Name: Sargent 8255 Office Entry Function Heavy Duty Grade 1 Mortise Lock with EcoFlex Technology
Brand: Sargent
SKU: 8255 LNA 26D
Price: 1013.51 USD
Availability: InStock

Product Overview
FAQs

Sargent 8255 Grade 1 Heavy Duty Mortise Lock with EcoFlex Technology

Industry Benchmark Mortise Lock with Maximum Security and Performance

The Sargent 8255 represents the industry benchmark for mortise locks, delivering maximum security, performance, and durability through high-quality components and patented design. This Grade 1 heavy duty mortise lock features a 2 3/4" backset, 3/4" latchbolt throw, and field reversible handing for 1 3/4" door thickness applications. The electromechanical version operates from 12 to 24VDC with revolutionary EcoFlex technology that reduces power consumption up to 96%, while UL testing verification shows exceptional durability at 16 million cycles.

Professional Features & Benefits

Door Specifications: Designed for 1 3/4" door thickness with standard 2 3/4" backset and 3/4" latchbolt throw for reliable latching performance.
Ultra-High Cycle Rating: UL Cycle Above and Beyond test completed at 16 million cycles (Verification ID: V584148) for exceptional long-term reliability in high-traffic commercial applications.
Flexible Power Options: 12 to 24VDC operation with revolutionary EcoFlex technology that reduces power consumption up to 96% while maintaining full operational capability.
Heavy-Duty Construction: Patented design and construction with robust components engineered to far exceed independently verified testing standards.
Universal Key System Integration: Integrates seamlessly with all SARGENT key systems including Degree, Signature, KESO, and XC for comprehensive access control flexibility.
Multi-Functional Design: Available in 56 different functions including electromechanical, security and monitoring options with on-site function switching capability.
Comprehensive Fire Rating: UL 10C Fire-Rated up to 3 hours with positive pressure certification for critical fire safety applications.
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

Verify electrical requirements match available power supply. Confirm voltage (12 to 24VDC) and current capacity before proceeding.
Disconnect power supply before beginning installation. Follow all applicable electrical codes and safety procedures.
Mount the unit in the specified location ensuring adequate clearance for wiring access, ventilation, and future service requirements.
Route and connect wiring according to manufacturer wiring diagrams. Use appropriate wire gauge and connectors for the application.
Configure operational settings including any configurable options per application requirements.
Restore power and test all functions including normal operation, alarm/alert functions, and integration with connected systems.
Complete final inspection and document settings. Refer to manufacturer documentation for complete wiring diagrams, programming instructions, 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

EcoFlex Energy Technology

Revolutionary power management creates up to 89% energy savings on electromechanical functions while maintaining full operational capability. This advanced technology reduces power consumption up to 96% compared to traditional electromechanical mortise locks, making it ideal for sustainable building applications and reducing operational costs.

Why Choose Sargent Quality?

Sargent 8255 mortise locks deliver professional-grade reliability with patented design and construction rated for 16 million cycles through rigorous UL testing verification. The comprehensive 10-year limited warranty on mechanical components and 2-year electrical coverage demonstrates the manufacturer's confidence in long-term performance. Engineered for demanding commercial applications where dependable performance and energy efficiency are essential, with Grade 1 ANSI/BHMA certification and extensive fire safety approvals.

Manufacturer Resources

SARGENT Full Line Catalog

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:: Office/Entry
Product Type:: Mortise Locks
Duty Level:: Heavy Duty
Handle Type:: Lever
Product Attribute:: Mortise Locks
Electronic:: No
Product Function:: Entrance/Office
Product Category:: Mechanical Locks
Collection:: 8200 Series
Department:: Door Hardware

Sargent 8255 LNA 26D – Frequently Asked Questions

1) Does the Sargent 8255 need to be ordered handed, or is it field reversible?

Handing is set in the field. The 8255 lock body is field reversible, so one part number covers left and right hand openings and you can flip it on site rather than returning a wrong-hand lock.

2) What does office/entry function mean on a Sargent 8255, and is it the right function for a tenant suite door?

