Corbin Russwin ML20906 Grade 1...
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$2,023.81
$1,185.04
Corbin Russwin ML20906 Single Cylinder, Inside Grip Always Free, Mortise Electrified Lever Lockset, DS-Dirke Lever

Corbin Russwin ML20906 Grade 1 Single Cylinder, Inside Grip Always Free, Mortise Electrified Lever Lockset, DS-Dirke Lever

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Model: ML20906-DSA-626-RH-SAF
From the ML2000 Series Collection
$2,023.81
$1,185.04
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Corbin Russwin ML20906-DS Mortise Electrified Lever Lockset, Single Cylinder Inside Grip Always Free, Dirke Lever

Commercial-Grade Electrified Mortise Security for High-Traffic Applications

The Corbin Russwin ML20906-DS is a single-cylinder, inside-grip-always-free mortise electrified lever lockset from the ML2000 Series, featuring the Dirke (DS) lever design. Engineered to ANSI/BHMA A156.13 Series 1000 Operational and Security Grade 1 standards, this lockset is constructed of heavy-gauge steel and supports both Fail Safe (SAF) and Fail Secure (SEC) operating modes for versatile access control integration. It accommodates standard door thicknesses of 1-3/4" (with a range from 1-3/8" to 4") and a standard backset of 2-3/4" (minimum 2-3/8", maximum 2-3/4"), making it suitable for wood, hollow metal, and bullet-resistant doors. UL listed, UL10C compliant, and rated for fire doors up to and including 3-hour fire ratings, this lockset delivers the reliability and security demanded by commercial 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
  • Healthcare Institutions and Medical Facilities
  • Educational Facilities and Campus Buildings
  • Government and Municipal Buildings
  • Retail Establishments and Shopping Centers
  • Industrial and Warehouse Facilities
  • Multi-Tenant Residential and Mixed-Use Properties

Why Choose Corbin Russwin Quality?

Corbin Russwin ML2000 Series mortise locksets are built to ANSI/BHMA A156.13 Series 1000 Operational and Security Grade 1 standards using heavy-gauge steel construction, delivering performance that far exceeds minimum requirements for durability and longevity in demanding commercial environments. The ML20906-DS is UL listed, UL10C compliant, ADA compliant, ASTM E330 certified, Florida Building Code Windstorm Certified, and rated for fire doors up to and including 3-hour fire ratings, ensuring comprehensive code compliance across a wide range of applications. Backed by a ten-year mechanical warranty, five-year MELR warranty, and two-year electrical warranty, this lockset represents a trusted investment in long-term security and access control reliability.

Product Specs

Subcategory:
Mortise Locks
Product Group:
Mechanical Locks
Series:
ML2000 Series
Standard Latch:
3/4" Latchbolt
Standard Strike:
ANSI-Straight Lip,1-1/8" (29mm) Lip to Center
Product Subgroup:
Mortise Lockset
Product Type:
Mortise Locks
Commercial/Residential:
Commercial
Lock Type:
Mortise
Lock Function:
Fail Safe/Fail Secure
Product Model:
ML20906
Collection:
ML2000 Series
Product Function:
Fail Safe/Fail Secure
Door Hand Direction:
Field Reversible
Door Thickness Range:
1-3/4"
Product Substrate:
Steel
Product Category:
Mechanical Locks
Backset (Distance):
2-3/4"
Department:
Door Hardware

