Sargent 8259-ET School Securit...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$1,932.33
$1,470.67
Sargent Sargent 8200 Series - (8259) School Security Function Escutcheon Trim, Heavy Duty Double Cylinder Mortise Lock, Grade 1 SGT-8259-ET

Sargent 8259-ET School Security Function Heavy Duty Double Cylinder Mortise Lock with Escutcheon Trim

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Model: 8259 LE1A 26D
From the 8200 Series Collection
$1,932.33
$1,470.67
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$1,932.33
$1,470.67
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Sargent 8200 Series School Security Function Heavy Duty Double Cylinder Mortise Lock with Escutcheon Trim

Professional Grade 1 Mortise Lock for Educational Facility Security

The Sargent 8200 Series mortise lock delivers maximum security, performance, and durability with heavy-duty components designed for demanding commercial applications. This Grade 1 mortise lock features a 2 3/4" backset, 1 3/4" door thickness compatibility, and 3/4" latchbolt throw for reliable operation. Certified to ANSI/BHMA A156.13 Series 1000 standards and UL 10C fire-rated up to 3 hours, this lock integrates with all SARGENT key systems including Degree, Signature, KESO, and XC.

Professional Features & Benefits

  • Dimensional Specifications: 2 3/4" backset with 1 3/4" door thickness compatibility and 3/4" latchbolt throw for precise installation requirements.
  • Heavy-Duty Durability: Exceeds independently verified testing with completion of UL Cycle Above and Beyond test at 16 million cycles for exceptional durability in high-traffic applications.
  • Grade 1 Performance: ANSI/BHMA A156.13 Series 1000 Operational Grade 1 certification ensures maximum security and reliability for commercial installations.
  • Fire Rating Compliance: UL 10C positive pressure fire-rated up to 3 hours with NFPA 80 compliance for critical life safety applications.
  • Universal Key System Integration: Compatible with all SARGENT key systems including Degree, Signature, KESO, and XC providing flexible master keying options.
  • Field Reversible Handing: Allows on-site configuration for left or right-hand applications without additional parts or modifications.
  • Multi-Functional Design: Available in 56 different functions including electromechanical, security and monitoring options with easy on-site function switching.
  • Manufacturer Warranty: 10-year limited warranty 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, and handing as applicable to this product.
  2. Use manufacturer-provided templates to mark mounting hole locations accurately on door and frame surfaces.
  3. Prepare door and frame by drilling required holes and routing as specified in manufacturer instructions.
  4. Install all mounting hardware and secure the device to door and frame per manufacturer torque specifications.
  5. Adjust operational components for proper alignment, latching, and smooth operation throughout the full range of motion.
  6. Test device operation to verify proper function and make final adjustments as needed. Refer to manufacturer documentation for complete installation details and troubleshooting.

Professional Applications

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

Why Choose Sargent Quality?

Sargent 8200 Series mortise locks deliver professional-grade reliability with patented design and construction rated for 16 million cycles in UL testing. The 10-year limited warranty with 2-year electrical component coverage demonstrates confidence in long-term performance. Engineered for demanding commercial applications where dependable security and fire safety compliance are essential.

