Corbin Russwin ML2052 Grade 1 ...
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Corbin Russwin Corbin Russwin ML2052 Mortise Classroom Intruder Lever Lockset COR-ML2052-KEYED

Corbin Russwin ML2052 Grade 1 Mortise Classroom Intruder Lever Lockset

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Model: COR-ML2052-NSA-626
From the ML2000_Series Collection
$1,591.00
$1,013.04
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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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Corbin Russwin ML2052-KEYED Mortise Classroom Intruder Lever Lockset Grade 1, ANSI F32, Field Reversible

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

The Corbin Russwin ML2052-KEYED is a Grade 1 mortise classroom intruder lever lockset from the ML2000 Series, engineered for demanding commercial, institutional, industrial, and government environments. Compliant with ANSI function F32, this lockset allows latchbolt operation by grip from either side unless the outside grip is locked by key from either side, 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, the ML2052 is designed for 1-3/4" (44mm) standard door thickness and features a field-reversible handing for flexible installation. The ML2000 Series has achieved an exceptional UL Cycle test result of 14.5 Million Cycles (Verification ID: V875753), underscoring its long-term reliability in the most demanding 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
  • Industrial and Warehouse Facilities
  • Hotels and Multi-Tenant Residential 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-risk 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 with heavy-gauge steel construction and a 1" stainless steel deadbolt, rated for an exceptional 14.5 Million Cycles in UL Cycle testing (Verification ID: V875753). Backed by a 10 Year Limited warranty and compliant with Grade 1 ANSI/BHMA standards, the ML2052 is engineered for demanding commercial applications where dependable classroom security and long-term performance 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:
F32
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 either side. Latchbolt by key when outside grip locked. Auxiliary latch deadlocks latchbolt.
Lock Type:
Mortise
Handle Type:
Lever
Lock Function:
Classroom Intruder
Product Attribute:
Mortise Locks
Electronic:
No
Product Model:
ML2052
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-ML2052-NSA-626 – Frequently Asked Questions

1) What does the Corbin Russwin ML2052 classroom intruder function actually do at the door?
The ML2052 is ANSI F32. The latchbolt works by grip from either side unless the outside grip is locked by key from either side, and once the outside grip is locked the latchbolt still retracts by key. The point of the intruder function is the inside key cylinder: a teacher locks the classroom door from inside the room without stepping into the corridor. Inside grip stays free for egress at all times, and the auxiliary latch deadlocks the latchbolt against carding.
2) Will the ML2052 mortise lock fit my existing door prep and 2-3/4 inch backset?
Backset is 2-3/4 inches (70mm), which is the standard commercial mortise backset, and the lockcase measures 5-7/8 x 4 x 15/16 inches with an 8 x 1-1/4 inch armored front. Door thickness is 1-3/4 inches standard. Center to center from lever to cylinder is 3-5/8 inches and lever to thumbturn is 2-7/16 inches, so if your existing pocket and face prep match those spacings the ML2052 drops into it.
3) Do I have to order the ML2052 handed, or can I re-hand it on site?
Order it without worrying about hand. The ML2052 lockbody is field reversible, and the patented Quick Reversible latchbolt lets you flip handing without opening the lock case. Note the lever selection is a separate matter: the Dirke (DS) lever is offered as a specific left hand or right hand part, so that one you do specify by hand.
4) Can I put the ML2052 on a fire rated classroom door?
Yes. The ML2000 Series is UL and cUL listed to UL10C positive pressure, good for a 3 hour fire door up to 4 x 10 feet single or 8 x 10 feet pair. It also meets ADA A117.1, carries California State Fire Marshal listing, and is windstorm/hurricane certified, which is what gets it past an inspector on a school corridor or a storm shelter opening.
5) Will the ML2052 latch into the strike that is already in my frame?
It ships with an ANSI straight lip strike, 4-7/8 x 1-1/4 inches with 1-1/8 inch lip to center. The latchbolt throws 3/4 inch (19mm) and the auxiliary latch has a 9/16 inch effective throw, so any correctly prepped ANSI 4-7/8 strike will take it. The 1 inch stainless deadbolt needs the deadbolt pocket behind that strike, so if the frame currently holds a latch-only lock the strike cutout will need the deadbolt hole added.
6) Can the ML2052 be keyed into my building's existing Corbin Russwin master key system?
