Sargent 8251 Storeroom Deadbol...
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$1,773.66
$1,243.18
Sargent Sargent 8200 Series - (8251) Storeroom Deadbolt Rose Trim, Heavy Duty Single Cylinder with Deadbolt Mortise Lock, Grade 1 SGT-8251

Sargent 8251 Storeroom Deadbolt Mortise Lock with Heavy Duty Single Cylinder and Rose Trim

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Model: 8251 EA 26D
From the 8200 Series Collection
$1,773.66
$1,243.18
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$1,773.66
$1,243.18
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Sargent 8251 Heavy Duty Single Cylinder Storeroom Deadbolt Mortise Lock with Rose Trim

Industry Benchmark Mortise Lock with Maximum Security and Performance

The Sargent 8251 heavy duty single cylinder storeroom deadbolt mortise lock delivers maximum security, performance, and durability as the industry benchmark for commercial mortise locks. This professional-grade lock features a 2 3/4" backset, 1 3/4" door thickness compatibility, and 3/4" latchbolt throw for reliable operation. The lock integrates with all SARGENT key systems including Degree, Signature, KESO, and XC, and operates from 12 to 24VDC with EcoFlex technology reducing power consumption up to 96%.

Professional Features & Benefits

  • Precision Door Specifications: Standard 2 3/4" backset depth with 1 3/4" door thickness and 3/4" latchbolt throw for reliable mechanical operation.
  • Ultra-High Durability Rating: UL Cycle Above and Beyond test completed at 16 million cycles (Verification ID: V584148) for exceptional longevity in high-traffic commercial applications.
  • EcoFlex Energy Technology: Operates from 12 to 24VDC with power consumption reduction up to 96% on electromechanical functions, creating up to 89% energy savings for cost-effective operation.
  • Heavy-Duty Construction: Multi-functional lock body with patented design and construction provides maximum strength and reliability exceeding industry standards.
  • Universal Key System Integration: Compatible with all SARGENT key systems including Degree, Signature, KESO, and XC for flexible security management.
  • Fire-Rated Performance: UL 10C Fire-Rated up to 3 hours with NFPA 80 compliance for critical fire safety applications.
  • Comprehensive 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. Verify electrical requirements match available power supply. Confirm voltage (12 to 24VDC) 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 any configurable options per application requirements.
  6. Restore power and test all functions including normal operation, alarm/alert 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
  • 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:
Storeroom Deadbolt
Product Type:
Mortise Locks
Duty Level:
Heavy Duty
Handle Type:
Lever
Product Attribute:
Mortise Locks
Electronic:
No
Product Function:
Storeroom
Product Category:
Mechanical Locks
Collection:
8200 Series
Department:
Door Hardware

Sargent 8251 EA 26D – Frequently Asked Questions

1) Does the Sargent 8251 latch into an existing ANSI mortise strike?
The 8251 uses a 3/4 inch latchbolt throw, the standard commercial mortise latch projection, so it engages a normal ANSI mortise strike lip and pocket. The separate deadbolt is what secures the opening; the latch alone holds the door closed. Check that your existing strike has both a latch and a deadbolt cutout, since the 8251 is a deadbolt function lock and a latch-only strike will not accept the bolt.
2) What does storeroom function mean on the Sargent 8251, and is it right for a mechanical or supply room?
Storeroom function means the outside lever is always locked and retracts the latch only by key; the inside lever always retracts the latch for free egress. On the 8251 there is also a deadbolt, thrown and retracted by the same single cylinder from outside. That combination suits storerooms, electrical and mechanical rooms, IT closets and stock rooms where the door must never be left unlocked by accident but people inside must always be able to get out.
3) What do I have to specify when ordering a Sargent 8251 mortise lock?
Four things beyond the function. 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 a specific key code (choose none if you ordered less cylinder). Lever design: A, B, E, F, J, L, P or W. Rose: E rose at 3-1/16 inches, L rose at 3-1/2 inches, LN rose at 2 inches, or O rose at 2-3/4 inches. Then the finish.
