Sargent 8255-ET Grade 1 Heavy ...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$1,763.82
$1,249.32
Sargent Sargent 8200 Series - (8255) Office or Entry Lock Function Escutcheon Trim, Heavy Duty Single Cylinder Mortise Lock, Grade 1 SGT-8255-ET

Sargent 8255-ET Grade 1 Heavy Duty Single Cylinder Mortise Lock with Office/Entry Function

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Model: 8255 LE1A 26D
From the 8200 Series Collection
$1,763.82
$1,249.32
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Selected Lever is
Selected Escutcheon is

In Stock (leaves warehouse same day if ordered before 3pm ET)

$1,763.82
$1,249.32
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Sargent 8255-ET Grade 1 Heavy Duty Single Cylinder Mortise Lock with Office/Entry Function

Industry Benchmark Mortise Lock with Maximum Security and Performance

The Sargent 8255-ET represents the industry benchmark for commercial mortise locks, delivering maximum security, performance, and durability with high-quality components. This Grade 1 heavy duty single cylinder lock features a 2 3/4" backset, 1 3/4" door thickness compatibility, and 3/4" latchbolt throw for reliable operation. The multi-functional lock body accommodates field reversible handing and 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 secure, reliable operation in commercial applications.
  • Heavy-Duty Durability: Patented design and construction with robust components rated for 16 million cycles per UL Cycle Above and Beyond test (Verification ID: V584148) for exceptional longevity in high-traffic environments.
  • Grade 1 Performance: ANSI/BHMA A156.13 Series 1000 Operational Grade 1 certification ensures maximum security and reliability for demanding commercial applications.
  • Fire Rating Compliance: UL 10C fire-rated up to 3 hours with NFPA 80 compliance for critical fire safety applications in commercial buildings.
  • Universal Key System Integration: Compatible with all SARGENT key systems including Degree, Signature, KESO, and XC for flexible master keying and security management.
  • Field Reversible Design: Handing can be changed on-site for installation flexibility and reduced inventory requirements.
  • Multi-Functional Capability: Available in 56 different functions including electromechanical, security and monitoring options with EcoFlex technology providing up to 89% energy savings.
  • Manufacturer Warranty: 10-year limited warranty with 2-year coverage on electrical components for long-term reliability assurance and added confidence.

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

  • 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 independently verified testing. The 10-year limited warranty with 2-year electrical component coverage provides added confidence for demanding commercial applications. Engineered with multiple certifications including UL 10C 3-hour fire rating and Grade 1 performance standards, this lock represents dependable security performance where maximum durability is essential.

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 LE1A 26D – Frequently Asked Questions

