Corbin Russwin ML2072 Grade 1 ...
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$676.75
$402.08
Corbin Russwin Corbin Russwin ML2072 Classroom Intruder - Mortise Lockbody Only COR-ML2072-LL

Corbin Russwin ML2072 Grade 1 Classroom Intruder - Mortise Lockbody Only

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Model: COR-ML2072-LL-626
From the ML2000_Series Collection
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$676.75
$402.08
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Corbin Russwin ML2072-LL Classroom Intruder Mortise Lockbody, Grade 1, Field Reversible, 1-3/4" Door

Commercial-Grade Classroom Intruder Mortise Lock for High-Traffic Institutional Applications

The Corbin Russwin ML2072-LL is a Grade 1 Classroom Intruder Mortise Lockbody from the ML2000 Series, engineered for demanding commercial, institutional, industrial, and government environments. Constructed of heavy-gauge steel with a 1" stainless steel deadbolt and patented Quick Reversible latchbolt, this lockbody is designed for 1-3/4" (44mm) standard door thickness and is field reversible for flexible installation. The ANSI straight lip strike measures 4-7/8" (124mm) x 1-1/4" (32mm) x 1-1/8" (29mm) lip to center, and the unit has been UL cycle tested to an exceptional 14.5 million cycles (Verification ID: V875753), making it an ideal choice for offices, schools, hospitals, hotels, and other high-use applications.

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

  • K-12 Schools and Educational Facilities
  • College and University Campus Buildings
  • Healthcare Institutions and Hospitals
  • Commercial Office Buildings
  • Government and Municipal Buildings
  • Hotels and Hospitality Properties
  • Industrial and Institutional Facilities

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 manipulation. When paired with Corbin Russwin patented high-security Pyramid or Access 3® cylinders, any door can be transformed into a robust barrier against intruders.

Why Choose Corbin Russwin Quality?

Corbin Russwin ML2000 Series mortise locks deliver professional-grade reliability through heavy-gauge steel construction with a 1" stainless steel deadbolt, UL cycle tested to an outstanding 14.5 million cycles (Verification ID: V875753) — well above and beyond standard requirements. Backed by a 10 Year Limited warranty and featuring the patented Quick Reversible latchbolt, the ML2072-LL provides life safety and security in a single door prep, eliminating the need for a separate deadlock. Engineered for the most demanding commercial, institutional, and government applications where dependable performance and classroom security are essential.

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:
Classroom Intruder
Product Attribute:
Mortise Locks
Electronic:
No
Product Model:
ML2072
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-ML2072-LL-626 – Frequently Asked Questions