4) Can I get the Sargent 8251 keyed into my building's existing Sargent master key system?
Yes. The 8251 works with all Sargent key systems, including Degree, Signature, KESO and XC, so it can be keyed into an existing Sargent masterkey plan. If your facility uses interchangeable cores, order the 70 prep for small format IC or the 60 prep for large format IC less core and drop your own cores in. For a new opening keyed to match others being ordered at the same time, specify keyed alike; separate keys per door is keyed different.
5) Is the Sargent 8251 an electronic lock, and does it need power?
No. The 8251 as ordered here is a mechanical, key operated storeroom deadbolt lock with lever trim; nothing needs to be wired and no power supply is required. If you need an electrified mortise lock instead, the BEST 45HW wired electromechanical mortise lock runs on 12V or 24V, and the Command Access ML190 Series is a motorized storeroom mortise lock with field selectable fail safe or fail secure and 24VDC power.
6) Will the Sargent 8251 work on a 1-3/8 inch or a 2 inch thick door?
No. The 8251 is specified for 1-3/4 inch door thickness, the standard commercial thickness, and is not a range product. For a thicker door, Baldwin 6310 mortise lock bodies are listed for 1-3/8 inch and over and Hager 3800 Series mortise locks such as the 3810S cover 1-3/4 to 2-1/2 inches, though those are entrance/storeroom and passage functions rather than a storeroom deadbolt.
7) Is the Sargent 8251 a mortise lock or a cylindrical lock, and does my door already have the right prep?
The 8251 is a mortise lock. It needs a rectangular pocket machined into the edge of the door plus face bores for the lever spindle and the cylinder, which a cylindrical lock does not. A door prepped for a bored cylindrical lockset will not take it without new machining. Sargent publishes an installation template covering 7800 and 8200 Series mortise locks with all sectional rose and escutcheon trims, which is what a carpenter or installer should lay out from. If your opening is bored rather than mortised, a cylindrical lock such as the Schlage PC Series is the type that fits that prep.
8) I need a mortise lock for a 1-5/8 inch aluminum storefront door - can I use the Sargent 8251?
No. The Sargent 8251 is specified for 1-3/4 inch door thickness. For thinner doors, the Alarm Lock Trilogy locks cover 1-5/8 inch to 1-7/8 inch: the DL2700CR is a Grade 1 electronic mortise lock with classroom function and weatherproof design, the DL3500CR is a Grade 1 electronic mortise lock with 300 user codes and classroom function, and the DL4500DB is a Grade 1 electronic mortise deadbolt with 2,000 user codes and a privacy keypad. The DL1300NW is a Networx wireless electronic mortise lock with keypad built for Adams Rite deadlatches, which is the narrow stile storefront case specifically.
9) What is the closest Grade 1 storeroom mortise lock to the Sargent 8251 from another manufacturer?
The Accentra 8805FL is the nearest straight equivalent: a Grade 1 mortise lock in the 8800 Series with a storeroom function, matching the Sargent 8251's Grade 1 rating and storeroom function. The Cal-Royal NM8080 is a second Grade 1 storeroom mortise lockset, listed for 1-3/4 inch doors with an interchangeable core option, which lines up with the 8251's 1-3/4 inch door thickness and its 70 small format and 60 large format interchangeable core preps. The one thing neither peer states is the auxiliary deadbolt the 8251 carries as a storeroom deadbolt function, so if the opening needs the deadbolt throw, the 8251 is the one that specifies it.
10) Is the Baldwin 6310 mortise lock a substitute for the Sargent 8251 on a commercial storeroom door?
They are not interchangeable in the door. The Baldwin 6310 is an entrance/storeroom mortise lock body built on a 2-1/2 inch backset, and the Sargent 8251 uses a 2-3/4 inch backset - the cross-bore and edge prep do not line up, so it is not a drop-in swap. The Baldwin 6310 is offered knob by knob, and the 6310190RRLS is the lever by lever version in a right hand reverse configuration. The Sargent 8251 is a lever product with A, B, E, F, J, L, P and W lever styles. If the existing door is prepped 2-1/2 inch, the Baldwin bodies fit it; if it is prepped 2-3/4 inch, the 8251 does.
