Corbin Russwin ML2052 Grade 1 ...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$676.75
$489.55
Corbin Russwin ML2052 Mortise Classroom Intruder Door Lever Lockset Body Only

Corbin Russwin ML2052 Grade 1 Mortise Classroom Intruder Door Lever Lockset Body Only

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Model: ML2052-LL-626
From the ML2000_Series Collection
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$676.75
$489.55
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Corbin Russwin ML2052 Classroom Intruder Mortise Lockset Body Only Grade 1, Field Reversible, 1-3/4" Door

ANSI F32 Classroom Intruder Function Commercial-Grade Mortise Lock Body for High-Traffic Security Applications

The Corbin Russwin ML2052 is a Grade 1 mortise lockset body engineered for classroom intruder (ANSI function F32) applications in demanding commercial, institutional, and government environments. Constructed of heavy-gauge steel with a 1" stainless steel deadbolt and patented Quick Reversible latchbolt, this lockset body fits standard 1-3/4" (44mm) doors and is field reversible for flexible installation. The ML2052 delivers 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 — providing critical life-safety egress at all times. The included ANSI straight lip strike measures 4-7/8" (124mm) x 1-1/4" (32mm) x 1-1/8" (29mm) lip to center, and the auxiliary latch deadlocks the latchbolt for added security.

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 (Classroom Intruder Lockdown)
  • Higher Education Campuses
  • Healthcare Institutions and Hospitals
  • Commercial Office Buildings
  • Government and Municipal Buildings
  • Hotels and Hospitality Properties
  • Industrial and Institutional Facilities

Why Choose Corbin Russwin Quality?

Corbin Russwin ML2000 Series mortise lock products deliver professional-grade reliability through heavy-gauge steel construction with a 1" stainless steel deadbolt, rated for an extraordinary 14.5 Million Cycles in UL testing (Verification ID: V875753) — well above and beyond standard requirements. The ML2052 is backed by a 10 Year Limited warranty and is Grade 1 certified, making it the trusted choice for offices, schools, hospitals, hotels, and other high-use commercial applications where dependable security and life-safety performance 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:
ML2052
Collection:
ML2000_Series
Product Function:
Classroom Intruder
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 ML2052-LL-626 – Frequently Asked Questions

