Corbin Russwin ML20915 Grade 1...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$1,042.47
$755.45
Corbin Russwin ML20915 Fail Secure Electrified Mortise Lock, Both Grips Locked when Not Energized, No Cylinder Override, Lever x Lever Body Only

Corbin Russwin ML20915 Grade 1 Fail Secure Electrified Mortise Lock, Both Grips Locked when Not Energized, No Cylinder Override, Lever x Lever Body Only

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Model: ML20915-LL-626-SEC
From the ML2000_Series Collection
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$1,042.47
$755.45
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Corbin Russwin ML20915-LL ML2000 Series Fail Secure Electrified Mortise Lock Body, Both Grips Locked When Not Energized, Lever x Lever

Grade 1 Electrified Mortise Lock Body for High-Traffic Commercial Applications

The Corbin Russwin ML20915-LL is a Grade 1 electrified fail secure mortise lock body from the ML2000 Series, engineered for demanding commercial, institutional, industrial, and government environments. In fail secure operation, both grips are locked when the lock is not energized, and the latchbolt is operable by grip from either side only when the lock is energized; the latchbolt remains operable by key outside when not energized. Constructed of heavy-gauge steel with a 1" stainless steel deadbolt and patented Quick Reversible latchbolt, this lock body is designed for 1-3/4" (44mm) standard door thickness with field-reversible handing. The auxiliary latch deadlocks the latchbolt for added security, and the unit draws 500mA Peak and 15mA Holding current.

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 Mixed-Use Properties

Tamper-Resistant Design

The ML2000VR (Vandal Resistant) Series variant features vandal-resistant stainless steel escutcheons with tapered edges and Torx® pin tamper-resistant screws, providing a formidable barrier against abuse and unauthorized manipulation. When paired with Corbin Russwin patented high-security Pyramid or Access 3® cylinders, the ML2000 Series delivers a comprehensive intrusion-deterrent solution for high-risk openings.

Why Choose Corbin Russwin Quality?

Corbin Russwin ML2000 Series mortise lock bodies deliver professional-grade reliability backed by UL Cycle testing completed at 14.5 Million Cycles (Verification ID: V875753), far exceeding standard durability benchmarks for high-traffic commercial applications. Heavy-gauge steel construction with a 1" stainless steel deadbolt and patented Quick Reversible latchbolt ensures consistent performance across offices, schools, hospitals, and government facilities. The 10 Year Limited warranty underscores Corbin Russwin's commitment to long-term quality and dependability in demanding commercial environments.

Manufacturer Resources

Key Systems Catalog

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
Product Subgroup:
Mortise Lock Bodies
Product Type:
Mortise Lockbody Only
Commercial/Residential:
Commercial
Function Description:
Mortise Lockbody Only
Lock Type:
Mortise
Lock Function:
Fail Secure
Product Attribute:
Mortise Locks
Electronic:
No
AMP Draw:
500mA Peak, 15mA Holding
Product Model:
ML20915
Collection:
ML2000_Series
Product Function:
Fail Secure
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 ML20915-LL-626-SEC – Frequently Asked Questions