11) The opening needs the lever released electrically from an access control panel - what replaces the Sargent 8251?
The Sargent 8251 is a mechanical storeroom lock, so an electrified mortise lock is the part for a panel-controlled opening. The Schlage L9092EU with 03A trim is a heavy duty electric lock/unlock outside lever mortise lock, keyed outside, with request to exit, running on 12/24VDC for 1-3/4 inch doors. The Command Access ML190 is a heavy duty motorized mortise lock with field selectable EL/EU operation on 24VDC in a storeroom function, which is the same function as the 8251. The BEST 45HW is a heavy duty wired electromechanical mortise lock with 12V/24V operation.
12) What is the difference between the Sargent 8251 and the Schlage LEBMB or Dormakaba Saffire mortise locks on grade?
The Sargent 8251 is Grade 1, as is the Schlage LEMD-GRW ENGAGE wireless mortise lock, which is fire rated 3 hours and carries a 125kHz proximity reader. The Schlage LEBMB-ADD mobile enabled mortise lock is Grade 2 with a 3 hour fire rating for 1-3/4 inch doors, and the Dormakaba Saffire LX-I-M002 electronic RFID mortise lockset with BLE mobile access is BHMA Grade 2. Grade 1 is the heavier cycle and strength category, and the 8251 is fire rated UL 10C up to 3 hours with NFPA 80 compliance, so on a rated opening the fire rating carries across all four while the grade does not.
13) We standardize on interchangeable cores across the facility - which mortise locks besides the Sargent 8251 take them?
The Sargent 8251 is ordered with a 70 small format interchangeable prep less core or a 60 large format interchangeable prep less core, alongside standard cylinder and less cylinder, so it drops into an existing SFIC or LFIC program and integrates with the SARGENT Degree, Signature, KESO and XC key systems. Among the peers, the Cal-Royal NM8080 is a Grade 1 storeroom mortise lockset offered with an interchangeable core option for 1-3/4 inch doors, and the BEST 45HZ EZ Series is an electronic keypad mortise lock with key override function for openings where a keypad is wanted but the key system still has to reach the door.
14) Is the Sargent 8251 mortise lock durable enough for a high traffic building?
The 8251 lock body completed UL Cycle Above and Beyond testing at 16 million cycles, verification ID V584148, and is classified Grade 1 heavy duty for commercial use. For a property manager standardizing across a portfolio, that is a lock body rated well past the ANSI Grade 1 minimum, which is why the 8200 Series shows up on office, healthcare, school and multi-tenant openings that cycle all day.
15) Which rose size should I pick for a Sargent 8251 on a narrow stile or a door with an old escutcheon scar?
Four rose sizes are offered: LN at 2 inches, O at 2-3/4 inches, E at 3-1/16 inches, and L at 3-1/2 inches. The 3-1/2 inch L rose covers the most face area, which helps hide paint lines or holes left by a previous escutcheon trim. The 2 inch LN rose is the smallest footprint when the door face or a glass light leaves little room around the lever.
16) What finishes does the Sargent 8251 come in for matching hardware already in my building?
Sixteen finishes are offered on the 8251: 03 bright brass, 04 satin brass, 09 bright bronze, 10 satin bronze, 10B dark oxidized satin bronze oil rubbed, 10BE dark oxidized satin bronze, 10BL dark oxidized satin bronze clear coated, 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. For most commercial interiors already running satin chrome or satin stainless trim, 26D and 32D are the two that match.
17) I need a classroom function mortise lock, not storeroom. What should I order instead of the 8251?
