Sargent 8231 Heavy Duty Single...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$1,725.69
$1,320.63
Sargent Sargent 8200 Series - (8231) Utility Lock Function Rose Trim, Heavy Duty Single Cylinder Mortise Lock, Grade 1 SGT-8231

Sargent 8231 Heavy Duty Single Cylinder Mortise Lock with EcoFlex Technology - Grade 1 Utility Function

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Model: 8231 EA 26D
From the 8200 Series Collection
$1,725.69
$1,320.63
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$1,725.69
$1,320.63
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Sargent 8231 Heavy Duty Single Cylinder Mortise Lock with EcoFlex Technology and Grade 1 Rating

Industry Benchmark Mortise Lock with Maximum Security and Performance

The Sargent 8231 heavy duty single cylinder mortise lock represents the industry benchmark for commercial-grade security hardware, featuring Grade 1 operational rating and EcoFlex technology for up to 89% energy savings. This utility function model operates from 12 to 24VDC with field-reversible handing and delivers exceptional durability with UL testing completed at 16 million cycles. The multi-functional lock body accommodates 1 3/4" door thickness with 2 3/4" backset and includes a 3/4" latchbolt throw for reliable security performance.

Professional Features & Benefits

  • Exceptional Durability Rating: UL Cycle Above and Beyond test completed at 16 million cycles (Verification ID: V584148) for unmatched longevity in high-traffic commercial applications.
  • EcoFlex Energy Technology: Advanced power management creates up to 89% energy savings on electromechanical functions while maintaining reliable operation.
  • Flexible Power Operation: Standard 12 to 24VDC operation with field-reversible handing for versatile installation requirements.
  • Heavy-Duty Construction: Grade 1 operational rating with patented design and construction exceeding industry standards for strength and reliability.
  • Door Compatibility: Designed for 1 3/4" door thickness with 2 3/4" backset and 3/4" latchbolt throw for secure installation.
  • Universal Key System Integration: Compatible 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 NFPA 80 compliance for critical fire safety applications.
  • Manufacturer Warranty: 10-year limited warranty with 2-year coverage on electrical components for long-term confidence and protection.

Technical Specifications

  • Refer to manufacturer documentation for complete technical specifications.

Installation & Operation

  1. Verify electrical requirements match available power supply. Confirm 12 to 24VDC voltage 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, electromechanical functions, 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

  • Commercial Office Buildings
  • Educational Facilities
  • Healthcare Institutions
  • Government and Municipal Buildings
  • Industrial Facility Access Points
  • Multi-Tenant Residential Properties
  • Emergency Exit Compliance Systems

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 provides exceptional protection for demanding commercial applications. Engineered as the industry benchmark for mortise locks, this Grade 1 rated hardware combines maximum security with EcoFlex energy efficiency technology for dependable performance where reliability is 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 EA 26D – Frequently Asked Questions