Office/entry means the outside lever can be locked and unlocked, typically by the inside thumbturn or button, and the key retracts the latch from outside. That is the function for a suite or office door somebody locks behind them at the end of the day and props unlocked during business hours. If you want a door that stays locked outside at all times and is only opened by key, spec a storeroom function instead, such as the Cal-Royal NM8080. For a classroom door locked from outside by key only, the Corbin Russwin ML2003 covers that.

3) Will the Sargent 8255 latch into the existing ANSI strike already in my frame?

The 8255 throws a 3/4 inch latchbolt at a 2-3/4 inch backset. On a standard commercial frame with an ANSI strike and the same 2-3/4 backset prep, it latches without reworking the frame. If the frame was prepped for a 2-3/8 inch backset bored lock, that is a different prep entirely and the mortise pocket will not line up.

4) Is the Sargent 8255 fire rated for a 3 hour opening?

UL 10C fire rated up to 3 hours, with positive pressure certification. That covers the stair and corridor openings in most commercial buildings. It is also ANSI/BHMA Grade 1, heavy duty, and UL tested past 16 million cycles under the Cycle Above and Beyond program (Verification ID V584148).

5) What do I have to specify when ordering a Sargent 8255 mortise lock?

Four choices settle the order. Cylinder: standard cylinder, less cylinder, 70 prep for small format interchangeable core less core, or 60 prep for large format IC less core. Keying: keyed different, keyed alike, or to a key code (pick none if you chose less cylinder). Then the trim, which is one of eight lever designs (A, B, E, F, J, L, P, W) and one of four roses, and finally the finish. Get the cylinder and keying wrong and the lock arrives without a way to key it into your system.

6) Can I get the Sargent 8255 keyed into my existing building master key system?

Yes. The 8255 is a single cylinder keyed lock and works with all Sargent key systems, including Degree, Signature, KESO and XC. If your facility is already on one of those, order it keyed alike or to your key code so it drops into the existing hierarchy. If you key your own, order it with the 60 large format or 70 small format interchangeable core prep, less core, and install your own cores.

7) Is the Sargent 8255 an electronic lock, or is it mechanical?

Mechanical. The 8255 as ordered here is a keyed mechanical mortise lock with lever trim, no wiring and no power supply needed. Sargent's electromechanical versions of the 8200 body run 12 to 24VDC with EcoFlex power management, but that is a different configuration. If you need an electrified mortise lock for access control, look at the BEST 45HW wired electromechanical mortise lock with 12V/24V operation or the Command Access ML190 with field selectable EL/EU and 24VDC.

8) What else could I buy instead of the Sargent 8255 for a Grade 1 office entry mortise lock?

The closest straight swap is the Cal-Royal NM8050, a Grade 1 heavy duty office/entrance mortise lockset with auxiliary deadlatch for 1-3/4 inch doors, the same function and door thickness. Baldwin's 6301 is another entrance/apartment mortise body but runs a 2-1/2 inch backset rather than 2-3/4, so it needs a different frame prep. Hager's 3850E is an office mortise lock at a 2-3/4 inch backset, but it is non-keyed, so it will not serve if you need key access from outside.

9) What is the closest cross-brand equivalent to a Sargent 8255 office/entry mortise lock?

The Cal-Royal NM8050 is the nearest match: it is a heavy duty Grade 1 mortise lockset with an Entrance/Office function, the same function the Sargent 8255 carries, and it is built for 1-3/4 inch doors, which is the thickness the 8255 is designed around. Both are lever-operated keyed mortise locks for commercial openings. The NM8050 uses an auxiliary deadlatch in its latch design. Where the 8255 differs is the key system side - it works with Sargent Degree, Signature, KESO and XC key systems, so a facility already standardized on Sargent keyways stays inside its system with the 8255.

10) What Grade 1 mortise lock should I use if the door needs to stay locked at all times instead of office function?