Storeroom is the wrong function for a classroom, since a teacher cannot lock the door from inside. For Grade 1 classroom function on a 1-3/4 inch door, the Corbin Russwin ML2003 from the ML2000 Series and the Cal-Royal NM8070 are both mechanical classroom mortise locksets. If you want classroom lockdown with electronics, the TownSteel FME-4000 Series is an electronic intruder classroom mortise lockset with RFID, and the Alarm Lock DL3500CR is a Grade 1 classroom function electronic mortise lock for 1-5/8 to 1-7/8 inch doors.
18) Can I order the Sargent 8251 without a cylinder so my locksmith supplies the core?
Yes. Four cylinder choices are offered: standard cylinder, less cylinder, 70 prep for small format interchangeable core less core, or 60 prep for large format interchangeable core less core. If you pick less cylinder, set the keying selection to none. Locksmiths keying a whole building typically take the 70 or 60 prep and install their own cores on site so the doors can be hung before the keying plan is finalized.
19) I do not need the door keyed - what is the equivalent mortise lock without a cylinder?
The Sargent 8251 is a keyed single cylinder lock, so for an opening that only needs the door to latch, a non-keyed mortise body is the simpler part. The Schlage PM010 is a Grade 1 passage latch mortise lock, non-keyed, for 1-3/4 inch doors. The Hager 3810S is a Grade 1 passage mortise lock with rose and a 2-3/4 inch backset, which matches the 8251's 2-3/4 inch backset and rose trim, and the Hager 3810E is the same passage function with escutcheon trim. The Falcon MA101 is a Grade 1 heavy duty mortise passage lock that is field reversible and carries a fire rating.
20) Which mortise lock should I use on a restroom or bedroom door instead of a storeroom lock?
A storeroom function like the Sargent 8251 keys from the outside and is not what a restroom or bedroom wants. 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 doors 1-3/4 inch to 2 inch. Both are privacy function, meaning the occupant locks from inside rather than the door being keyed. The NM8440 carries a deadbolt, which is the closest behavior to the 8251's storeroom deadbolt on a privacy opening.
21) What is the difference between the Sargent 8251 and an electronic mortise lock like the Schlage CO-100 or TownSteel FME-2000?
The Sargent 8251 is a mechanical lock - it is not an electronic product, and access is controlled by key through the SARGENT key systems. The electronic mortise locks are credential-driven at the door: the Schlage CO-100 is a Grade 1 standalone electronic mortise lock with a keypad reader for 1-3/4 inch doors, and the TownSteel FME-2000 is a Grade 1 heavy duty mortise lockset with RFID technology, also for 1-3/4 inch doors. Choosing between them is a question of whether credentials are issued and audited at each door or the building is managed on a key system.
22) I only need the mortise lock body, not a complete lockset with lever and rose - what do I order?
The Sargent 8251 ships as a complete lockset with lever and rose trim, with E, L, LN and O rose sizes and eight lever styles. When the trim is already on the door and only the body is being replaced, the BEST 45H series is a heavy duty mortise lock body: the 45HCAC is public entrance function and field reversible, and the 45HCAINL is an intruder function lockbody. Both match the 8251 on heavy duty construction. Note the function is different on each, so confirm the lever behavior the opening needs before swapping a body in.
23) Will an Emtek 3102 or Emtek 3019 mortise entrance lockset work in place of a Sargent 8251?
No. The Emtek 3102 Memphis and Emtek 3019 Brisbane are dummy function mortise entrance locksets - a dummy has no latch operation at all and mounts as trim on a fixed or inactive leaf. The Sargent 8251 is a keyed storeroom deadbolt function with a 3/4 inch latchbolt throw. The Emtek units and the 8251 are not alternatives to each other; a dummy is only correct where nothing needs to latch or lock. The Schlage L0170 is likewise a Grade 1 non-keyed half dummy trim.
24) What mortise lock do I use in a behavioral health or ligature resistant application where the Sargent 8251 lever is not acceptable?