1) What exactly comes with the Corbin Russwin ML2052 classroom intruder mortise lock, and what do I still have to order?
The ML2052 is the lock case only, not a complete lockset. You get the mortise lock body with its armored front and the ANSI straight lip strike (4-7/8 x 1-1/4 x 1-1/8 inch lip to center). Lever or knob trim, roses or escutcheons, and cylinders are separate line items. Plan on ordering trim for both sides and two cylinders, since the F32 classroom intruder function keys from either side of the door.
2) What does the classroom intruder function actually do during a lockdown?
With the ML2052, a teacher locks the outside lever by key from inside the room, so nobody has to step into the corridor to secure the door. Latchbolt retracts by grip from either side unless that outside grip is locked by key from either side. The inside grip is always free, so egress is never blocked even when the outside is locked down. That is ANSI F32.
3) Will the ML2052 mortise lock fit a 1-3/4 inch commercial door, and does handing matter when I order?
1-3/4 inch (44mm) is the standard door thickness for the ML2052, with other thicknesses available as options. Handing is not a problem at order time: the patented Quick Reversible latchbolt lets you re-hand the lock in the field without opening the lock case, so one body covers left and right hand openings. Backset is 2-3/4 inches, the usual commercial mortise backset.
4) Will the ML2052 drop into an existing mortise pocket without recutting the door?
The lock case measures 5-7/8 x 4 x 15/16 inches with an 8 x 1-1/4 inch armored front, on a 2-3/4 inch backset, which is the standard ANSI mortise pocket and face prep. Check your cross-bore spacing too: center to center is 3-5/8 inches (92mm) lever to cylinder and 2-7/16 inches (62mm) lever to thumbturn. If your existing door matches those, it is a swap. If the old lock used a different spacing, the face holes will not line up.
5) Can I use the ML2052 on a fire rated classroom door?
Yes. The ML2052 is UL/cUL listed and UL10C positive pressure rated, good for 3-hour fire doors up to 4 by 10 feet single or 8 by 10 feet pair. It also meets ANSI/BHMA A156.13 Series 1000 Grade 1 operational and security, ADA A117.1, California State Fire Marshal, and windstorm/hurricane certification.
6) Will the ML2052 work with the Corbin Russwin keys we already use in our school?
It can be set up on new or existing Corbin Russwin key systems, and it accepts most other manufacturers' cylinders, so a district standardized on another keyway is not locked out. Standard cylinder is brass, 6-pin, L4 keyway, shipped 0-bitted. Since the lock body ships without cylinders, specify keying when you order the cylinders themselves.
7) What is the closest Grade 1 mortise lock body alternative to the Corbin Russwin ML2052?
The Accentra 8800FL Series mortise lock body is the closest peer: it is also an ANSI/BHMA Grade 1 mortise lock body with field reversible handing, matching the ML2052's Grade 1 rating and field reversible hand. The difference is the key system and function scope. The ML2052 is supplied as a Classroom Intruder function body, keyed from either side to lock the outside lever while the inside lever stays free, and it works with new or existing Corbin Russwin key systems while accepting most other manufacturers' cylinders. If the building is already standardized on Corbin Russwin keying or on ML2000 trim, stay with the ML2052; if the site is an Accentra/Yale keyway house, the 8800FL body is the natural counterpart.
8) Will the latchbolt catch my existing mortise strike, and is there a deadbolt too?
The two-piece anti-friction latchbolt throws 3/4 inch (19mm) and the auxiliary latch gives 9/16 inch effective throw to deadlock it, so it seats in a standard ANSI mortise strike. There is also a one-piece stainless steel deadbolt with a full 1 inch throw for a genuinely secured door. The supplied ANSI straight lip strike is 4-7/8 x 1-1/4 x 1-1/8 inch lip to center; if your frame is cut for a different lip length, use a strike matched to your jamb stop.
9) Is this mortise lock heavy duty enough for a high school corridor?
Heavy-gauge steel case, Grade 1 operational and security under A156.13, and UL cycle tested to 14.5 million cycles (Verification ID V875753), which is well past the Grade 1 minimum. The anti-friction latch also cuts the closing force needed, which matters on doors slammed hundreds of times a day.
10) Is there another Grade 1 field reversible mortise lock body if I am standardized on a different brand?
Accentra's 8800FL Series mortise lock body is the cross-brand counterpart we carry, also Grade 1 with field reversible handing. It is a different case and face prep family, so it is a brand-standardization choice rather than a drop-in swap for an ML2000 pocket. If the building is already Corbin Russwin, staying with the ML2052 keeps prep, trim, and cylinders consistent.
11) Can one ML2000 lock body cover several different classroom functions, or do I order a separate body per function?
Within the ML2000 family the multi-function ML2054 body configures to 12 different functions from one case, which is how facilities cut the number of part numbers they stock. The ML2052 is the dedicated F32 classroom intruder body. If your spec is strictly classroom intruder, order the ML2052; if you want one shelf part that can be set to several functions across a building, look at the multi-function body instead.
12) Can I get a visual indicator showing whether the classroom door is locked?
Status indicator options for locked/unlocked visibility are offered on ML2000 sectional and escutcheon trim, so the indicator comes from the trim you pair with the ML2052 body, not from the case. Trim families include Museo, Vineyard, and the Behavioral Health BHSS/BLSS designs, and trim is thru-bolted for alignment and security.
13) Does the ML2052 have any electrified option for remote lockdown?
The ML2052 itself is a mechanical lock body with no electrical components. Motorized Electric Latch Retraction (MELR) is offered on the ML20900 series, so an access-control or remote-release opening needs that series rather than this body.
14) Do I need to order the ML2052 handed, or can I stock one body for both left and right doors?
One body covers both hands. The ML2052 is field reversible, with a Quick Reversible latchbolt that re-hands without opening the lock case. The comparable Accentra 8800FL Series mortise lock body is also field reversible, so either choice lets a school or campus stock a single body number for left-hand and right-hand openings rather than splitting inventory by hand.
15) I ordered a mortise lock body but no lever or trim showed up - is that normal for the ML2052?
Yes. The ML2052 is sold as a mortise lockbody only, so the lever trim, roses or escutcheons, and cylinder are ordered separately and matched to the finish you select for the body. The comparable Accentra 8800FL Series is likewise a mortise lock body. When you are pricing either against a complete lockset, budget the trim and cylinder as separate line items so the opening is not left short on install day.
16) Our doors are thicker than 1-3/4 inch - should I still order the ML2052 or look at another body?
Stay with the ML2052 family and specify the thickness. The standard ML2052 body is built for a 1-3/4 inch door, with optional thicknesses available on request, so a thicker door is handled by the order note rather than by switching to a different lock body. Confirm the door thickness before ordering, because trim spindle and cylinder length follow it.
17) Is an electrified or electric latch retraction lock a drop-in substitute for the ML2052?
No. The ML2052 is a non-electronic mechanical mortise lock body; there is no power transfer, wiring, or door loop involved. Motorized Electric Latch Retraction is a feature of the ML20900 series rather than of the ML2052 itself, so specifying an electrified body changes the door prep, the hinge or power transfer, and the access control scope of the job. For a straight mechanical classroom intruder opening, the ML2052 is the correct body, and the peer Accentra 8800FL Series body is likewise a mechanical Grade 1 mortise body.
18) What finishes does the ML2052 mortise lock body come in?
Fourteen finishes: 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. On a body-only order the finish shows on the armored front and strike, so match it to the trim you are ordering. 626 and 630 are the usual institutional picks.
How fast can I get the Corbin Russwin ML2052-LL-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 ML2052-LL-626 come with a warranty?
Absolutely. The Corbin Russwin ML2052-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 ML2052-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
Why buy the Corbin Russwin ML2052-LL-626 from ZenSupply?
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