Sargent 8259 School Security D...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$1,854.84
$1,243.74
Sargent Sargent 8200 Series - (8259) School Security/Double Locking Function Rose Trim, Heavy Duty Double Cylinder no Deadbolt Mortise Lock, Grade 1 SGT-8259

Sargent 8259 School Security Double Locking Function Heavy Duty Grade 1 Mortise Lock with Rose Trim

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Model: 8259 EA 26D
From the 8200 Series Collection
$1,854.84
$1,243.74
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$1,854.84
$1,243.74
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Sargent 8259 School Security Double Locking Function Grade 1 Mortise Lock with 2 3/4" Backset

Professional Grade 1 Mortise Lock Solution

The Sargent 8259 mortise lock delivers maximum security, performance, and durability with heavy-duty Grade 1 construction for demanding commercial applications. This professional-grade lever-style mortise lock features a 2 3/4" backset, 1 3/4" door thickness compatibility, and 3/4" latchbolt throw for reliable operation. UL tested to 16 million cycles with Grade 1 operational rating, this lock integrates with all SARGENT key systems including Degree, Signature, KESO, and XC for flexible master keying options.

Professional Features & Benefits

  • Heavy-Duty Durability: UL Cycle Above and Beyond test completed at 16 million cycles (Verification ID: V584148) for exceptional long-term reliability in high-traffic applications.
  • Grade 1 Performance: ANSI/BHMA A156.13 Series 1000 Operational Grade 1 certification ensures maximum security and performance standards.
  • Standard Door Compatibility: 2 3/4" backset depth and 1 3/4" door thickness accommodate standard commercial door preparations with 3/4" latchbolt throw.
  • EcoFlex Technology: Electromechanical version operates from 12 to 24VDC with EcoFlex technology reducing power consumption up to 96% for energy-efficient operation.
  • Universal Key System Integration: Compatible with all SARGENT key systems (Degree, Signature, KESO, and XC) for flexible master keying options and system integration.
  • Multi-Functional Design: Available in 56 different functions including electromechanical, security and monitoring configurations with field-reversible handing.
  • Fire-Rated Construction: UL 10C Fire-Rated up to 3 hours with NFPA 80 compliance for life safety applications and code requirements.
  • Comprehensive 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. Verify electrical requirements match available power supply. Confirm voltage (12 to 24VDC for electromechanical version) and current capacity before proceeding.
  2. Disconnect power supply before beginning installation. Follow all applicable electrical codes and safety procedures.
  3. Mount the unit in the specified location ensuring adequate clearance for wiring access, ventilation, and future service requirements.
  4. Route and connect wiring according to manufacturer wiring diagrams. Use appropriate wire gauge and connectors for the application.
  5. Configure operational settings including field-reversible handing and any configurable options per application requirements.
  6. Restore power and test all functions including normal operation, locking mechanisms, and integration with connected systems.
  7. Complete final inspection and document settings. Refer to manufacturer documentation for complete wiring diagrams, programming instructions, and troubleshooting.

Professional Applications

  • Educational Facilities and School Security Systems
  • 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 independently verified testing. With comprehensive fire ratings up to 3 hours, Grade 1 operational certification, and a 10-year limited warranty with 2-year electrical coverage, these locks are engineered for demanding commercial applications where dependable performance and maximum security 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 EA 26D – Frequently Asked Questions