For an always-locked opening, the Cal-Royal NM8080 is a heavy duty Grade 1 storeroom mortise lockset for 1-3/4 inch doors with an interchangeable core option, and the Accentra 8805FL is a Grade 1 storeroom mortise lock from the 8800 Series supplied with an Arcadia lever. Storeroom function keeps the outside lever locked and requires the key on every entry, where the Sargent 8255 office/entry function allows the outside lever to be left unlocked for the working day.

11) Which mortise lock replaces an office lock on a classroom door?

Classroom function is a different lock. The Cal-Royal NM8070 is a heavy duty Grade 1 classroom mortise lockset for 1-3/4 inch doors with an auxiliary deadlatch, and the Corbin Russwin ML2003 is a Grade 1 mortise classroom lockset in the ML2000 Series, also for 1-3/4 inch doors. Both suit a teaching space where the outside lever is keyed locked and unlocked from the corridor side, rather than the Entrance/Office function the Sargent 8255 carries.

12) What is the difference between a Sargent 8255 and a Baldwin 6301 mortise lock body?

They are not interchangeable in the door prep. The Baldwin 6301 is an entrance/apartment mortise lock body on a 2-1/2 inch backset, offered knob by knob or as the 6301LS lever by lever, for doors 1-3/4 inch and over. The Sargent 8255 uses a 2-3/4 inch backset with a 3/4 inch latchbolt throw and a lever handle. A 2-1/2 inch backset body will not drop into a pocket cut for a 2-3/4 inch backset, so confirm the existing prep before swapping either direction.

13) What is a comparable electrified mortise lock to the Sargent 8255 electromechanical version?

The BEST 45HW Series is a wired electromechanical heavy duty mortise lock with 12V/24V operation, the Command Access ML190 is a heavy-duty motorized mortise lock in storeroom function with field selectable EL/EU operation on 24VDC, and the Schlage L9092EU with 03A trim is a heavy duty electric lock/unlock outside lever mortise lock, keyed outside, with request to exit at 12/24VDC for 1-3/4 inch doors. The electromechanical Sargent 8255 also runs 12 to 24VDC and adds EcoFlex power management that cuts consumption up to 96 percent against traditional electromechanical mortise locks - a difference that matters when sizing a power supply across many openings.

14) What mortise lock fits an aluminum storefront or glass door where a standard mortise lockset will not?

Narrow stile aluminum and glass openings take a different family of hardware. The Alarm Lock DL1300NW is a Trilogy Networx wireless electronic mortise lock with keypad built for Adams Rite deadlatches, the Dormakaba E-Plex 2066 is an electronic pushbutton keyless mortise lock in a wide stile configuration, and the Kaba Ilco BR Series is a glass door bottom rail lock. The Sargent 8255 is built for a 1-3/4 inch door with a full mortise pocket, which a narrow aluminum stile cannot accept.

15) What is the difference between the Sargent 8255 and the Accentra 8805FL for a commercial entry?

Both are Grade 1 mortise locks, but the function differs and that decides the door. The Accentra 8805FL is a storeroom function lock in the 8800 Series with an Arcadia lever - the outside lever stays locked and every entry needs a key. The Sargent 8255 is office/entry function, keyed single cylinder, so the outside lever can be left unlocked while the space is occupied and secured at the end of the day. Choose by whether staff need the door to stay free during business hours.

16) Is the Schlage LE Series mortise lock the same grade as the Sargent 8255?

No. The Schlage Electronics LEBMB-ADD mobile-enabled mortise lock with push button and LED, covering privacy, office and apartment functions, is Grade 2 with a 3 hour fire rating for 1-3/4 inch doors. The Sargent 8255 is Grade 1 heavy duty and UL 10C fire-rated up to 3 hours with positive pressure certification. If the specification calls out ANSI/BHMA Grade 1, the LE Series will not meet it.

17) Which rose size do I need for a Sargent 8255, and how big is each one?

Four rose sizes are offered on the 8255: LN rose at 2 inches (51mm), O rose at 2-3/4 inches (67mm), E rose at 3-1/16 inches (78mm), and L rose at 3-1/2 inches (89mm). Pick by what you need to cover. If you are replacing an older lock that left a larger scar in the door face, the L or E rose hides more of it; the LN is the smallest and shows the most door.