1) Will the Sargent 8255 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 Sargent 8255-ET mortise lock uses a 2-3/4 inch backset and is specified for 1-3/4 inch door thickness. If your existing mortise pocket is cut for a standard commercial 2-3/4 inch backset lock body, this drops into it. Doors thicker or thinner than 1-3/4 inches are outside what this one is specified for.
2) What does the Office/Entry function on the Sargent 8255 actually do at the door?
Office/Entry is the function you want on a suite or tenant door that needs to be left unlocked during business hours and secured after. The outside lever is locked or unlocked by key from the outside, and the inside lever always retracts the latch for free egress. It is a single cylinder lock, so there is a cylinder on the outside only.
3) Do I need to order the Sargent 8255 left hand or right hand?
No handing to specify. The 8255 lock body is field reversible, so the handing is changed on site at install. That is useful for a property manager or contractor stocking a few spares across a building instead of splitting inventory by hand.
4) Can the Sargent 8255 go on a 3-hour fire rated opening?
Yes. The 8255 is UL 10C fire rated up to 3 hours and compliant with NFPA 80, and the 3/4 inch latchbolt throw is what a fire door needs to stay latched under pressure. It carries ANSI/BHMA A156.13 Series 1000 Operational Grade 1 for the security side.
5) What do I have to specify when ordering a Sargent 8255-ET mortise lockset?
Four things. Cylinder: standard cylinder, less cylinder, 70 prep for small format interchangeable core (less core), or 60 prep for large format interchangeable core (less core). Keying: keyed different, keyed alike, or to a key code (pick None if you ordered less cylinder). Lever design: A, B, E, F, J, L, P or W. Escutcheon trim: LE1, LS, LW1 or WT. Then the finish.
6) Can I key the Sargent 8255 into an existing Sargent master key system?
Yes. The 8255 works with all SARGENT key systems, including Degree, Signature, KESO and XC. If you are running interchangeable cores, order the 70 prep for small format or the 60 prep for large format and drop your own cores in. Keyed alike, keyed different and key code orders are all available.
7) Can I use an electronic mortise lock instead of the Sargent 8255-ET for credential access?
The Sargent 8255-ET is a mechanical, non-electronic lock. If you need credentials or codes on the same opening, the Schlage LEMD-GRW is a Grade 1 ENGAGE wireless mortise lock with a 125kHz proximity reader and a 3 hour fire rating, the Dormakaba E-Plex E5086 is a Grade 1 pushbutton and card mortise lock, and the TownSteel FME-2000 is a Grade 1 heavy duty RFID mortise lockset for 1-3/4 inch doors. These require power or battery service that the mechanical 8255-ET does not.
8) What is the closest cross-brand equivalent to the Sargent 8255-ET office/entry mortise lock?
The Cal-Royal NM8050 is the nearest match: it is a Grade 1 heavy duty mortise lockset with an Entrance/Office function and a 1-3/4 inch door thickness rating, the same function and grade the Sargent 8255-ET carries. The Sargent 8255-ET is a single cylinder keyed lever mortise lock in the 8200 Series with escutcheon trim. If the drawing calls out an office/entry mortise lock rather than a Sargent part number specifically, the NM8050 covers the same opening.
9) I need a storeroom function instead of office/entry on this opening - what mortise lock should I use?
Office/entry, which is what the Sargent 8255-ET provides, leaves the lever free to be locked and unlocked from inside. For a door that must stay locked outside at all times, the Accentra 8805FL is a Grade 1 storeroom mortise lock in the 8800 Series, and the Cal-Royal NM8080 is a Grade 1 storeroom mortise lockset with an interchangeable core option for 1-3/4 inch doors.
10) What mortise lock takes the place of the Sargent 8255-ET on a classroom door?
The 8255-ET is an office/entry function and is not a classroom lock. For classroom openings the Corbin Russwin ML2003 is a Grade 1 mortise classroom lockset in the ML2000 Series rated for 1-3/4 inch doors, and the Cal-Royal NM8070 is a Grade 1 classroom mortise lockset with an auxiliary deadlatch for the same door thickness. Marks USA LA318GJ adds a classroom security indicator with an ANSI strike and steel escutcheon.
11) Will a Baldwin 6301 mortise lock body drop into the same prep as the Sargent 8255-ET?
No. The Sargent 8255-ET uses a 2-3/4 inch backset, while the Baldwin 6301 entry/apartment mortise lock body is a 2-1/2 inch backset for 1-3/4 inch and over doors. The Baldwin 6310 entry/storeroom body is also 2-1/2 inch backset. Different backset means different door prep, so these are not interchangeable in an existing 8200 Series pocket.
12) What mortise lock should I use instead of the Sargent 8255-ET on a behavioral health or ligature-resistant opening?
The 8255-ET uses a standard lever with escutcheon trim, which is not ligature resistant. TownSteel MRX-L-01 is a Grade 1 heavy duty anti-ligature lever mortise lockset in stainless steel, MRX-A-01 uses ligature resistant arch trim, and the Marks USA 5PDN is a Grade 1 ligature resistant, ADA compliant hospital passage push/pull paddleset in satin stainless steel.
13) I need the outside lever electrically controlled - what replaces the Sargent 8255-ET?
The 8255-ET is mechanical only. For access control on the same opening, the Schlage L9092EU 03A is a heavy duty electric lock/unlock outside lever mortise lock, keyed outside, with request to exit and 12/24VDC operation, and the Command Access ML190 is a heavy duty motorized mortise lock with field selectable fail safe or fail secure operation on 24VDC and a storeroom function. The BEST 45HW is a heavy duty wired electromechanical mortise lock with 12V/24V operation.