1) What does the Sargent 8259 school security function actually do on a classroom door?
The 8259 is a double locking, double cylinder function: a key is required on both sides to lock and unlock the outside lever, and there is no deadbolt in the lock body. Teachers or staff lock the door from inside the classroom with a key rather than stepping into the corridor, which is the whole point of the school security arrangement. Both levers still retract the latch for egress once unlocked, and the lock takes a cylinder on each side, so plan for two cylinders per opening.
2) Will the Sargent 8259 mortise lock fit a standard 1-3/4 inch commercial door?
Yes. The 8259 is specified for 1-3/4 inch door thickness with a 2-3/4 inch backset, which is the standard commercial mortise prep. Handing is field reversible, so one lock covers left or right hand openings without a special order.
3) Will the 8259 latch into the existing ANSI mortise strike already in my frame?
The 8259 throws a 3/4 inch latchbolt from a 2-3/4 inch backset mortise case, which is the standard commercial pocket and strike geometry. If your frame is already prepped for an ANSI mortise lock at 2-3/4 inch backset, the existing strike normally accepts it. Since there is no deadbolt in this function, you only need the latch cutout, not a deadbolt pocket in the strike.
4) Can the Sargent 8259 be used on a fire rated classroom door?
Yes. The 8200 Series mortise lock is UL 10C fire rated up to 3 hours with NFPA 80 compliance, and it carries ANSI/BHMA A156.13 Series 1000 Operational Grade 1. The latch-only construction with no deadbolt suits fire door openings where positive latching and free egress are required.
5) What do I have to specify when ordering a Sargent 8259, besides the finish?
Four choices decide the part. Cylinder: standard cylinder, less cylinder, 70 prep for a small format interchangeable core less core, or 60 prep for a large format IC less core. Keying: keyed different, keyed alike, or a specific key code (select none if you ordered less cylinder). Lever style: A, B, E, F, J, L, P or W. Rose: LN at 2 inches, O at 2-3/4 inches, E at 3-1/16 inches, or L at 3-1/2 inches. Remember this is a double cylinder function, so cylinder count is two per lock.
6) Can I key the 8259 into the master key system already running in my school?
If the building is on Sargent, yes. The 8259 works with all SARGENT key systems including Degree, Signature, KESO and XC. It can also be ordered with a 70 prep for small format interchangeable cores or a 60 prep for large format IC, both less core, so you can drop in the cores your existing system already uses.
7) If we want keypad or credential access on the same school door instead of the Sargent 8259, what mortise locks cover that?
The 8259 is a mechanical, non-electronic keyed mortise lock. For credential-based access on a mortise prep, the Alarm Lock DL3500CR is a Grade 1 Trilogy electronic mortise lock with classroom function and 300 user codes for 1-5/8 to 1-7/8 inch doors, the Schlage CO-100-MS is a Grade 1 standalone keypad mortise lock for 1-3/4 inch doors, and the TownSteel FME-2000 is a Grade 1 classroom mortise lockset with RFID for 1-3/4 inch doors.
8) What is the closest Grade 1 mortise alternative to the Sargent 8259 for a classroom door that only needs key control from the corridor side?
The Sargent 8259 is a double cylinder school security function, meaning it is keyed on both sides of the door. If the opening only needs key control from the corridor, 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 with auxiliary deadlatch, also for 1-3/4 inch doors. Both are single-cylinder classroom function rather than the 8259's double cylinder arrangement.
9) Which mortise lock should I use instead of the Sargent 8259 if the school wants an intruder function that locks the door from inside the classroom?
The Sargent 8259 is a mechanical school security/double locking lock keyed on both sides, so inside locking is done with a key. For a dedicated intruder function lockbody, the BEST 45HCA heavy duty mortise lockbody is offered with an Intruder function, and the TownSteel FME-4000 is a Grade 1 electronic intruder classroom mortise lockset with RFID for 1-3/4 inch doors.
10) What should I specify instead of the Sargent 8259 if the access control system needs to lock and unlock the lever electrically?
The 8259 is a mechanical lock with no electrical function. For an electrically controlled mortise body, the Schlage L9092EU 03A is a heavy duty mortise lock that electrically locks and unlocks the outside lever with keyed outside and request-to-exit, on 12/24VDC for 1-3/4 inch doors; the Command Access ML190 is a heavy-duty motorized storeroom mortise lock with field selectable EL/EU operation at 24VDC; and the BEST 45HW is a heavy duty wired electromechanical mortise lock with 12V/24V operation.
11) Is the 8259 durable enough for a high traffic school corridor?