1) What does the 8231 utility function actually do on the door?
The 8231 is Sargent's utility lock function, catalogued under asylum/institution/utility use. It is a single cylinder keyed lock with lever trim, the kind of function specified for utility rooms, mechanical spaces and institutional openings where key control governs access rather than a free-turning inside lever.
2) Do I have to order the Sargent 8231 handed left or right?
No. Handing is field reversible on the 8231, so one lock covers both left and right hand openings and you set it during install. That helps if you are stocking spares for a building with mixed handing.
3) Is the Sargent 8231 mortise lock fire rated?
It is UL 10C fire rated up to 3 hours and compliant with NFPA 80, so it can go on rated openings in stairwells, corridors and utility rooms where a 3 hour assembly is called out.
4) Will the 8231 latch into the strike that is already in my frame?
The 8231 uses a 3/4 inch latchbolt throw off a 2-3/4 inch backset mortise body. If the existing opening has a standard ANSI mortise strike with the frame pocket already cut for a 2-3/4 inch backset lock, the latch lines up. If the frame is prepped for a cylindrical lock or a non-standard backset, it will need new frame prep.
5) Can I key the Sargent 8231 into the master key system we already run?
Yes, if you are on a Sargent system. The 8231 works with all Sargent key systems including Degree, Signature, KESO and XC. You choose a standard cylinder, or order it prepped for interchangeable core: the 70 option is small format IC prep less core, the 60 option is large format IC prep less core. Less Cylinder is there if you are supplying your own.
6) What do I need to specify when ordering a Sargent 8200 Series mortise lock?
Four things beyond the function. Cylinder (standard, less cylinder, 60 large format IC prep or 70 small format IC prep), keying (keyed different, keyed alike, or to a key code you supply), lever style from A, B, E, F, J, L, P or W, and rose. Rose choices are LN at 2 inches, O at 2-3/4 inches, E at 3-1/16 inches and L at 3-1/2 inches. Then pick the finish.
7) My door is 2-1/2 inch backset prep, not 2-3/4 - can I use the Sargent 8231?
No. The Sargent 8231 mortise lock is built around a 2-3/4 inch backset in a 1-3/4 inch door. For an existing 2-1/2 inch backset mortise prep, the Baldwin 6301 is an entry/apartment mortise lock body on a 2-1/2 inch backset for 1-3/4 inch and over doors, available knob by knob or as the 6301LS lever by lever, and the Baldwin 6310 is an entry/storeroom mortise lock body on a 2-1/2 inch backset for 1-3/8 inch and over doors.
8) What is a Grade 1 mortise equivalent to the Sargent 8231 from another manufacturer for a storeroom opening?
The Sargent 8231 is a Grade 1 single cylinder mortise lock in the utility function. If the opening actually calls for storeroom function - key retracts the latch, lever always locked outside - the Accentra 8805FL is a Grade 1 storeroom mortise lock in 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 with an interchangeable core option. Function is the deciding difference: utility is not a substitute for storeroom on a stockroom or supply door.
9) Is the Sargent 8231 an electronic lock, and what is the electrified alternative?
The 8231 is a mechanical mortise lock, not an electronic one. When the opening needs access control or a wired electric function, the BEST 45HW is a heavy duty wired electromechanical mortise lock with 12V/24V operation, the Command Access ML190 is a heavy-duty motorized mortise lock with field selectable EL/EU operation on 24VDC in storeroom function, and the Schlage L9092EU with 03A trim is a heavy duty electric lock/unlock outside lever mortise lock, keyed outside, with request to exit, on 12/24VDC for 1-3/4 inch doors.
10) The Sargent 8231 is keyed - what do I use on an opening that needs no cylinder at all?
The 8231 is a keyed single cylinder lock, so a non-keyed opening is the wrong application for it. For passage or latch-only openings, the Schlage PM010 is a Grade 1 non-keyed passage mortise latch for 1-3/4 inch doors, the Falcon MA101 is a Grade 1 heavy duty mortise passage lock with field reversible operation and a fire rating, and the Hager 3810S and 3810E are Grade 1 passage mortise locks with a 2-3/4 inch backset, offered with rose and escutcheon trim respectively, for 1-3/4 inch to 2-1/2 inch doors.
11) For a behavioral health or ligature-resistant opening, is the Sargent 8231 the right mortise lock?
The 8231 uses lever trim with A, B, E, F, J, L, P and W lever styles, which is standard commercial trim rather than anti-ligature. For ligature-resistant openings, TownSteel offers the MRX-L-01 Grade 1 heavy duty anti-ligature lever mortise lockset and the MRX-A-01 with satin stainless ligature resistant arch trim, both passage function for 1-3/4 inch doors, 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.
12) Can I use a Dormakaba Saffire or Schlage LE mortise lock in place of the Sargent 8231 where a Grade 1 spec is written?
Not where Grade 1 is a hard requirement. The Sargent 8231 carries a Grade 1 rating. The Dormakaba LX-I-M002 Saffire electronic RFID mortise lockset with BLE mobile access is BHMA Grade 2, and the Schlage Electronics LEBMB-ADD mobile-enabled mortise lock with push button and LED is Grade 2 for 1-3/4 inch doors with a 3 hour fire rating. If the spec calls for a Grade 1 electrified mortise, the Schlage LEMD-GRW ENGAGE wireless mortise lock is Grade 1 with a 3 hour fire rating, and the Dormakaba E-Plex E5086 back to back pushbutton/card mortise lock is Grade 1.
13) I have narrow stile aluminum storefront and glass doors - does the Sargent 8231 fit?
The 8231 is sized for a 1-3/4 inch wood or hollow metal door with a 2-3/4 inch backset mortise pocket, so it is not a storefront part. For Adams Rite deadlatch preps in aluminum doors, the Alarm Lock DL1300NW Trilogy Networx wireless electronic mortise lock with keypad is built for Adams Rite deadlatches, and for a glass door bottom rail the Kaba Ilco BR Series bottom rail lock is the correct family.
14) Can I match the Sargent 8231 to the finishes on the rest of my building's doors?