14) Is a Grade 1 mortise lock overkill for a high traffic office corridor?
Not at that traffic level. The 8255 is a heavy duty commercial lock rated for 16 million cycles under the UL Cycle Above and Beyond test (Verification ID V584148), which is well past the ANSI Grade 1 minimum. On an opening cycling hundreds of times a day, a school corridor or a multi-tenant entry, that cycle life is the reason to spend the money.
15) What is the difference between the Sargent 8255 Office/Entry and a storeroom function mortise lock?
Office/Entry lets you unlock the outside lever with the key and leave it unlocked, which is what a tenant suite or office needs during business hours. A storeroom lock keeps the outside lever locked at all times and the key only retracts the latch, so it never stays unlocked. If you need that behavior instead, the Cal-Royal NM8080 and the Accentra 8805FL are Grade 1 storeroom mortise locksets. For a classroom door, the Corbin Russwin ML2003 is the Grade 1 classroom function.
16) What is a comparable Grade 1 office/entrance mortise lockset if I do not need the Sargent key system?
The Cal-Royal NM8050 is a heavy duty Grade 1 Entrance/Office mortise lockset for 1-3/4 inch doors with an auxiliary deadlatch, so it covers the same opening. The reason to stay with the Sargent 8255 is keying: it drops into Degree, Signature, KESO and XC systems, which matters if the rest of the building is already on a Sargent master key.
17) Does the Sargent 8255-ET come with escutcheon trim or do I order plates separately?
Trim is part of the order. The ET designation is escutcheon trim, and you pick the plate style with the lock: LE1, LS, LW1 or WT, paired with one of eight lever designs (A, B, E, F, J, L, P, W) in the finish you select. If your existing doors are prepped for rose trim rather than escutcheon, the escutcheon plate is the larger cover and will usually hide an older prep.
18) I already have cylinders on site. Can I buy the Sargent 8255 without a cylinder?
Yes. Choose the Less Cylinder option and select None for keying, and the lockset ships ready for your own cylinder. For interchangeable core shops, the 70 option is prepped for small format IC less core and the 60 option is prepped for large format IC less core.
19) Is there a non-keyed mortise lock I can use where the Sargent 8255-ET is overkill?
The 8255-ET is a keyed single cylinder lock. Where the door does not need a key, the Hager 3850E is a Grade 1 office mortise lock with lever and escutcheon, non-keyed, on a 2-3/4 inch backset for 1-3/4 inch to 2-1/2 inch doors. For pure passage, the Schlage PM010 is a Grade 1 non-keyed passage latch mortise lock and the Falcon MA101 is a Grade 1 heavy-duty fire-rated mortise passage lock with field reversible operation.
20) What looks like a substitute for the Sargent 8255-ET but is not a working entry lock?
Watch for dummy trim. The Schlage L0170 is a Grade 1 mortise non-keyed half dummy trim, and the Emtek 3102 Memphis, 3104 Hamilton, 3106 Manhattan and 3019 Brisbane mortise entrance locksets are dummy function. They carry no latch operation at all, where the Sargent 8255-ET is a keyed single cylinder office/entry lock with a 3/4 inch latchbolt throw.
21) If I only need the mortise lock body and not the trim, what should I order instead of the Sargent 8255-ET?
The Sargent 8255-ET is supplied as a complete lock with escutcheon trim and a choice of lever style. If the trim is already on the door and you are replacing the body only, the BEST 45H Series is a heavy duty mortise lock body with public entrance function and field reversible operation, and the BEST 45HCA is a heavy duty mortise lockbody with intruder function.
22) Is there a privacy function mortise lock for restrooms where the 8255-ET office/entry function will not work?
Yes. The 8255-ET is a keyed office/entry lock, which is not a restroom function. The Cal-Royal NM8440 is a Grade 1 privacy mortise lockset with deadbolt for 1-3/4 inch doors, and the Hager 3840S is a Grade 1 privacy mortise lock with a 2-3/4 inch backset for 1-3/4 inch to 2 inch doors, matching the 8255-ET backset.
23) Are the keypad mortise locks a like-for-like swap for the Sargent 8255-ET on a 1-3/4 inch door?
Check the door thickness before you commit. The Sargent 8255-ET is specified for 1-3/4 inch doors, while the Alarm Lock Trilogy DL2700CR and DL3500CR Grade 1 electronic mortise locks list a 1-5/8 inch to 1-7/8 inch door range and both are classroom function rather than office/entry. The Schlage CO-100 mortise is Grade 1 heavy duty for 1-3/4 inch doors but is a privacy function with keypad reader.
24) What finishes does the Sargent 8200 Series office lock come in, and can I match existing brass hardware?
Sixteen finishes, so most existing hardware can be matched: 03 bright brass and 04 satin brass clear coated, 09 bright bronze and 10 satin bronze, 10B oil rubbed dark oxidized satin bronze, 10BE, 10BL, 14 bright nickel, 15 satin nickel, 20D dark statuary bronze lacquered, 26 bright chrome and 26D satin chrome over nickel, 32 bright and 32D satin stainless, plus BSP black and WSP white suede powder coat. 26D and 32D are the usual commercial defaults.
How fast can I get the Sargent 8255 LE1A 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 LE1A 26D come with a warranty?
Absolutely. The Sargent 8255 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 8255 LE1A 26D?
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