Corbin Russwin ML20906-DSA-626-RH-SAF – Frequently Asked Questions

1) What is the difference between the Fail Safe and Fail Secure versions of the Corbin Russwin ML20906?
Both are orderable on the ML20906. Fail Safe (SAF) unlocks the outside lever when power is removed, which is what you want on a stair or egress-side opening tied to a fire alarm release. Fail Secure (SEC) keeps the outside lever locked when power drops, which is the normal choice for a controlled entry where you do not want the door open on a power loss. The inside grip is always free either way, so egress is never electrically dependent.
2) Will the ML20906 mortise lock fit a 1-3/4 inch hollow metal door with a 2-3/4 inch backset prep?
That is exactly the standard prep for it. The ML20906 is built for 1-3/4 inch doors at a 2-3/4 inch backset, and it suits wood, hollow metal, and bullet-resistant doors. The lockcase is 5-7/8 x 4 x 15/16 inches and the armored front is 8 x 1-1/4 inches, so an existing ANSI mortise pocket in a commercial door takes it. Thicknesses from 1-3/8 up to 4 inches are available as options, and the backset can run as low as 2-3/8 inches.
3) Do I have to order the ML20906 handed, or can I flip it in the field?
You pick left-hand or right-hand when you order, but the latchbolt is Quick Reversible, so it can be re-handed without taking the lock case apart. Practically that means a wrong-handed lock on site is a five-minute fix rather than a return.
4) Can I use the ML20906 on a 90-minute or 3-hour rated fire door?
Yes. The ML20906 is UL and cUL listed to UL10C for positive pressure and carries a fire rating up to and including 3 hours, good for a single door to 4 ft x 10 ft or a pair to 8 ft x 10 ft. It also meets ADA A117.1, is accepted by the California State Fire Marshal, and is windstorm/hurricane certified per ASTM E330 and the Florida Building Code.
5) Will the ML20906 latch into the strike that is already in my frame?
Check the lip. It ships with an ANSI straight lip strike, 4-7/8 x 1-1/4 inches with 1-1/8 inch lip to center, and the two-piece anti-friction latchbolt throws 3/4 inch (19mm). The auxiliary latchbolt gives 9/16 inch effective throw and deadlocks the latch. If your frame already has a standard ANSI 4-7/8 mortise strike prep, it drops in; if your existing strike has a different lip-to-center, use the supplied strike so the latch and deadbolt line up.
6) Can I key the ML20906 into the master key system already running in my building?
Yes, in most cases. The lockset works with new or existing Corbin Russwin key systems and accepts most other manufacturers' cylinders. Standard supply is a brass 6-pin L4 keyway cylinder, 0-bitted. If your building runs an interchangeable core system, order the IC 6-pin less core version and drop your own cores in; if you are keying to a competitor's system, order less cylinder and supply your own.
7) What is the closest cross-brand equivalent to the Corbin Russwin ML20906 electrified mortise lockset?
The closest peer is the Schlage L9092EU with 03A lever trim, an electric lock/unlock outside lever mortise lock that is keyed outside, includes request-to-exit monitoring, runs on 12/24VDC, is heavy duty, and fits a 1-3/4 inch door. The ML20906 is also built for 1-3/4 inch doors, offers request-to-exit monitoring as an option, and is ordered as either Fail Safe or Fail Secure. Another close peer is the Command Access ML190 series motorized mortise lock, which is field selectable between EL and EU operation on 24VDC in a heavy-duty storeroom function.
8) I need electrified mortise access control but the opening has no power run to the door. What should I use instead of the ML20906?
The ML20906 is a wired electrified mortise lockset that operates in Fail Safe or Fail Secure mode, so it depends on power at the door. Where no wiring exists, standalone battery or keypad mortise locks cover the same opening: the Alarm Lock DL3500CR is a Grade 1 electronic mortise lock with 300 user codes in classroom function for 1-5/8 to 1-7/8 inch doors, the Schlage CO-100-MS-40-KP is a Grade 1 standalone keypad mortise lock in privacy function for 1-3/4 inch doors, and the BEST 45HZ EZ Series is an electronic keypad mortise lock with key override. The Dormakaba PowerPlex 2066 series is another mortise option in this family.
9) Which mortise locks look like substitutes for the ML20906 but will not work as one?
Several mortise-family items are not lock-for-lock replacements. The Schlage L0170 is half dummy trim, a Grade 1 non-keyed lever with dummy function that does not latch. The Emtek 3102 Memphis and 3104 Hamilton mortise entrance locksets are also dummy function. The Sargent 130KB and 130W are mortise thumbturns only, and the Sargent 4874 is a double cylinder mortise deadbolt with a 2-3/4 inch backset with no latch or lever. The Kaba Ilco 185 series is a deadbolt-function mortise lock. The ML20906 is a complete electrified lever lockset with a 3/4 inch latchbolt and an ANSI straight lip strike.