Product Specs

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

Sargent 8259 LE1A 26D – Frequently Asked Questions

1) What does the Sargent 8259 school security function actually do at the door?
The 8259 is a double cylinder school security function: there is a keyed cylinder on both sides, so the outside lever can be locked or unlocked by key from either the corridor or from inside the classroom. That lets a teacher secure the door during a lockdown without stepping into the hallway. Because both sides are keyed, check your local life safety requirements for classroom egress before specifying it.
2) Will the Sargent 8259 mortise lock fit a 1-3/4 inch door with a 2-3/4 inch backset prep?
That is exactly the prep it is built for. The 8259 uses a 2 3/4 inch backset and is set up for 1 3/4 inch door thickness, which is the standard commercial door. If your openings are thicker or thinner, this is not the lock for that door.
3) Will the Sargent 8200 latch into my existing ANSI mortise strike?
The latchbolt throws 3/4 inch, which is the normal throw for a commercial mortise lock, so it engages a standard ANSI mortise strike lip without special prep. Verify the existing pocket was cut for a 2 3/4 inch backset mortise body before you swap.
4) Do I have to order the Sargent 8259 handed, or can it be reversed in the field?
No handing decision at the order stage. The 8200 Series lock body is field reversible, so the same lock handles a left or right hand opening with no extra parts. Useful when you are stocking spares for a building with mixed swings.
5) Is the Sargent 8200 mortise lock fire rated for a labeled classroom door?
It is UL 10C positive pressure fire rated up to 3 hours and compliant with NFPA 80, so it can go on a labeled opening up to that rating.
6) What do I need to specify for cylinders and keying when ordering the Sargent 8259?
Two choices are required. Cylinder: standard cylinders supplied, 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 (entered in the key code field), or none if you selected less cylinder. Being a double cylinder function, it takes cylinders on both sides. The lock works with all SARGENT key systems including Degree, Signature, KESO and XC, so it drops into an existing Sargent masterkey system.
7) What mortise lock should I use instead of the Sargent 8259 on a standard classroom door that does not need double-cylinder lockdown?
The Sargent 8259-ET is a double cylinder School Security function lock. For a conventional single-cylinder classroom opening, the Corbin Russwin ML2003 is a Grade 1 mortise classroom lockset for 1-3/4 inch doors, and the Cal-Royal NM8070 is a Grade 1 heavy duty classroom mortise lockset for 1-3/4 inch doors with an auxiliary deadlatch.
8) I need access control on a school corridor door instead of a keyed lock like the Sargent 8259 - what are the options?
The Sargent 8259-ET is a mechanical, non-electronic lock. For credentialed access on the same type of opening, the TownSteel FME-2000 is a Grade 1 heavy duty classroom mortise lockset with RFID technology for 1-3/4 inch doors, the Schlage LEMD-GRW is a Grade 1 ENGAGE Series wireless mortise lock with a 125 kHz proximity reader and a 3 hour fire rating, and the Alarm Lock DL3500CR is a Grade 1 Trilogy electronic classroom mortise lock with 300 user codes for doors 1-5/8 to 1-7/8 inches thick.
9) What mortise lock takes the place of the Sargent 8259 on a behavioral health or patient door?
The Sargent 8259-ET uses lever trim with escutcheon plates, which is not suited to ligature-resistant applications. For those openings the TownSteel MRX-L-01 is a Grade 1 heavy duty anti-ligature lever mortise lockset in stainless steel with passage function for 1-3/4 inch doors, the MRX-A-01 is the same passage function with ligature resistant arch trim, and the Marks USA 5PDN is a Grade 1 hospital passage mortise push/pull paddleset that is ligature resistant and ADA compliant in satin stainless steel.
10) If the classroom door needs to be electrically locked or unlocked from a central system, what replaces the Sargent 8259?
The Sargent 8259-ET is a mechanical key-operated lock with no electrical option. For remote control of the outside lever, the Command Access ML190 is a heavy duty motorized mortise lock with field selectable EL/EU operation on 24VDC in storeroom function, the Schlage L9092EU with 03A trim is a heavy duty electric lock/unlock outside lever mortise lock, keyed outside, with request to exit and 12/24VDC, and the BEST 45HW is a heavy duty wired electromechanical mortise lock for 12V or 24V operation.
11) Which lever and escutcheon styles can I get on the Sargent 8200 escutcheon trim locks, and can I match the rest of the building?
Eight lever designs are offered (A, B, E, F, J, L, P and W) on four escutcheon styles: LE1, LS, LW1 and WT. Finishes run 16 deep, from 26D satin chrome and 32D satin stainless through brass, bronze, nickel, 10B oil rubbed bronze, and black or white suede powder coat. If the other classroom doors already carry Sargent 8200 trim, match the lever letter, escutcheon code and finish number and the new lock will look identical.
12) Is the Sargent 8259 tough enough for a high traffic school corridor?
It is a heavy duty Grade 1 commercial lock, certified to ANSI/BHMA A156.13 Series 1000 Operational Grade 1, and Sargent ran it through the UL Above and Beyond cycle test to 16 million cycles. That is the durability tier you want on classroom and corridor doors that get hit all day.
13) Should I use a mechanical school security mortise lock or an electronic classroom lock for a lockdown retrofit?
