Sargent 8257 Institutional Pri...
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$1,725.69
$1,320.63
Sargent Sargent 8200 Series - (8257) Institutional Privacy Lock Function Rose Trim, Heavy Duty Single Cylinder Mortise Lock, Grade 1 SGT-8257

Sargent 8257 Institutional Privacy Lock Heavy Duty Grade 1 Mortise Lock with EcoFlex Technology

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Model: 8257 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 8257 Grade 1 Institutional Privacy Mortise Lock with EcoFlex Technology

Industry Benchmark Mortise Lock with Maximum Security and Performance

The Sargent 8257 represents the industry benchmark for commercial mortise locks, delivering maximum security, performance, and durability with high-quality components. This Grade 1 institutional privacy lock features a multi-functional lock body with 2 3/4" backset, 1 3/4" door thickness compatibility, and 3/4" latchbolt throw. The electromechanical version operates from 12 to 24VDC with revolutionary EcoFlex technology that reduces power consumption up to 96%, while maintaining UL 10C fire rating up to 3 hours and ANSI/BHMA A156.13 Series 1000 certification.

Professional Features & Benefits

  • Exceptional Durability Testing: UL Cycle Above and Beyond test completed at 16 million cycles (Verification ID: V584148) for unmatched reliability in high-traffic commercial applications.
  • EcoFlex Energy Technology: Revolutionary technology creates up to 89% energy savings on all electromechanical functions while maintaining full operational performance.
  • Flexible Power Operation: Electromechanical version operates from 12 to 24VDC for versatile integration with various access control systems.
  • Heavy-Duty Construction: Multi-functional lock body with patented design and construction provides maximum security and performance for institutional applications.
  • Universal Key System Integration: Integrates with all SARGENT key systems including Degree, Signature, KESO, and XC for comprehensive security management.
  • Comprehensive Function Options: Available in 56 different functions including electromechanical, security and monitoring configurations for diverse application requirements.
  • Fire Safety Compliance: UL 10C positive pressure fire-rated up to 3 hours with NFPA 80 compliance for critical life safety applications.
  • Manufacturer Warranty: 10-year limited warranty with 2-year coverage on electrical components for long-term protection and confidence.

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

  • Healthcare Facility Access Control
  • Educational Institution Security Systems
  • Commercial Office Buildings
  • Government and Municipal Buildings
  • Industrial Facility Monitoring
  • Multi-Tenant Residential Properties
  • Institutional Privacy Applications

Why Choose Sargent Quality?

Sargent 8200 Series mortise locks deliver professional-grade reliability with patented design and construction rated for 16 million cycles in independent UL testing. The 10-year limited warranty with 2-year electrical component coverage provides exceptional protection for demanding commercial applications. Engineered with comprehensive certifications including ANSI/BHMA Grade 1, UL 10C fire rating, and ADA compliance, these locks represent the industry benchmark where dependable performance and maximum security 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:
Institutional Privacy
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 8257 EA 26D – Frequently Asked Questions