There are 16 finishes to work from: bright and satin brass (03, 04), bright and satin bronze (09, 10), three dark oxidized satin bronze variants (10B oil rubbed, 10BE, 10BL clear coated), bright and satin nickel (14, 15), dark statuary bronze 20D, bright and satin chrome (26, 26D), bright and satin stainless (32, 32D), plus black and white suede powder coat (BSP, WSP). 26D and 32D are the usual choices for standardizing an institutional building.
15) How durable is the Sargent 8231 for a high traffic institutional opening?
It carries a Grade 1 operational rating and is catalogued as heavy duty commercial hardware. Sargent completed UL Cycle Above and Beyond testing at 16 million cycles on the 8200 Series, which is the kind of number that matters on a dorm, school or hospital utility door getting hit all day.
16) Should I use a mortise lock like the Sargent 8231 or a cylindrical lock?
A mortise lock takes a rectangular pocket machined into the door edge and gives you a heavier body, a 3/4 inch latch throw and more function options, which is why it is specified for institutional and high traffic openings. A cylindrical lock installs through two bored holes and is faster to retrofit but a lighter assembly. If your doors are already prepped with round bores, a Grade 1 cylindrical such as the Schlage PC10 is the simpler swap; cutting a mortise pocket into an existing cylindrical door is a shop operation.
17) Can I use the Sargent 8231 on a door thicker than 1-3/4 inches?
Not as specified. The 8231 is set up for 1-3/4 inch doors. For thicker leaves, the Hager 3800 Series Grade 1 mortise locks cover 1-3/4 to 2-1/2 inches, and the Baldwin 6301 and 6310 mortise bodies are listed for 1-3/4 inch and over on a 2-1/2 inch backset.
18) If I need keypad access on a mortise prep instead of a key like the Sargent 8231, what are the options?
The 8231 is keyed and takes a single cylinder. For keypad credentials on a mortise prep, the Alarm Lock DL3500CR is a Grade 1 Trilogy electronic mortise lock with 300 user codes in classroom function for 1-5/8 to 1-7/8 inch doors, the BEST 45HZ EZ Series is an electronic keypad mortise lock with key override, the Accentra NTM623-NR nexTouch Generation 3 uses a capacitive touchscreen keypad with cylinder override and no deadbolt, and the Dormakaba E-Plex 2066 is an electronic pushbutton keyless mortise lock for wide stile doors.
19) Which mortise locks look like substitutes for the Sargent 8231 but will not actually lock a door?
The 8231 is a keyed single cylinder utility lock. Several mortise-style items in the same trim families do not latch or lock at all: the Schlage L0170 is a Grade 1 non-keyed half dummy trim for 1-3/4 inch doors, and the Emtek 3019 Brisbane, 3102 Memphis, 3104 Hamilton and 3106 Manhattan mortise entrance locksets are dummy function. The Falcon MESC600DT is also dummy - it is escutcheon lever trim for M9900 Series exit devices, not a lock body.
20) What is the difference between the Sargent 8231 and an intruder or public entrance mortise lock body?
The 8231 is a keyed single cylinder utility function lock body with a 3/4 inch latchbolt throw for 1-3/4 inch doors. The BEST 45HCA heavy duty mortise lock body is offered in public entrance function, which leaves the lever free until locked by key, and in intruder function for lockdown from the secure side. Those are function differences, not grade differences - choose by how the door needs to behave during normal use and lockdown.
21) I need privacy function for a restroom - what replaces the Sargent 8231 there?
A keyed utility lock like the 8231 is not a privacy device. Grade 1 privacy mortise options include the Cal-Royal NM8440 privacy mortise lockset with deadbolt for 1-3/4 inch doors and the Hager 3840S 3800 Series privacy mortise lock with a 2-3/4 inch backset for 1-3/4 inch to 2 inch doors. If the restroom needs electronic privacy with a keypad, the Schlage CO-100 is a Grade 1 heavy duty standalone electronic mortise lock in privacy function with keypad reader for 1-3/4 inch doors.
22) The opening needs a deadbolt only, no latch - what instead of the Sargent 8231?
The 8231 is a latching mortise lock with a 3/4 inch latchbolt throw. For deadbolt-only mortise applications, the Kaba Ilco 185 Series mortise lock is a deadbolt function with no handing, sold in a single pack, and the Alarm Lock 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.
23) What are the Grade 1 alternatives to the Sargent 8231 if the classroom needs lockdown from inside the room?
The 8231 is a utility function lock and does not provide a lockdown function. For classroom lockdown, the TownSteel FME-4000 Series is a Grade 1 heavy duty electronic intruder classroom mortise lockset with RFID technology for 1-3/4 inch doors, and the TownSteel FME-2000 Series is a Grade 1 heavy duty classroom mortise lockset with RFID for 1-3/4 inch doors. A mechanical option is the BEST 45HCA heavy duty mortise lockbody in intruder function.
24) How does the Sargent 8231 compare with the Hager 3850E office mortise lock for a tenant office door?
The Sargent 8231 is a Grade 1 keyed single cylinder utility mortise lock for 1-3/4 inch doors with a 2-3/4 inch backset, offered with E, L, LN and O roses. The Hager 3850E 3800 Series is an office function mortise lock with lever and escutcheon trim, non-keyed, on a 2-3/4 inch backset for 1-3/4 inch to 2-1/2 inch doors. The 3850E shares the backset but comes as escutcheon trim and without a cylinder, so it suits an office door where no key is required.
25) Where do I find the door prep template for a Sargent 8200 mortise lock?
Sargent publishes an installation template covering 7800 and 8200 Series mortise locks with all sectional rose trims and escutcheon trims, plus a full 7800/8200 mortise lock catalog. Both are linked in the product documents, and the template is what your door shop needs for the pocket, cross bore and trim layout before the lock arrives.
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Does the Sargent 8231 EA 26D come with a warranty?
Absolutely. The Sargent 8231 EA 26D is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
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