Sargent 8243-ET Heavy Duty Mor...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$2,018.43
$1,392.34
Sargent Sargent 8200 Series - (8243) Apartment Corridor Function Escutcheon Trim, Heavy Duty Single Cylinder with Deadbolt Mortise Lock, Grade 1 SGT-8243-ET

Sargent 8243-ET Heavy Duty Mortise Lock with Deadbolt - Apartment Corridor Function Grade 1

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Model: 8243 LE1A 26D
From the 8200 Series Collection
$2,018.43
$1,392.34
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$2,018.43
$1,392.34
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Sargent 8243-ET Heavy Duty Mortise Lock with Deadbolt - Grade 1 Apartment Corridor Function

Industry Benchmark Mortise Lock with Maximum Security and Performance

The Sargent 8243-ET represents the industry benchmark for commercial mortise locks, delivering maximum security, performance, and durability with high-quality components. This Grade 1 apartment corridor function lock features a heavy-duty single cylinder with deadbolt design, 2 3/4" backset depth, and 1 3/4" door thickness compatibility. The multi-functional lock body accommodates a variety of lever and escutcheon styles while maintaining robust construction that exceeds independently verified testing standards.

Professional Features & Benefits

  • Heavy-Duty Durability: UL Cycle Above and Beyond test completed at 16 million cycles (Verification ID: V584148) for exceptional longevity in high-traffic commercial applications.
  • Grade 1 Performance: ANSI/BHMA A156.13 Series 1000 Operational Grade 1 certification ensures maximum security and reliability for demanding commercial environments.
  • Door Compatibility: Designed for 1 3/4" door thickness with 2 3/4" backset depth for standard commercial door installations.
  • Fire-Rated Construction: UL 10C Fire-Rated up to 3 hours with positive pressure certification for life safety applications.
  • Universal Key System Integration: Integrates with all SARGENT key systems including Degree, Signature, KESO, and XC for flexible master keying options.
  • Field Reversible Handing: Accommodates both left and right-hand door installations without additional parts or modifications.
  • Comprehensive Certifications: ADA compliant, NFPA 80 compliant, and certified to multiple ASTM standards including E330, E1996, E1886, and TAS 201/202/203.
  • Manufacturer Warranty: 10-year limited warranty on mechanical components with 2-year coverage on electrical components for added confidence and protection.

Technical Specifications

  • Refer to manufacturer documentation for complete technical specifications.

Installation & Operation

  1. Review manufacturer specifications and verify door preparation requirements including 1 3/4" door thickness, 2 3/4" backset depth, and handing as applicable to this mortise lock.
  2. Use manufacturer-provided templates to mark mounting hole locations accurately on door and frame surfaces for proper mortise preparation.
  3. Prepare door and frame by drilling required holes and routing mortise cavity as specified in manufacturer instructions.
  4. Install all mounting hardware including strike plate and secure the lock body to door per manufacturer torque specifications.
  5. Adjust operational components including latchbolt throw for proper alignment, latching, and smooth operation throughout the full range of motion.
  6. Test device operation to verify proper function of both latch and deadbolt mechanisms and make final adjustments as needed. Refer to manufacturer documentation for complete installation details and troubleshooting.

Professional Applications

  • Commercial Office Buildings
  • Educational Facilities
  • Healthcare Institutions
  • Retail Establishments
  • Industrial and Warehouse Facilities
  • Multi-Tenant Residential Properties
  • Government and Municipal Buildings

Why Choose Sargent Quality?

Sargent mortise locks deliver professional-grade reliability with patented design and construction rated for 16 million cycles in UL testing. The 10-year limited warranty on mechanical components with 2-year electrical coverage demonstrates confidence in long-term performance. Engineered for demanding commercial applications where dependable security and maximum durability are essential.

