
21) Can I use a TownSteel MRX or Marks 5PDN in place of the ML2012 on a behavioral health door?
They serve different roles. The TownSteel MRX-L-01 and MRX-A-01 are Grade 1 heavy duty anti-ligature passage mortise locksets in stainless steel for 1-3/4 inch doors, and the Marks USA 5PDN is a Grade 1 ligature resistant, ADA compliant hospital passage push/pull paddleset in satin stainless. All three are passage function - no key control. The ML2012 is a keyed Grade 1 deadlock with a cylinder outside and thumbturn inside, so use it where the behavioral health opening must be locked rather than free-swinging; Corbin Russwin's ML2000 trim range includes behavioral health BHSS and BLSS designs.
22) What is the difference between the ML2012 and an electrified mortise lock like the Command Access ML190 or Schlage L9092EU?
The ML2012 is a purely mechanical Grade 1 mortise deadlock - no wiring, no power supply, keyed outside with a thumbturn inside. The Command Access ML190 Series is a motorized heavy-duty mortise lock with field selectable EL/EU operation running on 24VDC in a storeroom function, and the Schlage 03A electric lock/unlock outside lever mortise lock is a heavy duty corridor function on 12/24VDC with request-to-exit, for 1-3/4 inch doors. Choose an electrified body only if the opening is tied to an access control system; otherwise the ML2012 needs no power run.
23) Is the Marks USA 21AC or 22AC double cylinder mortise lock an alternative to the ML2012?
Only on a very different door. The Marks USA 21AC and 22AC are entrance double cylinder ornamental iron mortise locks with a round knob, specified for 1 inch door thickness - they are intended for narrow ornamental iron stiles. The ML2012 is built for 1-3/4 inch doors with a heavy-gauge steel case measuring 5-7/8 by 4 by 15/16 inches, which will not fit a 1 inch iron door.
24) We need a non-keyed mortise lock for a closet or hall - can the ML2012 be ordered that way?
The ML2012 is a keyed product; its outside is a cylinder and its inside a thumbturn, and it ships with a conventional 6-pin L4 keyway cylinder 0-bitted as standard. For non-keyed openings, look at the Schlage PM010 Grade 1 passage latch mortise lock for 1-3/4 inch doors, the Falcon MA101 Grade 1 heavy-duty mortise passage lock with field reversible operation, or the Hager 3810S Grade 1 passage mortise lock with rose on a 2-3/4 inch backset, which is the same backset the ML2012 uses.
25) I need a vandal resistant mortise lock for a public restroom or transit facility. Does the ML2000 Series cover that?
The ML2000VR vandal resistant option uses stainless steel escutcheons with tapered edges and Torx pin tamper-resistant screws. Pair it with Corbin Russwin's Pyramid or Access 3 high-security cylinders where key control and attack resistance both matter. For ligature-resistant behavioral health work, the series also offers BHSS and BLSS trim.
How fast can I get the Corbin Russwin ML2012-626 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 ML2012-626 come with a warranty?
Absolutely. The Corbin Russwin ML2012-626 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 ML2012-626?
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