Sargent 8231-ET Heavy Duty Sin...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$1,799.49
$1,283.51
Sargent Sargent 8200 Series - (8231) Utility Lock Function Escutcheon Trim, Heavy Duty Single Cylinder Mortise Lock, Grade 1 SGT-8231-ET

Sargent 8231-ET Heavy Duty Single Cylinder Mortise Lock with Utility Function and Escutcheon Trim

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Model: 8231 LE1A 26D
From the 8200 Series Collection
$1,799.49
$1,283.51
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$1,799.49
$1,283.51
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Sargent 8231-ET Heavy Duty Single Cylinder Mortise Lock with Utility Function and Escutcheon Trim

Industry Benchmark Mortise Lock with Maximum Security and Performance

The Sargent 8231-ET represents the industry benchmark for commercial mortise locks, delivering maximum security, performance, and durability with high-quality components. This heavy duty single cylinder mortise 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 utility function operation while maintaining Grade 1 operational performance per ANSI/BHMA A156.13 Series 1000 standards.

Professional Features & Benefits

  • Heavy-Duty Construction: Exceeds independently verified testing with completion of UL Cycle Above and Beyond test at 16 million cycles (Verification ID: V584148) for exceptional durability in high-traffic commercial applications.
  • Standard Door Specifications: Designed for 1 3/4" door thickness with 2 3/4" backset depth and 3/4" latchbolt throw for reliable latching performance.
  • Grade 1 Performance: ANSI/BHMA A156.13 Series 1000 Operational Grade 1 certification ensures maximum security and durability for commercial installations.
  • Universal Key System Integration: Integrates with all SARGENT key systems including Degree, Signature, KESO, and XC for comprehensive access control flexibility.
  • Comprehensive Fire Rating: UL-cUL Fire-Rated up to 3 hours with UL 10C positive pressure certification for critical fire safety applications.
  • EcoFlex Technology: Electromechanical versions operate from 12 to 24VDC with EcoFlex technology creating up to 89% energy savings and 96% power consumption reduction.
  • Extensive Function Options: Available in 56 different functions including electromechanical, security and monitoring configurations for diverse application requirements.
  • 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 requirements, and field reversible 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 for the lock body and strike plate.
  4. Install all mounting hardware including lock body, trim components, and strike plate, securing to door and frame per manufacturer torque specifications.
  5. Adjust operational components including latchbolt, deadbolt, and lever mechanism for proper alignment, latching, and smooth operation throughout the full range of motion.
  6. Test device operation to verify proper function of all lock components 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 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 the manufacturer's 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:
Utility Lock
Product Type:
Mortise Locks
Duty Level:
Heavy Duty
Handle Type:
Lever
Product Attribute:
Mortise Locks
Electronic:
No
Product Function:
Asylum/Institution/Utility
Product Category:
Mechanical Locks
Collection:
8200 Series
Department:
Door Hardware