Product Specs

Series:
8200 Series
Grade:
Grade 1
Keyed Function:
Single Cylinder
Product Group:
Mechanical Locks
Product Subgroup:
Bored Locksets
Subcategory:
Bored Locksets
Keyed:
Yes
Commercial/Residential:
Commercial
Lock Type:
Mortise
Lock Function:
Apartment Corridor
Product Type:
Mortise Locks
Duty Level:
Heavy Duty
Handle Type:
Lever
Product Attribute:
Mortise Locks
Electronic:
No
Product Function:
Corridor
Product Category:
Mechanical Locks
Collection:
8200 Series
Department:
Door Hardware

Sargent 8243 LE1A 26D – Frequently Asked Questions

1) Will the Sargent 8243 mortise lock fit a 1-3/4 inch commercial door?
Yes. The 8243-ET is built for 1-3/4 inch door thickness with a 2-3/4 inch backset, which is the standard commercial mortise prep. If your doors are thicker or the existing mortise pocket sits at a 2-3/8 inch backset, this is not the lock for that opening.
2) What does apartment corridor function mean on a Sargent 8243 mortise lock?
Apartment corridor is the multi-family unit-entry function: a keyed lever outside with a separate deadbolt, operated by key from the corridor side and by thumbturn from inside. It is a single cylinder lock, so there is one keyed cylinder on the outside only, and both the latch and the deadbolt retract together from the inside lever for free egress. That is what makes it the standard choice on apartment entry doors rather than a storeroom or classroom function.
3) Can the Sargent 8243 be used on a fire rated apartment entry door?
Yes. The 8243 is UL 10C fire rated up to 3 hours with positive pressure certification and is NFPA 80 compliant, so it is usable on a 3 hour rated unit entry. It is also ANSI/BHMA A156.13 Series 1000 Operational Grade 1 and ADA compliant.
4) What do I need to specify when ordering a Sargent 8243 mortise lock?
Four things. Cylinder: standard cylinder, less cylinder, 70 for small format interchangeable core prep less core, or 60 for large format interchangeable core prep less core. Keying: keyed different, keyed alike, a specific key code, or none if you picked less cylinder. Escutcheon trim: LE1, LS, LW1 or WT. And lever design: A, B, E, F, J, L, P or W. Finish is chosen separately from sixteen options.
5) Can a Sargent 8243 be master keyed into an existing building key system?
Yes. The 8243 integrates with all Sargent key systems including Degree, Signature, KESO and XC, so it can be master keyed into an existing Sargent hierarchy. If your property runs a different manufacturer's core, order it with the 70 small format or 60 large format interchangeable core prep less core and drop your own cores in.
6) What mortise lock should be used on an apartment door that needs keypad or credential access instead of a key?
The Sargent 8243-ET is a mechanical, keyed mortise lock. For credential-based access on the same style of opening, the Schlage Electronics LEBMB-ADD is a mobile-enabled mortise lock covering privacy, office and apartment functions, rated Grade 2 with a 3 hour fire rating for 1-3/4 inch doors. The Dormakaba E-Plex 2066 is an electronic pushbutton keyless mortise lock. Note the LEBMB-ADD is Grade 2 where the Sargent 8243-ET is Grade 1, so a spec calling for Grade 1 will not accept it.
7) What is the closest equivalent to a Sargent 8243 apartment corridor mortise lock from another manufacturer?
The Baldwin 6301LS is a lever-by-lever mortise lock body with an Entrance/Apartment function, which is the same tenant-door behavior the Sargent 8243-ET covers with its Apartment Corridor function and single-cylinder deadbolt. The Baldwin 6301LS lock body is listed for doors 1-3/4 inch and over, while the Sargent 8243-ET is built for 1-3/4 inch doors at a 2-3/4 inch backset. Baldwin's 6301 body uses a 2-1/2 inch backset, so the door and frame prep is not interchangeable between the two - confirm which backset the existing mortise pocket was cut for before substituting.
8) If the door does not need a deadbolt, what mortise lock should be used instead of the 8243?
The Sargent 8243-ET is a single-cylinder mortise lock with a deadbolt. Where the opening only needs a keyed latch and no separate deadbolt, the Cal-Royal NM8050 is a Grade 1 Entrance/Office mortise lockset with an auxiliary deadlatch for 1-3/4 inch doors, and the Cal-Royal NM8080 is a Grade 1 storeroom mortise lockset for the same door thickness with an interchangeable core option. Both hold the same ANSI/BHMA Grade 1 rating as the 8243-ET without the deadbolt throw in the lock body.
9) Is the Schlage L9092EU a substitute for a Sargent 8243 corridor lock?