1) What exactly comes with the Corbin Russwin ML2072 classroom intruder mortise lock, just the lock body?
The ML2072-LL is sold as a mortise lockbody only. No levers, roses, escutcheons, or cylinder are included, so you order trim and a cylinder separately. The ML2000 Series trim range covers sectional and escutcheon designs including Museo, Vineyard, and Behavioral Health (BHSS/BLSS), with status indicator options on sectional and escutcheon trim. Standard cylinder spec for the series is a brass 6-pin L4 keyway, 0-bitted.
2) What does the ML2072 classroom intruder function actually do at the door?
Classroom intruder means the door can be locked or unlocked from inside the room without the teacher stepping into the corridor. The ML2072 carries a 1 inch throw stainless steel deadbolt alongside the 3/4 inch latchbolt, so life safety and security live in one door prep and you do not need a separate deadlock above the lock. Spacing from lever to thumbturn is 2-7/16 inches, and lever to cylinder is 3-5/8 inches.
3) Will a Corbin Russwin ML2072 mortise lock fit a 1-3/4 inch door?
Yes, 1-3/4 inch (44mm) is the standard door thickness for the ML2072, with optional thicknesses available in the series. The lockcase measures 5-7/8 x 4 x 15/16 inches and works to a 2-3/4 inch backset, so your mortise pocket and cross bore need to be prepped to standard ANSI mortise dimensions.
4) Do I have to order the ML2072 mortise lock handed, or can I reverse it in the field?
No need to order by hand. The lock is field reversible, and the patented Quick Reversible latchbolt lets you change handing without opening the lock case. That makes it simple for a property manager stocking one spare lockbody for both left and right hand openings across a building.
5) Will the ML2072 latch into the strike already in my frame?
The standard strike is an ANSI straight lip, 4-7/8 x 1-1/4 inches with 1-1/8 inch lip to center. With a 3/4 inch latchbolt throw and a 1 inch deadbolt throw, the existing strike has to have both a latch opening and a deadbolt pocket. If your frame carries only a latch strike from a non-deadbolt function, you will need to swap to a strike prepped for the deadbolt.
6) Is this Corbin Russwin mortise lock approved for a fire rated classroom door?
It is UL and cUL listed, UL10C positive pressure, rated for 3-hour fire doors up to 4 x 10 feet single or 8 x 10 feet pair. It also meets ANSI/BHMA A156.13 Series 1000 Grade 1 for both operational and security, ADA A117.1, California State Fire Marshal, and windstorm/hurricane certification.
7) Can I key a Corbin Russwin ML2072 into the master key system already running in my building?
It can be used with new or existing Corbin Russwin key systems, and the lock accepts most other manufacturers' cylinders, so a facility running a different brand's keyway can usually stay on its existing system. Standard series cylinder is brass, 6-pin L4 keyway, shipped 0-bitted for the locksmith to key. Cylinder is not included with the lockbody.
8) What is the closest cross-brand equivalent to the Corbin Russwin ML2072 mortise lock body?
The Accentra 8800FL Series mortise lock body is the closest peer. Both are ANSI/BHMA Grade 1 mortise lock bodies, and both are field reversible for handing, so either can be set to the hand of the opening without swapping the case. The ML2072 is the ML2000 Series body configured for the Classroom Intruder function, with a 3/4 inch latchbolt and an ANSI straight lip strike, 4-7/8 inch x 1-1/4 inch x 1-1/8 inch lip to center. Confirm the Accentra body is ordered in the matching function before substituting, and remember that the trim, cylinder and keying are specified separately on a lock body order.
9) Will an Accentra 8800FL mortise lock body drop into a door already prepped for a Corbin Russwin ML2072?
Treat it as a same-category swap, not a guaranteed drop-in. Both are Grade 1 mortise lock bodies with field reversible handing, but mortise case dimensions, hub spacing and cylinder-to-hub centers vary between manufacturers, and the ML2072 runs a 5-7/8 inch x 4 inch x 15/16 inch case with 3-5/8 inch knob or lever to cylinder centers and a 2-3/4 inch backset. Measure the existing pocket and trim hole pattern before ordering across brands. If the goal is to keep the existing Corbin Russwin trim and key system in place, staying with the ML2000 Series body is the lower-risk path.
10) Is a mortise lock like the ML2072 the right choice for a school corridor, or should I use a cylindrical lock?
A mortise lock is the choice when the door has a mortise pocket already or when you need a deadbolt and latch in one prep, which is the case here with the 1 inch deadbolt plus 3/4 inch latchbolt. It also takes the abuse of institutional traffic, UL cycle tested to 14.5 million cycles. A cylindrical lock is the simpler retrofit on a door bored 2-1/8 inches through the face, but it cannot give you a classroom intruder deadbolt from the same prep.