Sargent 8231 LE1A 26D – Frequently Asked Questions

1) What does the utility function on the Sargent 8231 mortise lock actually do?
The 8231 is Sargent's utility (asylum/institution) function. Both levers are always locked, and the key retracts the latchbolt from either side. There is no free passage side, so it suits utility closets, mechanical rooms, and institutional openings where every entry should require a key. If you want the outside key-locked but the inside lever always free to exit, that is a storeroom function instead, such as the Accentra 8805FL.
2) Will the Sargent 8231-ET fit a 1-3/4 inch door with a 2-3/4 inch backset?
That is exactly what it is built for. The 8231-ET uses a 2-3/4 inch backset and is specified for 1-3/4 inch door thickness, with a 3/4 inch latchbolt throw. If your doors are thicker than 1-3/4 inches, this is not the configuration to order.
3) Is the Sargent 8231 fire rated for a 3 hour opening?
Yes. The 8200 Series mortise lock is UL-cUL fire rated up to 3 hours and carries UL 10C positive pressure certification, so it can go on a labeled 3 hour door assembly.
4) Is this lock Grade 1, and how many cycles is it tested to?
ANSI/BHMA A156.13 Series 1000 Operational Grade 1, and Sargent completed the UL Cycle Above and Beyond test at 16 million cycles (Verification ID V584148). For a facility standardizing on one lock across high-traffic openings, that is the durability number to put in the spec.
5) What do I have to specify when ordering a Sargent 8231-ET?
Four choices decide the part. Escutcheon trim design: LE1, LS, LW1, or WT. Lever style: A, B, E, F, J, L, P, or W. Finish, from 16 options including 26D satin chrome, 32D satin stainless, 10B oil rubbed bronze, and BSP black suede powder coat. Then the cylinder: standard cylinder, less cylinder, 70 for small format interchangeable core prep less core, or 60 for large format IC prep less core. Keying is a required selection too, keyed different, keyed alike, or to a supplied key code.
6) Can I get the Sargent 8231 prepped for small format or large format interchangeable cores?
Yes. Order suffix 70 for small format interchangeable core prep, less core, or 60 for large format IC prep, less core. Both ship without the core so you can pin and key them into your own system. There is also a standard cylinder option and a less cylinder option if you are supplying your own mortise cylinder.
7) Will this lock key into our existing Sargent master key system?
It will. The 8200 Series integrates with all Sargent key systems, including Degree, Signature, KESO, and XC. It is a single cylinder lock, so there is one keyed side. If you are adding doors to an existing building system, order keyed alike or supply your key code at checkout.
8) What is the closest Grade 1 mortise equivalent to the Sargent 8231 utility lock from another manufacturer?
The Sargent 8231-ET is a Grade 1 heavy duty single cylinder mortise lock with utility function and escutcheon trim. The nearest Grade 1 mortise peers are the Cal-Royal NM8080 storeroom mortise lockset for 1-3/4 inch doors, the Corbin Russwin ML2003 Grade 1 classroom mortise lockset in the ML2000 Series for 1-3/4 inch doors, and the Accentra 8805FL Grade 1 storeroom mortise lock with Arcadia lever in the 8800 Series. All are Grade 1 mortise bodies, but each is built around a different function, so confirm the function code matches the opening before substituting.
9) If the opening does not need a keyed cylinder, what mortise lock should be used instead of the Sargent 8231-ET?
The Sargent 8231-ET is keyed with a single cylinder, so for a non-keyed opening use a passage or privacy mortise body instead. Options include the Schlage PM010 Grade 1 passage latch mortise lock, non-keyed, for 1-3/4 inch doors; the Falcon MA101 Grade 1 heavy duty mortise passage lock with field reversible operation; the Hager 3810E Grade 1 passage mortise lock with escutcheon and 2-3/4 inch backset; and the Hager 3840S Grade 1 privacy mortise lock. The Hager 3810E shares the escutcheon trim style and 2-3/4 inch backset with the 8231-ET.
10) We need keypad or credential access on the same door prep as a Sargent 8231 mortise lock. What options exist?
The 8231-ET is a mechanical, non-electronic mortise lock. For electronic access on a mortise prep, comparable bodies include the BEST 45HZ EZ Series electronic keypad mortise lock with key override, the Schlage CO-100 standalone electronic mortise lock in privacy function with keypad reader for 1-3/4 inch doors, the TownSteel FME-2000 Grade 1 classroom mortise lockset with RFID, and the Schlage ENGAGE LEMD-GRW Grade 1 wireless mortise lock with 125 kHz proximity reader and a 3 hour fire rating. Electronic bodies require power or battery service the mechanical 8231 does not.
11) We need an electrified mortise lock instead of the mechanical Sargent 8231-ET. What are the options?
The 8231-ET as ordered is a mechanical, non-electronic lock. Electrified mortise peers include the BEST 45HW Series wired electromechanical mortise lock with 12V/24V operation, the Command Access ML190 motorized mortise lock with field selectable EL/EU operation on 24VDC in storeroom function, and the Schlage L9092EU with 03A electric lock/unlock outside lever, keyed outside, request to exit, 12/24VDC, for 1-3/4 inch doors in corridor function. Each requires a power transfer to the door that the mechanical 8231 does not.
12) Will the 3/4 inch latchbolt throw work with my existing ANSI strike?
The 8231 mortise lock throws its latchbolt 3/4 inch, which is the normal depth for a standard ANSI mortise strike pocket in a commercial frame. Paired with the 2-3/4 inch backset and a standard mortise pocket, it drops into an existing 8200 or ANSI A115.1 prep without frame work.