It is built as heavy duty Grade 1 and completed the UL Cycle Above and Beyond test at 16 million cycles (Verification ID V584148). For a classroom or corridor door being worked several hundred times a day, that is the top commercial tier of cycle testing.
12) Is the Sargent 8259 an electronic lock, and does it need wiring?
No. The 8259 with rose trim is a purely mechanical, key operated mortise lock, so there is no power supply, transformer or wiring to run. If you need an electrified opening for access control, look at a wired electromechanical mortise lock such as the BEST 45HW, which runs on 12V or 24V, or the Command Access ML190 motorized mortise lock with field selectable EL/EU operation at 24VDC.
13) Does the Sargent 8259 include a deadbolt for after-hours security?
No. The 8259 is a double cylinder function with no deadbolt, latchbolt only with a 3/4 inch throw. If the opening needs a deadbolt as well, you need a different function in the 8200 Series or a separate deadbolt, not this one.
14) Is the Accentra 8805FL a substitute for the Sargent 8259?
They are both Grade 1 mortise locks but not the same function. The Accentra 8805FL is a storeroom function, where the outside lever is always locked and key retracts the latch. The Sargent 8259 is a double cylinder school security/double locking function keyed on both sides. Cal-Royal's NM8080 is another Grade 1 storeroom mortise option for 1-3/4 inch doors if storeroom is what the opening actually calls for.
15) We do not need a keyed lock on every classroom door - what non-keyed mortise locks pair with the Sargent 8259 on the same job?
The Sargent 8259 is keyed on both sides, so for passage and privacy openings in the same building use a non-keyed body. The Schlage PM010 is a Grade 1 non-keyed passage latch mortise lock for 1-3/4 inch doors, the Hager 3810S is a Grade 1 passage mortise lock with rose and 2-3/4 inch backset for 1-3/4 to 2-1/2 inch doors, and the Hager 3840S is a Grade 1 privacy mortise lock with 2-3/4 inch backset. All will match the 8259's 2-3/4 inch backset prep.
16) Does the Sargent 8259 include a deadbolt, and what mortise lock do I use if I need one?
No - the 8259 is a double cylinder school security/double locking mortise lock without a deadbolt. If the opening needs a mortise deadbolt, the Kaba Ilco 185 Series is a deadbolt function mortise lock with no handing, and the Cal-Royal NM8440 is a Grade 1 privacy mortise lockset with deadbolt for 1-3/4 inch doors. The Alarm Lock DL4500 is a Grade 1 electronic mortise deadbolt with privacy keypad for 1-5/8 to 1-7/8 inch doors.
17) Can I use a Baldwin 6301 or 6310 mortise lock body in place of a Sargent 8259?
Not on the same prep. The Baldwin 6301 entry/apartment and 6310 entry/storeroom mortise bodies are 2-1/2 inch backset, while the Sargent 8259 is a 2-3/4 inch backset mortise lock, so the lock case and cylinder locations differ. The Baldwin bodies are also entry/apartment and entry/storeroom functions rather than the 8259's double cylinder school security function.
18) For a behavioral health wing in the same school, is the Sargent 8259 the right mortise lock?
The 8259 is a lever-handle mortise lock with rose trim and is not an anti-ligature design. For ligature-resistant openings, TownSteel offers the MRX-L-01 Grade 1 heavy duty anti-ligature lever mortise lockset and the MRX-A-01 ligature resistant arch trim mortise lockset, both passage function for 1-3/4 inch doors, and Marks USA offers the 5PDN Grade 1 hospital passage mortise push/pull paddleset that is ligature resistant and ADA compliant.
19) What are the finish options on the Sargent 8259, and can I match the other doors in the building?
Sixteen finishes are offered: 03 bright brass, 04 satin brass, 09 bright bronze, 10 satin bronze, 10B oil rubbed dark oxidized satin bronze, 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. 26D and 32D are the usual matches for existing school and institutional hardware.
20) Which rose size should I order for the 8259 to cover the old trim marks on the door?
Four sectional roses are available: LN at 2 inches (51mm), O at 2-3/4 inches (67mm), E at 3-1/16 inches (78mm) and L at 3-1/2 inches (89mm). Pick the larger E or L rose where you are replacing escutcheon trim or need to hide wear rings and old fastener holes; LN is the compact option for clean doors or tighter trim conditions.
21) Is a Schlage L0170 an alternative to the Sargent 8259 for an inactive leaf?
They do different jobs. The Schlage L0170 is a Grade 1 heavy duty half dummy trim for 1-3/4 inch doors with no latch or key function, used for pull-only leaves. The Sargent 8259 is a working double cylinder school security mortise lock with a 3/4 inch latchbolt throw. Use the dummy trim only where no latching is required.
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Can I return it if it doesn’t work for me?
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Does the Sargent 8259 EA 26D come with a warranty?
Absolutely. The Sargent 8259 EA 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 EA 26D?
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