The 8259 is purely mechanical, no power, no batteries, no programming, and it locks from either side by key. That is the simplest lockdown answer for a school with an existing Sargent key system. If you want audit trails, credentials or remote control instead, look at electronic mortise locks such as the TownSteel FME-4000 Series electronic intruder classroom lock or the Alarm Lock DL3500CR Trilogy classroom lock with 300 user codes. Those add code or card control but bring battery and programming maintenance with them.
14) What Grade 1 mortise alternatives are there if I need a classroom or storeroom function instead of double cylinder school security?
Function is the deciding factor. For a conventional keyed classroom function, the Corbin Russwin ML2003 Grade 1 mortise classroom lockset and the Cal-Royal NM8070 classroom lockset both suit 1-3/4 inch doors. For storeroom, look at the Cal-Royal NM8080 or the Accentra 8805FL Grade 1 storeroom mortise lock. The Sargent 8259 differs from all of these by being keyed on both sides so the door can be secured from inside the room.
15) Is there a Grade 1 storeroom mortise lock to pair with the Sargent 8259 on doors that should always stay locked?
Yes. The Sargent 8259 handles the classroom or school security opening; for storage and mechanical rooms that stay locked at all times, the Accentra 8805FL is a Grade 1 storeroom mortise lock from the 8800 Series with an Arcadia lever, and the Cal-Royal NM8080 is a Grade 1 storeroom mortise lockset for 1-3/4 inch doors offered with an interchangeable core option.
16) Will a Schlage L0170 or Falcon MESC600DT work as a replacement for a Sargent 8259-ET?
No. The Sargent 8259-ET is a keyed heavy duty Grade 1 mortise lock with a working latch. The Schlage L0170 is a half dummy trim, non-keyed dummy function in the L Series, and the Falcon MESC600DT is a dummy escutcheon lever trim for M9900 Series exit devices. Both are pull-only trims with no latching or locking mechanism, so neither secures an opening.
17) Can I use the Sargent 8259-ET on a restroom or office door, or is there a better function?
The Sargent 8259 is a double cylinder School Security function, keyed on both sides, which is not the usual choice for restrooms or offices. For a restroom, the Hager 3840S is a Grade 1 privacy mortise lock with a 2-3/4 inch backset for doors 1-3/4 to 2 inches thick, and the Cal-Royal NM8440 is a Grade 1 privacy mortise lockset with deadbolt for 1-3/4 inch doors. For an office, the Cal-Royal NM8050 is a Grade 1 office/entrance mortise lockset with auxiliary deadlatch.
18) What is the difference between the Sargent 8259-ET and the BEST 45HCAINL intruder function mortise lock?
Both address lockdown. The Sargent 8259-ET is a complete Grade 1 heavy duty double cylinder School Security mortise lock supplied with escutcheon trim in LE1, LS, LW1 or WT and a choice of A, B, E, F, J, L, P or W levers. The BEST 45HCAINL is a heavy duty mortise lockbody with Intruder function in the 40H Series, sold as a lock body, so trim and levers are specified separately.
19) Are the Baldwin 6301 and Marks USA 21AC mortise locks interchangeable with the Sargent 8259-ET?
No. The Sargent 8259-ET is a commercial Grade 1 lock built on a 2-3/4 inch backset for 1-3/4 inch doors. The Baldwin 6301 Entry/Apartment mortise lock body uses a 2-1/2 inch backset, and the Marks USA 21AC Unilock ornamental iron mortise lock is built for 1 inch thick doors. Different backset and door prep mean neither drops into a mortise pocket cut for the 8259.
20) I only need a latching door with no lock at that opening - is the Sargent 8259 overkill?
The Sargent 8259-ET is keyed on both sides for school security lockdown. Where no locking is needed, the Schlage PM010 is a Grade 1 non-keyed passage latch mortise lock for 1-3/4 inch doors, the Falcon MA101 is a Grade 1 heavy duty fire rated mortise passage lock with field reversible operation, and the Hager 3810E is a Grade 1 passage mortise lock with escutcheon and a 2-3/4 inch backset for doors 1-3/4 to 2-1/2 inches thick.
21) Does the Schlage PC10 substitute for the Sargent 8259-ET?
No. The Sargent 8259-ET is a mortise lock that requires a mortise pocket in the door edge. The Schlage PC10 is a Grade 1 passage cylindrical lock with rose for 1-3/4 inch doors, a bored installation and non-keyed, so it neither fits the mortise prep nor provides the keyed school security function.
22) Can I change the function of a Sargent 8200 lock later without buying a new lock body?
The 8200 Series is offered in 56 functions, including electromechanical, security and monitoring versions, and functions can be switched on site. So a body installed today is not a dead end if the room use changes. The 8259 as supplied is the mechanical school security double locking function.
23) Is there an installation template for cutting the door for a Sargent 8200 mortise lock?
Yes. Sargent publishes a 7800 and 8200 Series mortise lock template covering all sectional rose and escutcheon trims, plus the 7800/8200 mortise lock catalog, both available with the product documentation. Use the template to lay out the mortise pocket, cross bores and trim holes before you cut.
How fast can I get the Sargent 8259 LE1A 26D 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 Sargent 8259 LE1A 26D come with a warranty?
Absolutely. The Sargent 8259 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 8259 LE1A 26D?
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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