13) Does the Sargent 8231 need to be ordered handed?
Handing is not a separate part number here. The 8200 Series mortise lock body is field reversible, so one lock covers left and right hand openings and you set the hand during installation using the manufacturer template.
14) What is the difference between escutcheon trim and sectional rose trim on the 8200 Series?
The ET designation means escutcheon trim, a full plate running the height of the lock case rather than a small round rose at the lever. Escutcheon covers more of the door face, which helps when you are replacing older trim and want to hide existing prep marks. The same 8200 mortise body accepts sectional rose trims as well, and the installation template covers both.
15) Is this an electronic lock, and can I get an electrified version of the 8200 Series?
The 8231-ET itself is mechanical, not electronic. Sargent does offer electromechanical versions in the 8200 Series operating from 12 to 24VDC with EcoFlex technology. If you need a motorized retrofit body instead, the Command Access ML190 Series is a 24VDC mortise lock with field selectable EL/EU operation.
16) What other Grade 1 mortise locks compare to the Sargent 8200 Series?
For a straight Grade 1 mechanical mortise lock on a 1-3/4 inch door, the Corbin Russwin ML2003 (classroom) and the Cal-Royal NM8080 storeroom or NM8050 office/entrance locksets are comparable options. The BEST 45H Series heavy duty mortise bodies cover public entrance and intruder functions and are field reversible like the Sargent. If the requirement is anti-ligature trim for a behavioral health unit, the TownSteel MRX-L Series is the Grade 1 heavy duty lever version.
17) We need keypad access instead of keys on a mortise door. Is the 8231 the right choice?
No. The 8231-ET is a keyed mechanical lock with lever trim and no keypad. For pushbutton or credential access in a mortise prep, look at the Alarm Lock DL3500CR Trilogy Grade 1 electronic mortise lock, the Dormakaba E-Plex 2066 pushbutton mortise lock, or the Schlage CO-100 standalone keypad mortise lock. Sargent also publishes programming instructions for its own KP8200 keypad mortise lock.
18) Is a BEST 45H mortise lock body a drop-in substitute for the Sargent 8231-ET?
No. The BEST 45H Series is a heavy duty mortise lock body in public entrance function, and the 45HCA Intruder version is an intruder function body; both are lock bodies rather than complete lever-and-escutcheon locksets. The Sargent 8231-ET is supplied as a utility function lockset with escutcheon trim in LE1, LS, LW1 or WT styles and a choice of A, B, E, F, J, L, P or W levers. Substituting a BEST body means sourcing trim separately and accepting a different function.
19) Can a Baldwin 6310 mortise lock replace a Sargent 8231-ET?
Not without changing the door prep. The Baldwin 6310 entry/storeroom mortise lock body uses a 2-1/2 inch backset and covers doors 1-3/8 inch and over, and the 6301 entry/apartment body is also 2-1/2 inch backset for doors 1-3/4 inch and over. The Sargent 8231-ET is built on a 2-3/4 inch backset for 1-3/4 inch doors, so the mortise pocket and cross-bore centers differ.
20) What looks like a Sargent 8231-ET substitute but will not lock a door?
Trim-only and dummy items are the usual mix-up. The Schlage L0170 is a Grade 1 mortise non-keyed half dummy trim, the Falcon MESC600DT is a dummy escutcheon lever trim for M9900 Series exit devices, and the Emtek 3102 Memphis, 3104 Hamilton, 3106 Manhattan and 3019 Brisbane mortise entrance locksets are dummy function. The Sargent 8231-ET is a keyed single cylinder mortise lock with a working latchbolt.
21) Which mortise alternatives to the Sargent 8231-ET fit doors thinner or thicker than 1-3/4 inch?
The Sargent 8231-ET is designed for 1-3/4 inch door thickness. For thicker doors, the Hager 3810E and 3810S passage mortise locks cover 1-3/4 to 2-1/2 inch. For thinner or non-standard doors, the Alarm Lock DL2700CR and DL3500CR electronic classroom mortise locks cover 1-5/8 to 1-7/8 inch, and the Marks USA 21AC and 22AC ornamental iron mortise locks are built for 1 inch stiles.
22) For an office or entrance door, what is the alternative to the Sargent 8231-ET utility function?
The 8231-ET is utility function. For office and entrance openings, the Cal-Royal NM8050 is a Grade 1 office/entrance mortise lockset with auxiliary deadlatch for 1-3/4 inch doors, and 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 to 2-1/2 inch doors. The Hager is non-keyed, so specify it only where a key is not required.
23) Can I match the 8231 to the other door hardware finishes already in our building?
Sixteen finishes are offered, so matching an existing standard is usually straightforward: 03 bright brass, 04 satin brass, 09 bright bronze, 10 satin bronze, 10B oil rubbed dark 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, plus BSP black and WSP white suede powder coat. Most commercial buildings standardize on 26D or 32D.
24) Is there a lighter duty alternative to the Sargent 8231-ET heavy duty mortise lock?
The Sargent 8231-ET is a heavy duty Grade 1 commercial mortise lock. A lighter option is the Codelocks CL2255 electronic tubular mortise latch in brushed steel from the CL2000 Series, rated medium duty. The Dormakaba Saffire LX-I-M002 electronic RFID mortise lockset with BLE mobile access is BHMA Grade 2. Both trade the Grade 1 heavy duty cycle performance of the Sargent for a different feature set.
How fast can I get the Sargent 8231 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 8231 LE1A 26D come with a warranty?
Absolutely. The Sargent 8231 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 8231 LE1A 26D?
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