10) For a behavioral health or ligature-resistant opening, what should I specify instead of the ML20906?
For anti-ligature openings, the TownSteel MRX-L-01 is a Grade 1 heavy-duty stainless steel anti-ligature lever mortise lockset in passage function for 1-3/4 inch doors, and the MRX-A-01 is the ligature-resistant arch trim version in satin stainless, also Grade 1 heavy duty at 1-3/4 inch. 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 ML20906 is a lever lockset with the cast Dirke lever and is ordered in bright chrome or satin chrome.
11) My doors are 1-5/8 inch thick. Is the ML20906 the right electrified mortise lock?
The ML20906 is specified for 1-3/4 inch door thickness. For thinner doors in the 1-5/8 to 1-7/8 inch range, the Alarm Lock Trilogy line fits that band: the DL2700CR is a Grade 1 electronic mortise lock with classroom function and weatherproof design, the DL3500CR is a Grade 1 electronic mortise lock with 300 user codes in classroom function, and the DL4500DB is a Grade 1 electronic mortise deadbolt with 2,000 user codes and a privacy keypad.
12) Will the ML20906 work on an aluminum storefront or glass door?
The ML20906 is a mortise lockset specified for 1-3/4 inch doors with a 2-3/4 inch backset and a 5-7/8 inch by 4 inch by 15/16 inch lockcase. For narrow stile and glass openings, look instead to the Alarm Lock DL1300NW Trilogy Networx wireless electronic mortise lock made for Adams Rite deadlatches, the Kaba Ilco BR Series glass door bottom rail lock, or the Dormakaba E-Plex 2066, which is a wide stile electronic pushbutton keyless mortise lock.
13) Do I need the request-to-exit option on an electrified mortise lock?
Only if your access control panel needs to know the inside lever was used. The RX switch signals a legitimate egress so the system does not log it as a forced door or trip an alarm. Order RX yes when the opening is monitored by a panel or alarmed; skip it on a simple card-reader entry where nothing is watching the egress side. Either way the inside grip is always free mechanically, so RX is a monitoring feature, not an egress requirement.
14) How durable is the ML20906 for a high-traffic entry like a school or hospital corridor?
It is built to ANSI/BHMA A156.13 Series 1000, Operational and Security Grade 1, with a heavy-gauge steel lockcase, a one-piece stainless steel deadbolt with 1 inch throw, and a UL cycle verification of 14.5 million cycles (Verification ID V875753). That cycle count is well past the Grade 1 minimum, which is why it holds up on doors that get used hundreds of times a day.
15) Rose or escutcheon trim on a mortise lock, which should I order?
Rose trim (A) is the compact sectional option and shows only the lever and cylinder ring, which suits a clean modern opening. Escutcheon trim (M or N) is a full plate that covers the lever, cylinder, and any thumbturn as one unit, and it hides existing marks or oversized prep on a retrofit. Trim is thru-bolted either way for alignment and security. Escutcheon and sectional trims are also where the locked/unlocked status indicator option lives if you need visual status on the door. Spacing is fixed: 3-5/8 inches center to center lever to cylinder, 2-7/16 inches lever to thumbturn.
16) Is a standalone keypad or RFID mortise lock a substitute for the wired ML20906?
Not for a networked access control job. Standalone locks such as the Schlage CO-100 keypad mortise lock, the TownSteel FME-2000 Grade 1 RFID mortise lockset, or the Dormakaba E-Plex 2066 pushbutton keyless mortise lock carry credentials in the lock itself and need no wiring to a panel. The ML20906 is a wired fail safe/fail secure lock that a panel controls in real time, so it is what you use when the door has to unlock on a fire alarm release, on a remote release, or report egress back to the head end.
17) Can one ML2000 lock body cover several door functions so I can standardize across a facility?
That is the point of the platform. Twelve functions are configurable from a single ML2054 lockbody, so a facility can stock one body and set it to what each opening needs rather than carrying a dozen part numbers. Trim is a separate decision, and the series runs a wide range including Museo, Vineyard, and the Behavioral Health BHSS/BLSS trims for patient-room and ligature-resistant openings.
18) Can I use a BEST 45HW instead of the ML20906 for a wired electrified mortise opening?