Yes. The standard cylinder is a conventional brass 6-pin in the L4 keyway, shipped 0-bitted so a locksmith can pin it to your existing system. The lock also accepts most other manufacturers' cylinders, so if the campus runs a different keyway you can order it LC (less cylinder) and fit your own. Large format interchangeable core sites can order CL6 or CL7 to take a 6-pin or 7-pin LFIC core. Keyed different is standard; keyed alike is available when a set of doors needs to run on one key.
7) Will an ML2052 work on a 1-3/8 inch door?
Not as standard. The ML2052 is built for 1-3/4 inch (44mm) doors, which is the usual commercial thickness; optional thicknesses are available from the series but 1-3/4 is what ships. If your openings are the older 1-3/8 inch interior type, or thicker than standard, that has to be specified rather than assumed. For thicker doors, Hager's 3800 Series Grade 1 mortise locks are rated 1-3/4 to 2-1/2 inches on a 2-3/4 inch backset.
8) What is the closest equivalent to a Corbin Russwin ML2052 classroom intruder mortise lock from another manufacturer?
The Corbin Russwin ML2052 is a Grade 1 mortise lock with a Classroom Intruder function, keyed on both sides so the outside grip can be locked by key from either side. The closest mechanical peer is the BEST 45HCA series heavy duty mortise lockbody, which is offered with an Intruder function, and the Cal-Royal NM8070, a heavy duty 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 for 1-3/4 inch doors, adding a visual indicator to the classroom security arrangement.
9) What should I use instead of the ML2052 if the classroom door needs credential or code access rather than a key?
The Corbin Russwin ML2052 is a mechanical, non-electronic lockset. For openings that need code or credential entry, the TownSteel FME-4000 is an electronic intruder classroom mortise lockset with RFID for 1-3/4 inch doors, and the TownSteel FME-2000 is a Grade 1 classroom mortise lockset with RFID, also for 1-3/4 inch doors. The Alarm Lock DL3500CR is a Grade 1 Trilogy electronic mortise lock with classroom function and 300 user codes, and the DL2700CR is a Grade 1 Trilogy T2 electronic mortise lock with classroom function and weatherproof design; both fit doors 1-5/8 inch to 1-7/8 inch, a different thickness range than the 1-3/4 inch the ML2052 is built for.
10) What mortise lock should I specify instead when the door needs to stay locked to the outside at all times rather than be lockable by a teacher?
The Corbin Russwin ML2052 has a Classroom Intruder function where the latchbolt works by grip from either side unless the outside grip is locked by key. A storeroom function keeps the outside lever fixed instead: the Accentra 8805FL is a Grade 1 storeroom mortise lock with the Arcadia lever in the 8800 Series, and the Cal-Royal NM8080 is a heavy duty Grade 1 storeroom mortise lockset for 1-3/4 inch doors with an interchangeable core option. The Command Access ML190 is a heavy-duty motorized storeroom-function mortise lock with field selectable EL and EU operation on 24VDC.
11) Will a Schlage L0170 or an Emtek mortise entrance set work in place of an ML2052?
No. The Corbin Russwin ML2052 is a keyed Grade 1 mortise lockset with a working latchbolt and a 1 inch stainless steel deadbolt. The Schlage L0170 is a half dummy trim, a Grade 1 mortise non-keyed lever with a dummy function, and the Emtek 3102 Memphis, 3104 Hamilton, 3106 Manhattan and 3019 Brisbane mortise entrance locksets are also dummy function. Dummy trim mounts to the door face and does not latch or lock, so it suits an inactive leaf rather than a secured classroom opening.
12) What is the difference between the ML2052 and a Baldwin 6310 mortise lock body for a classroom retrofit?
The Corbin Russwin ML2052 uses a 2-3/4 inch backset and is built for 1-3/4 inch doors, with a Classroom Intruder function keyed from both sides. The Baldwin 6310 entrance and storeroom mortise lock body is a 2-1/2 inch backset unit for doors 1-3/8 inch and over, offered knob by knob, with the 6310190RRLS as a right hand reverse lever by lever version. The Baldwin 6301 is the same 2-1/2 inch backset in an entry and apartment function for doors 1-3/4 inch and over, in knob by knob or the 6301LS lever by lever. The backset difference means the door prep is not interchangeable with the ML2052.
13) If I need the classroom door tied into an access control system, what mortise lock takes the place of an ML2052?