11) What is the other Grade 1 field reversible mortise lock body option besides Corbin Russwin?
The Accentra 8800FL Series mortise lock body is the cross-brand equivalent we carry, also Grade 1 with field reversible handing. Both are lock bodies only. Pick the Corbin Russwin ML2072 if the building is already standardized on Corbin Russwin trim and keying, since the ML2072 works with existing Corbin Russwin key systems.
12) Does the ML2072 mortise lock need power or wiring?
No. The ML2072-LL is a fully mechanical lockbody with no electrical components, so nothing has to be wired and the classroom function works if power drops. If you need electric latch retraction, that is a motorized option (MELR) on the ML20900 series rather than this mechanical body.
13) I need an electrified mortise lock for an access control opening. Is the ML2072 the right choice?
No. The ML2072 is a mechanical mortise lock body with no electrical operation, so it will not tie into an access control system on its own. For a mechanical Grade 1 opening it is a direct fit, and the Accentra 8800FL Series Grade 1 mortise lock body is a comparable mechanical option. For card reader or remote release control, specify an electrified mortise body such as an ML20900 series unit with motorized electric latch retraction rather than the mechanical ML2072.
14) What should I order instead if I need a complete mortise lockset rather than just the body?
The ML2072 ships as a mortise lock body only, so levers or knobs, escutcheon or sectional trim, and the cylinder are ordered separately. The Accentra 8800FL Series comparable is also sold as a lock body only. If the job needs a single ready-to-install assembly, specify a complete ML2000 Series lockset with the trim design and finish called out, rather than a body-only line item. Body-only ordering is the right path when you are replacing a failed case behind trim that is staying on the door.
15) Is a Grade 2 mortise or cylindrical classroom lock an acceptable substitute for the ML2072 on a school corridor door?
Not where the spec calls Grade 1. The ML2072 is ANSI/BHMA A156.13 Series 1000 Operational and Security Grade 1 and is UL10C listed for 3-hour positive pressure fire doors, and the Accentra 8800FL Series mortise body is likewise a Grade 1 mortise lock body. A Grade 2 or cylindrical lock is a different door prep and a different test standard, so it is a substitute only if the drawing and the local fire and life safety requirements allow it. On rated corridor and classroom openings in K-12 and campus buildings, stay with a Grade 1 mortise body.
16) Does the finish choice on the ML2072 lockbody matter if it is hidden in the door?
The visible parts are the armored front and the strike, which is why 14 finishes are offered: 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. Match it to the trim you are ordering. The armored front is wrought brass, bronze, or stainless, 8 x 1-1/4 inches.
17) Does the ML2072 latch hold a door closed if the frame is slightly out of alignment?
The two-piece mechanical latchbolt has an anti-friction insert, which cuts the force needed to close the door, useful on doors with closers or a bit of positive pressure. A 9/16 inch effective throw auxiliary latchbolt deadlocks the main latch against being carded. Latchbolt is 5/8 x 1 inch with a 3/4 inch throw.
18) We get heavy abuse on our dorm and school doors. Is there a tougher trim option for the ML2000 mortise locks?
Yes, the ML2000VR vandal resistant option uses stainless steel escutcheons with tapered edges and Torx pin tamper-resistant screws. Trim across the series is thru-bolted for alignment and added security, and pairing it with Corbin Russwin Pyramid or Access 3 high-security cylinders adds key control. The lockbody itself is heavy-gauge steel, cycle tested to 14.5 million.
19) Our facility is standardizing on one mortise lock body across all doors. Does the ML2072 cover functions other than classroom intruder?
The ML2072 itself is built for the Classroom Intruder function, which locks and unlocks the outside lever by key from either side and provides a 1 inch stainless steel deadbolt so life safety and security are handled in one door prep. Within the ML2000 Series, 12 functions are configurable from one ML2054 lockbody, which is the usual route for a facility that wants a single body stocked across mixed openings. The Accentra 8800FL Series Grade 1 body is an alternative standard if the facility is keyed to that brand instead. Standardizing on one brand also keeps trim and cylinder ordering consistent.
How fast can I get the Corbin Russwin COR-ML2072-LL-626 delivered?
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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 COR-ML2072-LL-626 come with a warranty?
Absolutely. The Corbin Russwin COR-ML2072-LL-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 COR-ML2072-LL-626?
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
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