18) Should I use a mortise lock like the Sargent 8255 or a cylindrical lockset on my office doors?

A mortise lock goes in a rectangular pocket cut into the door edge and carries more hardware in one body, which is why it takes heavy commercial traffic. A cylindrical lock goes through two round bores and is quicker to install but is a lighter assembly. The deciding factor is usually the door you already have: a door prepped for a mortise pocket takes the 8255, and a door with round bores does not without new prep. For a bored opening, something like the Schlage PC Series cylindrical lock is the correct family.

19) Is the Sargent 8255 heavy duty enough for a high traffic entrance in a school or hospital?

Yes. Grade 1, heavy duty, and UL tested to 16 million cycles, which is well past what a standard Grade 1 cycle test requires. That is the durability class you want on a main entrance, a corridor door, or a patient wing door that swings all day. It carries lever trim, which is what most facility codes call for on accessible openings.

20) Can I order the Sargent 8255 without a cylinder so I can use my own cores?

Three ways to take it less the cylinder. Order it plain less cylinder, or order the 70 prep for small format interchangeable core less core, or the 60 prep for large format interchangeable core less core. Whichever you pick, set keying to none. Locksmiths standardizing a site on their own core stock normally take the 60 or 70 prep so the body is already machined for the core they carry.

21) Can I use a mortise lock like the Sargent 8255 on a door thinner than 1-3/4 inch?

The Sargent 8255 is built for 1-3/4 inch door thickness. For thinner or narrower openings the peer set points elsewhere: the Alarm Lock DL2700CR covers 1-5/8 to 1-7/8 inch doors in classroom function, and the Marks USA 21AC and 22AC entrance double cylinder ornamental iron mortise locks are made for 1 inch doors, which is typical of hollow metal and ironwork gates rather than a standard commercial leaf. Measure the leaf before ordering, since the lock case depth is fixed by the door.

22) I do not need a keyed lock on this door - what mortise lock takes the place of an 8255?

The Sargent 8255 is a keyed single cylinder lock, so on a non-keyed opening a passage or privacy body is the right part instead. The Falcon MA101 is a Grade 1 heavy-duty mortise passage lock in the MA Series with field reversible operation and a fire rating; the Schlage PM010 is a Grade 1 passage latch mortise lock, non-keyed, for 1-3/4 inch doors. For a restroom or bedroom that needs to lock from inside only, the Cal-Royal NM8440 is a heavy duty Grade 1 privacy mortise lockset with a deadbolt for 1-3/4 inch doors.

23) Is a Schlage L0170 a substitute for a Sargent 8255?

No. The Schlage L0170 is half dummy trim - a Grade 1 heavy duty non-keyed mortise lever for 1-3/4 inch doors with a dummy function, meaning the lever is fixed and there is no latch or cylinder behind it. The Emtek 3019 Brisbane, 3102 Memphis, 3104 Hamilton and 3106 Manhattan mortise entrance locksets are likewise dummy function. The Sargent 8255 is a keyed single cylinder working lock with a latchbolt. Use a dummy only on an inactive leaf.

24) What mortise lock should I specify if the opening needs a keypad instead of a key?

For credential entry rather than a mechanical key, the Alarm Lock DL3500CR is a Grade 1 Trilogy electronic mortise lock with 300 user codes and classroom function for 1-5/8 to 1-7/8 inch doors, the Schlage CO-100 is a Grade 1 heavy duty standalone electronic mortise lock with a keypad reader in privacy function for 1-3/4 inch doors, and the BEST 45HZ EZ Series is an electronic keypad mortise lock with key override. The Sargent 8255 is a mechanical keyed lock, so keypad access means changing the lock body and not just the trim.

25) Which mortise lock works with a card reader or wireless access control system?