The Corbin Russwin ML2052 is a mechanical lockset with no electrical option in this configuration. For an access controlled opening, the Schlage L9092EU with 03A trim is a heavy duty electric lock and unlock outside lever mortise lock, keyed outside, with request to exit and 12/24VDC operation for 1-3/4 inch doors, and the BEST 45HW is a heavy duty wired electromechanical mortise lock with 12V/24V operation. Where the run of wire to the door is the obstacle, the Schlage LEMD-GRW is a Grade 1 ENGAGE wireless mortise lock with a 125kHz proximity reader, mobile enabled deadbolt with LED and Greenwich trim, right hand, with a 3 hour fire rating.
14) How do I know from the corridor whether a classroom intruder lock is locked?
Status indicator options are available on the ML2000 Series for locked/unlocked visibility, offered on both sectional and escutcheon trim. If visual indication is a district requirement, specify the indicator trim rather than a plain rose. A cross-brand alternative already built around indication is the Marks USA LA318GJ classroom security indicator mortise lockset, a Grade 1 lock for 1-3/4 inch doors.
15) What trim do I need to pick when ordering an ML2052 mortise lock?
Three trim choices decide the look and the door face prep. Lever design comes in Armstrong, Citation, Dirke, Essex, Lustra, Newport, Princeton and Regis. Rose or escutcheon is A rose at 2-1/4 inch diameter, F rose at 2-7/8 inch diameter, or M and N escutcheons. Finishes run from 605 bright brass through 626 satin chrome, 630 satin stainless and BSP black suede powder coat, fourteen in all. Trim is thru-bolted for alignment. Escutcheon trim covers more of the door face than a rose, which matters when you are replacing an older lock and want to hide the previous prep.
16) Should I use a mechanical classroom intruder mortise lock or an electronic one for a school retrofit?
The ML2052 is a purely mechanical lock, no power, no batteries, no wiring to the frame. For a corridor of classrooms where the teacher locks the door with a key, that is the lower-maintenance answer and it keeps working when the power drops. Go electronic when you need credentials, audit trail or lockdown from a central point: TownSteel's FME-4000 Series is an electronic intruder classroom mortise lockset with RFID for 1-3/4 inch doors, and the Alarm Lock DL3500CR is a Grade 1 electronic classroom mortise lock with 300 user codes for 1-5/8 to 1-7/8 inch doors. Watch that thickness difference, the Alarm Lock units do not cover a 1-3/4 inch door as a standard.
17) What is a Grade 1 rating worth on a classroom lock, and how many cycles has the ML2052 been tested to?
Grade 1 under ANSI/BHMA A156.13 Series 1000 is the top mortise lock tier for both operational and security grade, which is what a school or hospital spec normally calls for. The ML2000 Series went well past the requirement in UL cycle testing at 14.5 million cycles, verification ID V875753. On a classroom door opened dozens of times a day that is the number that matters more than the grade label.
18) I need a Grade 1 classroom mortise lock but not the intruder double-cylinder function. What else is there?
If the room only needs standard classroom function, locked and unlocked from the corridor side by key, the Cal-Royal NM8070 is a heavy duty Grade 1 classroom mortise lockset with auxiliary deadlatch for 1-3/4 inch doors. For a storeroom door that stays locked at all times, the Cal-Royal NM8080 or the Accentra 8805FL Grade 1 storeroom mortise with Arcadia lever cover it. The ML2052 is the one to keep when you specifically want key control from inside the classroom.
19) Can I standardize a whole building on one mortise lockbody and change functions later?
That is how the ML2000 Series is set up. Twelve functions are configurable from a single ML2054 lockbody, so a facility can stock one body and field-configure the openings rather than carrying a dozen part numbers. Every function shares the same 2-3/4 inch backset and 5-7/8 x 4 x 15/16 inch case, so the door prep is identical across the building and a function change later does not mean a new mortise pocket.
20) Is there a simpler mortise lock to use on classroom doors that do not need key control?
The Corbin Russwin ML2052 is a keyed mortise lock built around locking the outside lever by key from either side. Where an opening does not need that, the Falcon MA101 is a Grade 1 heavy duty mortise passage lock with field reversible operation and a fire rating, and the Schlage PM010 is a Grade 1 non-keyed passage latch mortise lock for 1-3/4 inch doors. The Hager 3810S and 3810E are Grade 1 passage mortise locks with a 2-3/4 inch backset, the 3810S with rose trim and the 3810E with escutcheon trim, matching the 2-3/4 inch backset the ML2052 uses.