1) What happens to the Corbin Russwin ML20915 when the power goes out?
It locks. The ML20915 is a fail secure electrified mortise lock: with no power, both the inside and outside grips are locked and the latchbolt can only be retracted by key from the outside. Energize it and the latchbolt becomes operable by grip from either side. If your opening needs free egress on power loss, a fail secure function is the wrong choice for that door.
2) Does the ML20915 mortise lock come with levers, trim and a cylinder?
No. The ML20915-LL is a lock body only, so the lever trim and the cylinder are ordered separately. The case is prepped for a 6-pin L4 keyway cylinder as the standard, and Corbin Russwin states it works with new or existing Corbin Russwin key systems and accepts most other manufacturers' cylinders. Note this particular function has no cylinder override of the electrical control on the inside grip side.
3) What door thickness and backset does the ML20915 need?
Standard build is for a 1-3/4 inch (44mm) door with a 2-3/4 inch (70mm) backset, which is the normal commercial mortise prep. Optional door thicknesses are available from Corbin Russwin. The lock case itself measures 5-7/8 x 4 x 15/16 inches, so your mortise pocket has to accept that.
4) Do I have to order the ML20915 handed, or can I reverse it in the field?
Handing is field reversible. The patented Quick Reversible latchbolt lets you re-hand the lock without opening the lock case, so one body covers left and right hand openings.
5) What power supply do I need for the ML20915, and what current does it draw?
Size the supply for 500mA peak inrush with a 15mA holding current per lock. On a multi-door job, multiply the holding current across all locks and make sure the supply can still cover the peak draw when several energize at once.
6) Will the ML20915 latch into my existing ANSI mortise strike?
Most likely yes on a standard commercial frame. The latchbolt is a two-piece anti-friction design with a 3/4 inch (19mm) throw, and the standard strike is an ANSI straight lip at 4-7/8 x 1-1/4 inches with a 1-1/8 inch lip-to-center. If your frame already carries an ANSI strike of those dimensions, the existing strike works; there is also a 9/16 inch deadlocking auxiliary latch riding above the latchbolt, so the strike lip has to clear it.
7) Can the ML20915 go on a fire rated door?
Yes. The ML2000 Series is UL/cUL listed to UL10C positive pressure and carries a 3-hour fire door rating up to 4 ft x 10 ft single or 8 ft x 10 ft pair. It also meets ANSI/BHMA A156.13 Series 1000 Grade 1 for both operational and security grade, and ADA A117.1, plus California State Fire Marshal and windstorm/hurricane certification.
8) Is there a Grade 1 mortise lock body from another manufacturer that can replace the Corbin Russwin ML20915 on a non-electrified opening?
The Accentra 8800FL Series mortise lock body is a Grade 1 mortise lock body with field reversible handing, so it covers a mortise pocket where the opening does not need electrification. The difference is electrical: the ML20915 is an electrified fail secure body that draws 500mA peak and 15mA holding, with both grips locked when it is not energized. The 8800FL body is a mechanical lock body, so if the door is being tied to an access control system you need the ML20915; if the opening is standalone key and lever operation, the 8800FL body is the simpler route.
9) What is the Request to Exit option on the ML20915 and do I need it?
RX is an ordering choice on this lock body: you can take it with or without Request to Exit monitoring. Specify RX when your access control panel needs a signal that the inside lever was turned, so the door opening gets shunted instead of reported as a forced entry. If the door is not alarmed or monitored, the non-RX body is enough. Both options are available in every finish offered.
10) Is the ML20915 durable enough for a high traffic entrance?
It is built for it. The case is heavy-gauge steel with a one-piece stainless deadbolt throwing 1 inch, and UL cycle testing on the ML2000 Series was carried out to 14.5 million cycles (Verification ID V875753), well past the Grade 1 minimum. Typical use is commercial, institutional and government openings such as schools, hospitals and office buildings.
11) What is another Grade 1 mortise lock body option if the Corbin Russwin ML20915 is not right for my door?
The Accentra 8800FL Series Grade 1 mortise lock body is the other field-reversible Grade 1 body we carry. Keep in mind the ML20915 is specifically an electrified fail secure body for access-controlled openings; if your door needs a straight mechanical function with no wiring, you want a standard ML2000 mechanical body rather than the 915 function.
12) How much room do I need between the lever and the cylinder when cutting trim or ordering escutcheons for the ML2000?
Center to center from the knob or lever to the cylinder is 3-5/8 inches (92mm), and 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. Use those spacings when matching sectional or escutcheon trim to the door prep.
13) Does the Accentra 8800FL mortise lock body give the same ANSI grade as the Corbin Russwin ML20915?
Yes on grade. Both the Corbin Russwin ML20915 and the Accentra 8800FL Series mortise lock body are Grade 1, so either one meets a Grade 1 mortise call-out on a hardware schedule. Where they separate is function: the ML20915 is an electrified fail secure body with no cylinder override, locking both grips when power is off, while the 8800FL is specified as a mortise lock body with field reversible handing. If the spec line also calls for fail secure electrification, grade alone will not make the 8800FL a match.
14) We stock Accentra 8800FL bodies for re-handing in the field. Does the Corbin Russwin ML20915 re-hand the same way?
Both are field reversible. The Accentra 8800FL Series mortise lock body is listed with field reversible handing, and the Corbin Russwin ML20915 uses a patented Quick Reversible latchbolt that re-hands without disassembling the lock case, with handing listed as field reversible. So a crew used to flipping the 8800FL in the field will not need a different practice on the ML20915 body. The ML20915 adds the electrified fail secure function the 8800FL description does not cover.
15) The opening needs a key override from the outside when power is down. Is the Accentra 8800FL body the right substitute for the ML20915?
For a purely mechanical opening, yes, the Accentra 8800FL Series mortise lock body is a Grade 1 mortise body that operates without power. Be clear on what the ML20915 does before you swap: it is fail secure with both grips locked when not energized and no cylinder override on the electrified function, though the latchbolt remains operable by key outside when not energized. If the requirement is straightforward mechanical key and lever control with no access control tie-in, the 8800FL body covers it; if the door must lock down on power loss under a card reader, stay with the ML20915.
16) Which finishes does the Corbin Russwin ML20915 lock body come in?
Fourteen finishes, so it can be matched to existing hardware in a building: 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. 626 and 630 are the usual commercial picks.
How fast can I get the Corbin Russwin ML20915-LL-626-SEC 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 ML20915-LL-626-SEC come with a warranty?
Absolutely. The Corbin Russwin ML20915-LL-626-SEC 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 ML20915-LL-626-SEC?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
Why buy the Corbin Russwin ML20915-LL-626-SEC from ZenSupply?
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