Only where the opening is wired. The Schlage 03A L9092EU is a heavy duty corridor-function mortise lock for 1-3/4 inch doors, but it is an electric lock/unlock outside lever running on 12/24VDC with request-to-exit signaling. The Sargent 8243-ET is a non-electronic mechanical corridor lock with a single cylinder and deadbolt. If there is no power transfer in the frame and no access control head end, the mechanical 8243-ET is the one that installs; the Schlage requires door cord or hinge power and a controller.
10) What Grade 1 mortise lock works on doors thicker than 1-3/4 inch?
The Sargent 8243-ET is built for 1-3/4 inch door thickness. On a thicker door, the Hager 3800 Series covers a 1-3/4 inch to 2-1/2 inch range at a 2-3/4 inch backset - the 3810E passage lock with escutcheon and the 3850E office lock with lever and escutcheon both fall in that range. Those Hager bodies are passage and non-keyed office functions rather than the keyed apartment corridor function with deadbolt that the 8243-ET provides, so match the function to the opening as well as the thickness.
11) How many cycles is the Sargent 8243 rated for in high traffic buildings?
The UL Cycle Above and Beyond test was completed at 16 million cycles, verification ID V584148. For context, that is heavy duty commercial territory, which is why it holds up on apartment corridor and multi-tenant entry doors that get hit hundreds of times a day.
12) What finishes does the Sargent 8243 come in to match the rest of my building?
Sixteen finishes: 03 bright brass, 04 satin brass, 09 bright bronze, 10 satin bronze, 10B dark oxidized satin bronze oil rubbed, 10BE, 10BL, 14 bright nickel, 15 satin nickel, 20D dark statuary bronze, 26 bright chrome, 26D satin chrome, 32 bright stainless, 32D satin stainless, BSP black suede powder coat and WSP white suede powder coat. For most commercial corridors 26D satin chrome or 32D satin stainless is what already hangs on the other doors.
13) Is there a Sargent mortise lock for apartment entry that does not need a separate deadbolt installed?
The 8243 already has the deadbolt built into the lock body, so you mortise one pocket and get both the latch and the deadbolt. You do not add a second deadbolt above it. That is the main reason apartment corridor function is specified on unit doors instead of a storeroom lock plus a standalone deadbolt.
14) What is the difference between the Sargent 8243 and a storeroom function mortise lock?
Function, not build. The 8243 is apartment corridor with a deadbolt, meant for a tenant unit door where the occupant wants to throw a bolt. A storeroom lock leaves the outside lever locked at all times with no deadbolt, which is what you want on mechanical and utility rooms. If storeroom is the function you actually need, the Accentra 8805FL and the Cal-Royal NM8080 are Grade 1 storeroom mortise locks, and the NM8080 is offered with an interchangeable core option.
15) What is the difference between a Sargent 8243 and a Corbin Russwin ML2003?
Function. The Corbin Russwin ML2003 is a Grade 1 mortise classroom lockset for 1-3/4 inch doors, keyed so the outside lever is locked and unlocked by key. The Sargent 8243-ET is a Grade 1 apartment corridor lock with a single cylinder and a deadbolt, intended for tenant entry doors rather than classroom doors. Both are Grade 1 mortise bodies built for 1-3/4 inch doors, so the door prep is comparable, but they do not lock the same way and are not function substitutes for one another.
16) Can an Emtek 3102 Memphis mortise lockset replace a Sargent 8243?
No. The Emtek 3102 Memphis is a dummy mortise entrance lockset - dummy trim does not latch, lock or accept a key. The Sargent 8243-ET is a keyed Grade 1 apartment corridor lock with a single cylinder and deadbolt. Emtek dummy sets like the 3102 Memphis, 3104 Hamilton and 3106 Manhattan are for inactive leaves and closet doors, not for a secured tenant entry.
17) What mortise lock is used for the storeroom and service doors in the same building as an 8243 apartment corridor lock?
The Accentra 8805FL is a Grade 1 storeroom mortise lock with an Arcadia lever, and the Cal-Royal NM8080 is a Grade 1 storeroom mortise lockset for 1-3/4 inch doors with an interchangeable core option. Both carry the same Grade 1 rating as the Sargent 8243-ET, so a property standardizing on Grade 1 mortise hardware can run the 8243-ET on tenant entries and a storeroom function on the back-of-house doors without dropping grade.