21) Which mortise lock replaces an ML2052 on an office or dormitory door rather than a classroom?
The Corbin Russwin ML2052 carries ANSI function F32, the classroom intruder arrangement. For an office opening, the Cal-Royal NM8050 is a heavy duty Grade 1 office and entrance mortise lockset with auxiliary deadlatch for 1-3/4 inch doors, and the Hager 3850E is a Grade 1 non-keyed office mortise lock with lever and escutcheon on a 2-3/4 inch backset. For dormitory corridor doors, the Sargent 7925 is a Grade 1 heavy duty dormitory exit function mortise lock with rose trim and a single cylinder deadbolt, where the ML2052 is a double cylinder keyed function.
22) Can a mortise deadbolt like the Sargent 4874 be used instead of an ML2052 on a classroom door?
They do different jobs. The Corbin Russwin ML2052 combines a 3/4 inch latchbolt, an auxiliary deadlocking latch and a 1 inch deadbolt in one lockcase with lever trim, so the door latches and releases on the inside lever for free egress. The Sargent 4874 is a double cylinder mortise deadbolt on a 2-3/4 inch backset with no latch or lever, and the Alarm Lock DL4500 is a Grade 1 electronic mortise deadbolt with 2,000 user codes and privacy keypad. A deadbolt alone leaves the door without a latch, so it is an addition to an opening rather than a replacement for a classroom lockset.
23) What mortise lockset should I use instead of an ML2052 on a behavioral health or ligature-resistant opening?
The Corbin Russwin ML2052 is a lever lockset offered with Behavioral Health BHSS and BLSS trim among its trim designs. Where the opening calls for a dedicated ligature-resistant assembly, 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 same passage function with satin stainless ligature-resistant arch trim. The Marks USA 5PDN is a Grade 1 hospital passage mortise push and pull paddleset, ligature resistant and ADA compliant in satin stainless steel. All three are passage function, so they do not provide the key locking the ML2052 does.
24) Is a BEST 45H public entrance mortise lock the same thing as an ML2052 classroom intruder lock?
No. The BEST 45H is a heavy duty mortise lock body with a public entrance function and field reversible operation, which leaves the outside lever always free unless locked. The Corbin Russwin ML2052 is the classroom intruder arrangement: the latchbolt operates by grip from either side unless the outside grip is locked by key from either side, with the latchbolt retractable by key when the outside grip is locked. Both are field reversible, so the handing decision is not what separates them, the locking behavior is. The BEST 45HCA with intruder function is the closer match to the ML2052.
25) Which mortise lock do I use instead of an ML2052 on a restroom or bedroom door?
The Corbin Russwin ML2052 is keyed on both sides for classroom intruder duty, which is not the function for a privacy opening. The Cal-Royal NM8440 is a heavy duty Grade 1 privacy mortise lockset with deadbolt for 1-3/4 inch doors, and the Hager 3840S is a Grade 1 privacy mortise lock on a 2-3/4 inch backset for doors 1-3/4 inch to 2 inch, matching the backset the ML2052 uses. Where the privacy door also needs code entry, the Schlage CO-100 is a Grade 1 heavy duty standalone electronic mortise lock in privacy function with a keypad reader for 1-3/4 inch doors.
26) What holds up in a high-abuse corridor or a behavioral health room?
For vandal-prone openings the ML2000VR option uses stainless steel escutcheons with tapered edges and Torx pin tamper-resistant screws, and the series offers Behavioral Health trim (BHSS/BLSS). The lockcase itself is heavy-gauge steel with a one-piece stainless steel deadbolt. Where the requirement is full anti-ligature rather than vandal resistance, TownSteel's MRX-L-01 is a Grade 1 stainless anti-ligature lever mortise lockset and the MRX-A-01 is the arch trim version, both passage function for 1-3/4 inch doors.
27) Does the ML2052 close easily on a door with a closer fighting it?
The latchbolt is a two-piece mechanical design with an anti-friction insert, which cuts the force needed to close the door against a closer or stack pressure. It measures 5/8 x 1 inches with a 3/4 inch throw, and the deadlocking auxiliary latch rides alongside it at 9/16 inch effective throw. On a fire-rated classroom door with a heavy closer, that anti-friction latch is the difference between the door latching every time and being left standing ajar.
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Does the Corbin Russwin COR-ML2052-NSA-626 come with a warranty?
Absolutely. The Corbin Russwin COR-ML2052-NSA-626 is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
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