A standard lever like the eight lever styles on the Sargent 8251 presents a ligature point. For those openings the TownSteel MRX-L-01 is a Grade 1 heavy duty anti-ligature lever mortise lockset in stainless steel with passage function for 1-3/4 inch doors, and the MRX-A-01 is the same passage function with a satin stainless steel ligature resistant arch trim. The Marks USA MAR5PDN is a Grade 1 hospital passage mortise push/pull paddleset that is ligature resistant and ADA compliant in satin stainless steel. All three are passage function rather than the keyed storeroom function of the 8251.
25) Is the Kaba Ilco 185 mortise lock an alternative to the Sargent 8251 storeroom deadbolt?
Only if the opening needs a deadbolt alone. The Kaba Ilco 185 Series is a deadbolt function mortise lock supplied with no handing, in a single pack. The Sargent 8251 is a storeroom deadbolt function - it combines the deadbolt with a keyed lever that is always locked outside and always free inside, with a 3/4 inch latchbolt throw. Where a door already has a separate lever or push/pull and only needs the bolt, the 185 covers it; where one lock has to do both the latching and the bolting, the 8251 does.
26) What is the difference between the Sargent 8251 and the Cal-Royal NM8050 office entrance lockset?
Function. The Cal-Royal NM8050 is a Grade 1 heavy duty office/entrance mortise lockset with auxiliary deadlatch for 1-3/4 inch doors - office function lets the outside lever be left unlocked for business hours and locked when the office closes. The Sargent 8251 is a storeroom deadbolt function, where the outside lever stays locked at all times and entry is always by key. Both are Grade 1 heavy duty on a 1-3/4 inch door, so the door prep and duty class are the same; choose on whether staff need to leave the door on free access during the day.
27) Can I use the Schlage PC10 cylindrical lock instead of the Sargent 8251 mortise lock?
They prep the door differently. The Schlage PC10 is a Grade 1 passage cylindrical lock, non-keyed with rose, for 1-3/4 inch doors - a cylindrical lock installs into a bored cross-bore, while the Sargent 8251 is a mortise lock that requires a mortise pocket cut into the door edge. A door prepped for one is not prepped for the other without new door work. The PC10 is also passage function against the 8251's keyed storeroom deadbolt, so it does not secure the opening either.
28) Which keyless mortise lock should I look at if I want to stop issuing keys entirely on a Sargent 8251 opening?
The Sargent 8251 is a keyed lock running on the SARGENT key systems. To remove keys from the opening, the Dormakaba E-Plex 2066 is an electronic pushbutton keyless mortise lock, and the E-Plex E5086 is a Grade 1 entry/egress electronic pushbutton and card back to back mortise lock, matching the 8251's Grade 1 rating. The Dormakaba PowerPlex P2066 is a mortise lock in the PowerPlex 2000 Series. The Accentra NTM623-NR nexTouch Generation 3 is a Grade 1 mortise lock with a capacitive touchscreen keypad, no deadbolt, with cylinder override, which keeps a key path for lockout recovery while daily use stays codes.
29) Is the Codelocks CL2255 a substitute for the Sargent 8251 on a commercial storeroom?
Not on a heavy traffic commercial opening. The Codelocks CL2255 is a medium duty electronic tubular mortise latch in the CL2000 Series with a brushed steel finish - a latch, without the keyed storeroom deadbolt function. The Sargent 8251 is heavy duty commercial with a UL Cycle Above and Beyond test completed at 16 million cycles and a storeroom deadbolt function. On a low traffic interior door where code entry is the goal the CL2255 is a fit; on a stockroom cycled all day it is a different duty class.
30) Will a Marks USA 21AC or 22AC ornamental iron mortise lock replace a Sargent 8251?
No - the door thickness rules it out in both directions. The Marks USA 21AC and 22AC are entrance double cylinder ornamental iron mortise locks with a round knob, specified for 1 inch doors, which is the narrow ornamental iron gate and door case. The Sargent 8251 is specified for 1-3/4 inch doors and is a single cylinder storeroom deadbolt with a lever. Match the lock to the leaf: 1 inch ornamental iron takes the Marks bodies, a 1-3/4 inch commercial door takes the 8251.
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Does the Sargent 8251 EA 26D come with a warranty?
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