18) Is a Kaba Ilco 185 mortise deadbolt an alternative to the 8243?
They do different jobs. The Kaba Ilco 185 Series is a deadbolt-function mortise lock supplied with no handing. The Sargent 8243-ET combines a lever-operated latch with a deadbolt in one body, keyed single cylinder, on 1-3/4 inch doors at a 2-3/4 inch backset. If the door already has a separate lever latch and only needs added deadbolting, the 185 Series is the narrower part; if one body must handle both latching and deadbolting, the 8243-ET does it in a single mortise pocket.
19) What is the difference between the Sargent 8243 and the Cal-Royal NM8440 privacy mortise lock with deadbolt?
Both bodies carry a deadbolt, but the credential differs. The Cal-Royal NM8440 is a Grade 1 Privacy/Bed/Bath mortise lockset with deadbolt for 1-3/4 inch doors - thumbturn privacy, not a keyed entry. The Sargent 8243-ET is a keyed Grade 1 apartment corridor lock with a single cylinder, so a tenant or building key operates it and it integrates with SARGENT key systems for master keying. Use the NM8440 on a bathroom or bedroom door and the 8243-ET where the deadbolt must be key-operated.
20) For an anti-ligature or behavioral health opening, what mortise lock is used instead of a standard corridor lock?
The TownSteel MRX-L-01 is a Grade 1 heavy duty anti-ligature lever mortise lockset in stainless steel with a passage function for 1-3/4 inch doors, and the MRX-A-01 is the same passage function with ligature-resistant arch trim. The Marks USA 5PDN is a Grade 1 hospital passage mortise push/pull paddleset, ligature resistant and ADA compliant in satin stainless steel. All three are passage function, where the Sargent 8243-ET is a keyed apartment corridor lock - the ligature-resistant sets do not lock, so security has to come from elsewhere on that opening.
21) Which mortise lock bodies are field reversible like the Sargent 8243?
The Sargent 8243-ET accommodates left and right hand doors without additional parts. Among other heavy duty mortise bodies, the BEST 45H public entrance lock body is field reversible, and the Falcon MA101 is a Grade 1 heavy-duty mortise passage lock with field reversible operation and a fire rating. Handing on those is set in the field, which matters when stocking one part number across a mixed set of openings rather than ordering handed.
22) Will the Sargent 8243 accept different lever and trim styles later without changing the lock body?
The 8243 lock body takes a variety of lever and escutcheon styles, so the same body carries any of the eight lever designs (A, B, E, F, J, L, P, W) and four escutcheons (LE1, LS, LW1, WT). Useful for a property standardizing on one lock body across a portfolio while letting individual buildings differ on trim appearance.
23) Can I order the Sargent 8243 keyed alike across a set of doors?
Yes. Keying options are keyed different, keyed alike, or keyed to a specific key code you supply at order. Keyed alike is the usual pick for a maintenance or common-area set; individual tenant doors normally go keyed different under a master.
24) Is the Sargent 8243 rated for hurricane or impact-tested door assemblies?
It is certified to ASTM E330, E1996 and E1886 and to TAS 201, 202 and 203, which are the structural load and large missile impact protocols used on Florida and coastal openings. That makes it usable in assemblies where the hardware itself has to carry the impact certification.
25) Can I order the Sargent 8243 without a cylinder so I can use my own?
Yes. Choose the less cylinder option and pair it with the none keying selection, and the lock ships with no cylinder for you to fit your own. If you run interchangeable cores instead, the 70 small format prep or 60 large format prep both ship less core with the housing already prepped.
26) Does the Schlage PM010 work as a lower-cost alternative to the Sargent 8243?
Not on a secured door. The Schlage PM010 is a Grade 1 passage latch mortise lock, non-keyed, for 1-3/4 inch doors - it latches the door but nothing locks. The Sargent 8243-ET is keyed with a single cylinder and a deadbolt on the same 1-3/4 inch door thickness. A PM010 suits a corridor or closet door that only needs to stay shut; any door needing a key belongs on the 8243-ET.
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Does the Sargent 8243 LE1A 26D come with a warranty?
Absolutely. The Sargent 8243 LE1A 26D 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 Sargent 8243 LE1A 26D?
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