For credentialed and networked openings, the TownSteel FME-2000 is a Grade 1 heavy duty mortise lockset with RFID technology in classroom function for 1-3/4 inch doors, the Schlage LEMD-GRW is a Grade 1 ENGAGE Series wireless mortise lock with a 125kHz proximity reader and a 3 hour fire rating, and the Dormakaba Saffire LX-I-M002 is an electronic RFID mortise lockset with BLE mobile access at BHMA Grade 2. The Sargent 8255 is a mechanical lock and reads no credential; its electromechanical version operates from 12 to 24VDC and is switched by an access system rather than reading cards itself.

26) What mortise lock should I use on a behavioral health or ligature-resistant opening instead of a standard lever lock?

Standard lever trim is the wrong trim for those rooms. The TownSteel MRX-L-01 is a Grade 1 heavy duty anti-ligature lever mortise lockset in stainless steel, 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/pull paddleset, ligature resistant and ADA compliant in satin stainless steel. The Sargent 8255 uses a conventional lever, offered in eight lever designs.

27) Is a cylindrical lock an acceptable substitute for a mortise lock?

Not without changing the door prep. The Schlage PC10 is a Grade 1 passage cylindrical lock with rose for 1-3/4 inch doors - a cylindrical body fits a bored hole, while the Sargent 8255 is a mortise lock that needs a rectangular pocket cut into the door edge. Swapping a mortise lock for a cylindrical one leaves the pocket exposed and usually requires a filler plate or a new door.

28) What lock body do I order if I only need the mortise case and will reuse the existing trim?

Lock bodies are sold on their own: the BEST 45HCAC is a heavy duty mortise lock body in public entrance function with field reversible operation, and the 45HCAINL is a heavy duty mortise lockbody with intruder function. The Sargent 8255 is a complete lockset - the order combines a lever from eight designs and a rose in E at 3-1/16 inch, L at 3-1/2 inch, LN at 2 inch, or O at 2-3/4 inch - so it is the choice when trim is being replaced along with the case.

29) Which Grade 1 office mortise lock can I use if the door is thicker than 1-3/4 inch?

The Hager 3850E is a Grade 1 office mortise lock with lever and escutcheon, non-keyed, on a 2-3/4 inch backset and rated for doors from 1-3/4 inch to 2-1/2 inch. It shares the 2-3/4 inch backset the Sargent 8255 uses, so the pocket location matches, but it is non-keyed where the 8255 is a keyed single cylinder lock. If the thicker door also needs to be keyed, confirm the thickness against the specific model before ordering.

30) Is the Alarm Lock DL4500 a substitute for a Sargent 8255 on an office door?

No - the DL4500 is a Grade 1 electronic mortise deadbolt with 2,000 user codes and a privacy keypad for 1-5/8 to 1-7/8 inch doors. Its function is deadbolt, so it throws a bolt but provides no latching lever for normal traffic. The Sargent 8255 is an office/entry lockset with a 3/4 inch latchbolt throw and lever operation. A deadbolt-only body on an office door leaves nothing to keep the door closed between locks.

31) What mortise lock should I use for a classroom that needs to be locked from inside during a lockdown?

The TownSteel FME-4000 is an electronic intruder classroom mortise lockset with RFID technology, Grade 1 heavy duty for 1-3/4 inch doors, and the BEST 45HCAINL is a heavy duty mortise lockbody with intruder function. Intruder function lets the door be secured from the inside without stepping into the corridor. The Sargent 8255 is office/entry function, which locks the outside lever by key or by the inside control depending on how the opening is set up, but it is not an intruder-function lock.

32) Which mortise lock is right for an apartment entry door rather than an office?

For a residential unit entry, the Baldwin 6301 is an entrance/apartment mortise lock body offered knob by knob, with the 6301LS as the lever by lever version, both on a 2-1/2 inch backset for doors 1-3/4 inch and over. The Baldwin 6310 is entrance/storeroom function on the same 2-1/2 inch backset for doors 1-3/8 inch and over, with the 6310190RRLS as a right hand reverse lever configuration. The Sargent 8255 is an office/entry function lock on a 2-3/4 inch backset, aimed at commercial traffic.

33) Is the Codelocks CL2255 a lighter-duty alternative to a Grade 1 mortise lock?