The BEST 45HW is a wired electromechanical mortise lock with 12V/24V operation in the 45HW Wired Mortise Series, heavy duty, so it addresses the same wired electrified application. Choose between them on the trim and keying you are standardizing to: the ML20906 is ordered with the cast Dirke lever, rose or M and N escutcheon trim, bright or satin chrome finish, left or right handing, and keying as C 6-pin L4 keyway, IC 6-pin less core, or less cylinder.
19) Is there a simpler mechanical mortise lock I can use if the opening does not need electrified control?
Yes. If the door only needs a keyed mechanical function, the Accentra 8805FL is a Grade 1 storeroom mortise lock in the 8800 series, the Cal-Royal NM8080 is a Grade 1 storeroom mortise lockset with an interchangeable core option for 1-3/4 inch doors, and the Cal-Royal NM8050 is the Grade 1 office/entrance version with an auxiliary deadlatch. The Sargent 7925 covers corridor/dormitory function as a Grade 1 heavy-duty mortise lock with rose trim and a single cylinder deadbolt. The ML20906 differs in that it is ordered as Fail Safe or Fail Secure with optional request-to-exit monitoring for access control integration.
20) What is the difference between the ML20906 and a credential-reading electronic mortise lock like the Schlage LEMD or TownSteel FME-2000?
The ML20906 is a wired electrified mortise lockset whose outside lever is controlled by the access control system in Fail Safe or Fail Secure mode, with request-to-exit monitoring available and keying options including a 6-pin L4 keyway cylinder, IC 6-pin less core, or less cylinder. Credential-reading locks carry the reader on the lock itself: the Schlage LEMD-GRW is a Grade 1 ENGAGE wireless mortise lock with a 125kHz proximity reader and mobile-enabled deadbolt with LED, 3-hour fire rated; the TownSteel FME-2000 is a Grade 1 heavy-duty classroom mortise lockset with RFID for 1-3/4 inch doors; the Dormakaba Saffire LX-I-M002 is an RFID mortise lockset with BLE mobile access at BHMA Grade 2.
21) The ML20906 uses a 2-3/4 inch backset. What mortise lock bodies use a shorter backset?
The Baldwin mortise lock bodies are built on a 2-1/2 inch backset: the 6301 entry/apartment knob by knob and 6301LS lever by lever for 1-3/4 inch and over doors, and the 6310 entry/storeroom knob by knob and 6310190RRLS right hand reverse lever version for 1-3/8 inch and over doors. The ML20906 is specified at a 2-3/4 inch backset with an ANSI straight lip strike at 1-1/8 inch lip to center, so a shorter-backset body will not drop into the same mortise prep.
22) What non-keyed mortise locks pair with the ML20906 on openings that do not need access control?
For the passage and privacy doors in the same building, the Hager 3800 series covers non-keyed mortise functions at 2-3/4 inch backset: the 3810E Grade 1 passage with escutcheon and the 3810S passage with rose for 1-3/4 to 2-1/2 inch doors, the 3840S Grade 1 privacy for 1-3/4 to 2 inch doors, and the 3850E Grade 1 office lever with escutcheon, non-keyed. 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 that is field reversible and fire rated. The ML20906 is field reversible as well and is ordered with rose or escutcheon trim.
23) For a classroom intruder-function requirement, is the ML20906 the right choice or is there a better fit?
The ML20906 is ordered in Fail Safe or Fail Secure electrified function, not a classroom intruder function. For classroom security, the Cal-Royal NM8070 is a Grade 1 classroom mortise lockset with auxiliary deadlatch for 1-3/4 inch doors, the Marks USA LA318GJ is a Grade 1 classroom security indicator mortise lockset with an ANSI strike and a steel escutcheon 8-1/2 inch H x 2-3/4 inch W x 7/16 inch, and the TownSteel FME-4000 is an electronic intruder classroom mortise lockset with RFID, Grade 1 heavy duty at 1-3/4 inch. The BEST 45HCAINL is a heavy-duty mortise lockbody with intruder function.
24) Does the ML20906 have a deadbolt, and does it interfere with getting out of the room?
There is a one-piece stainless steel deadbolt measuring 19/32 x 1-1/4 inches with a 1 inch throw, plus the deadlocking auxiliary latch. The inside grip stays always free, so a single motion on the inside lever retracts the latch for egress regardless of the electrical state of the lock.
25) Is the ML20906 available in an oil-rubbed bronze or brass finish to match my other doors?
The ML20906 with the Dirke lever comes in two finishes, 625 bright chrome and 626 satin chrome. 626 satin chrome is the common commercial choice and reads as a match to satin stainless trim on adjacent openings. If your building is standardized on a bronze or brass finish, the Dirke configuration will not match it.
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Does the Corbin Russwin ML20906-DSA-626-RH-SAF come with a warranty?
Absolutely. The Corbin Russwin ML20906-DSA-626-RH-SAF is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
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