The Codelocks CL2255 is a medium duty electronic tubular mortise latch in the CL2000 Series, supplied in a brushed steel finish. Medium duty suits a lower-traffic interior door such as a storage or staff room. The Sargent 8255 is heavy duty Grade 1 and UL tested to 16 million cycles, which is the specification a main corridor or high-traffic entry calls for.

34) Which mortise lock should I use on a restroom that also needs a deadbolt?

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. Privacy function locks from inside without a key on the outside, which is what a restroom or changing room needs. The Sargent 8255 is a keyed office/entry lock and is not a privacy lock.

35) What are my options if I want a keypad mortise lock but still need a mechanical key override?

The BEST 45HZ EZ Series is an electronic keypad mortise lock with key override function, and the Accentra NTM623-NR nexTouch Generation 3 is a Grade 1 mortise lock with a capacitive touchscreen keypad, no deadbolt, with cylinder override. Both keep a mechanical cylinder as a fallback. The Sargent 8255 is keyed only, but it integrates with all Sargent key systems including Degree, Signature, KESO and XC, so a keypad lock with override still has to accept a cylinder that matches the site keyway.

36) What finishes does the Sargent 8255 mortise lock come in for matching the rest of my building?

Sixteen finishes are available on the 8255, covering the common commercial ones (26D satin chrome, 32D satin stainless, 15 satin nickel, 10B oil rubbed bronze) plus bright brass 03, satin brass 04, bright bronze 09, satin bronze 10, 10BE and 10BL dark oxidized bronzes, 14 bright nickel, 20D dark statuary bronze, 26 bright chrome, 32 bright stainless, and black or white suede powder coat. For a fleet of doors, matching on the numeric code rather than the finish name is the reliable way to keep openings consistent.

37) Do the Sargent 8255 finish options match what other commercial mortise locks offer?

The Sargent 8255 covers 16 finishes, from 26D satin chromium plated over nickel and 32D satin stainless steel through 10B dark oxidized satin bronze oil rubbed, 04 satin brass, 15 satin nickel, and BSP black and WSP white suede powder coat. Peers in the same class are supplied in fixed finishes - the Marks USA 5PDN paddleset and the TownSteel MRX-A-01 are satin stainless steel. If a facility is matching existing hardware across many doors, the 8255 finish range is the wider starting point.

38) What is a comparable mortise lock for a paired entry door where both sides need credential control?

The Dormakaba E-Plex E5086 is a Grade 1 entry/egress electronic pushbutton and card lock in a back to back mortise configuration, meaning credential entry is available from either side. The Dormakaba PowerPlex P2066 is a mortise lock in the PowerPlex 2000 Series. The Sargent 8255 is a keyed single cylinder lock, so control on the second side comes from the key system rather than a reader.

39) Do I need a separate deadbolt alongside a Sargent 8255?

Not for the latching function - the 8255 is a keyed single cylinder office/entry lockset with a 3/4 inch latchbolt throw. Where a project does call for a separate mortise deadbolt, the Kaba Ilco 185 Series is a deadbolt function mortise lock supplied with no handing in a single pack. Adding a deadbolt above the lockset requires a second pocket in the door edge and, on a fire-rated opening, confirmation that the assembly still complies.

40) Which passage mortise lock uses an escutcheon instead of a rose?

The Hager 3810E is a Grade 1 passage mortise lock with escutcheon on a 2-3/4 inch backset for doors 1-3/4 inch to 2-1/2 inch, and the 3810S is the same passage lock supplied with a rose instead. The Sargent 8255 is a rose trim lock, offered in E rose at 3-1/16 inch, L rose at 3-1/2 inch, LN rose at 2 inch and O rose at 2-3/4 inch. Escutcheon trim covers more of the door face, which matters when replacing hardware that leaves marks or holes behind.

How fast can I get the Sargent 8255 LNA 26D delivered?

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Can I return it if it doesn’t work for me?

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Does the Sargent 8255 LNA 26D come with a warranty?

Absolutely. The Sargent 8255 LNA 26D is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.

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Sargent 8255 Office Entry Function Heavy Duty Grade 1 Mortise Lock with EcoFlex Technology

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