1) What does the Sargent 8257 institutional privacy function actually do on a patient or resident room door?
The 8257 is an institutional privacy function in the Sargent 8200 mortise family. The lever locks for privacy from inside the room, and staff get in from the corridor with a key in the outside cylinder, so no one can seal themselves in against a caregiver. It is a single cylinder keyed lock with lever trim. That is what separates it from a plain bed/bath privacy lock like the Hager 3840S, which is non-keyed and relies on an emergency tool rather than a key override.
2) Will the Sargent 8257 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 8257 lock body uses a 2-3/4 inch backset and is sized for 1-3/4 inch door thickness, which is the standard commercial door. If your existing mortise pocket is cut to ANSI 2-3/4 backset, the body drops into it.
3) Will the 8257 latch into the strike already in my frame?
The latchbolt throws 3/4 inch, which is the standard mortise latch projection, so it will engage a normal ANSI mortise strike with a 1-1/4 by 4-7/8 inch lip cut. If the frame was prepped for a bored lockset rather than a mortise lock, the strike will not line up and the frame needs new prep.
4) Can I use the Sargent 8257 on a fire rated corridor door?
Yes. The 8200 Series lock body carries UL 10C positive pressure fire rating up to 3 hours with NFPA 80 compliance, and it is ANSI/BHMA A156.13 Series 1000 Grade 1. That covers the usual 90 minute corridor and stair openings in healthcare and schools.
5) What do I have to specify when ordering a Sargent 8257 besides the function?
Four things beyond the 8257 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 you supply. Lever design: A, B, E, F, J, L, P or W. Rose: LN at 2 inches, O at 2-3/4 inches, E at 3-1/16 inches, or L at 3-1/2 inches. Then the finish.
6) Can I key the Sargent 8257 into the master key system already running in my building?
The 8200 Series integrates with all Sargent key systems, including Degree, Signature, KESO and XC. If your facility is already on one of those, order the 8257 keyed alike or supply your key code. If you run interchangeable cores from another supplier, order it with the 70 prep for small format cores or 60 prep for large format cores and drop your own cores in.
7) Is the Sargent 8257 an electrified lock I can tie into access control?
No. The 8257 as supplied is a mechanical institutional privacy lock, not an electronic one. Electrified versions exist elsewhere in the 8200 Series running 12 to 24VDC with EcoFlex, but if you need a powered opening on an access control head end, look at a purpose built electric mortise lock such as the BEST 45HW wired electromechanical mortise lock with 12V/24V operation or the Command Access ML190 motorized mortise lock with field selectable EL/EU at 24VDC.
8) What is the closest Grade 1 mortise privacy lock to the Sargent 8257 from another manufacturer?
For a straight Grade 1 mortise privacy substitution, the Cal-Royal NM8440 is a heavy duty Grade 1 privacy/bed/bath 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 to 2 inch. The difference is in function detail: the Sargent 8257 is an institutional privacy function, which is the asylum/institution/utility style of privacy where the outside is key-operated by a single cylinder rather than an emergency turn release. If the opening genuinely requires the institutional behavior, a standard bed/bath privacy lock is not an equivalent even though both are called privacy.
9) I need the same Sargent 8200 mortise lock but in a classroom function instead of institutional privacy - what should I order?
The 8257 is fixed as an institutional privacy function, so a different function code is a different lock. Cross-brand Grade 1 classroom mortise options include the Corbin Russwin ML2003 for 1-3/4 inch doors, the Cal-Royal NM8070 heavy duty Grade 1 classroom mortise lockset with auxiliary deadlatch, and the TownSteel FME-2000, a Grade 1 heavy duty classroom mortise lockset with RFID credential reading. All three are mortise bodies, so the door prep carries over from an 8200 opening.
10) We are specifying behavioral health rooms - is the Sargent 8257 the right pick or is there a ligature resistant option?
The 8257 is an institutional privacy mortise lock supplied with lever trim, and levers are a ligature point in behavioral health openings. For those rooms, the TownSteel MRX-A-01 is a Grade 1 heavy duty ligature resistant arch trim mortise lockset in satin stainless, the MRX-L-01 is the Grade 1 anti-ligature lever version, and the Marks USA 5PDN is a Grade 1 hospital passage mortise push/pull paddleset described as ligature resistant and ADA compliant. Note those three are passage functions, so they do not provide the keyed institutional privacy control the 8257 gives you.
11) Does the Sargent 8257 work on an access control system, or do I need a different lock?
The 8257 as configured is a mechanical, non-electronic single cylinder mortise lock. If the opening is being tied to access control, look at a wired or credential-reading mortise body instead: the BEST 45HW is a wired electromechanical mortise lock with 12V/24V operation, the Command Access ML190 is a heavy-duty motorized mortise lock with field selectable fail safe or fail secure and 24VDC power, and the Schlage L9092EU with 03A trim is a heavy duty electric lock/unlock outside lever mortise lock with request-to-exit at 12/24VDC for 1-3/4 inch doors.
12) For a classroom that needs lockdown from inside the room, is the 8257 the right lock or should I look at an intruder function?
The 8257 is an institutional privacy function, which locks from the occupant side but is built around asylum, institution and utility openings rather than classroom security protocol. For lockdown-specific hardware, the BEST 45HCA heavy duty mortise lockbody is offered in an intruder function, the Marks USA LA318GJ is a Grade 1 classroom security indicator mortise lockset with ANSI strike and steel escutcheon for 1-3/4 inch doors, and the TownSteel FME-4000 is a Grade 1 heavy duty electronic intruder classroom mortise lockset with RFID. The indicator on the LA318GJ is what distinguishes it - staff can confirm the lock state without opening the door.
13) Our doors are 1-5/8 inch - can I still use the Sargent 8257?
The Sargent 8257 is built for 1-3/4 inch doors. For thinner doors, the Alarm Lock Trilogy line covers 1-5/8 to 1-7/8 inch: the DL2700CR is a Grade 1 classroom function electronic mortise lock with a weatherproof design, and the DL3500CR is a Grade 1 electronic mortise lock with 300 user codes and classroom function over the same thickness range. Both are electronic keypad locks rather than mechanical keyed privacy, so confirm the function change is acceptable before substituting.
14) Is the Sargent 8257 heavy duty enough for a high traffic behavioral health or school corridor?
It is a heavy duty Grade 1 commercial lock, and Sargent ran the 8200 body through UL Cycle Above and Beyond testing to 16 million cycles. For traffic volume that is as much as the category offers. One caution for behavioral health: the 8257 uses standard lever trim, so if the opening needs anti-ligature hardware, a ligature resistant set such as the TownSteel MRX-L or MRX-A, or the Marks USA 5PDN hospital push/pull paddleset, is the right call instead.
15) Which rose size should I order if I am replacing an older lock and want to cover the existing holes?
Pick the rose by what is already cut in the door face. The 8257 takes an LN rose at 2 inches, an O rose at 2-3/4 inches, an E rose at 3-1/16 inches, or an L rose at 3-1/2 inches. Larger roses cover more, so if the outgoing trim left a scar or an oversize hub hole, the E or L rose hides it. Escutcheon trim is the other route if the door face is badly marked.
16) What is a comparable Grade 1 mortise lock if I do not need the keyed institutional privacy function?
Depends what the door has to do. For a straightforward locked room, the Cal-Royal NM8080 is a 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 in the 8800 Series. For a classroom opening, the Corbin Russwin ML2003 is a Grade 1 mortise classroom lockset for 1-3/4 inch doors. None of those give you the key override over an inside privacy lock that the 8257 does.
17) Is there a keyless or keypad alternative to the Sargent 8257 for a privacy opening?
The 8257 is keyed and uses a standard, less cylinder, or small/large format interchangeable core prep. If you want to drop keys on the opening, the Schlage CO-100-MS-40-KP is a standalone electronic mortise lock in privacy function with a keypad reader, Grade 1 heavy duty, for 1-3/4 inch doors. The Dormakaba E-Plex 2066 is an electronic pushbutton keyless mortise lock for wide stile doors, and the BEST 45HZ EZ Series is an electronic keypad mortise lock with key override if you want to keep a mechanical key path.
18) What is the difference between the Sargent 8257 and a storeroom mortise lock like the Accentra 8805FL?
They control the door from opposite ends. The Sargent 8257 is an institutional privacy function - the occupant side controls access to the room, typical of asylum, institution and utility openings. The Accentra 8805FL is a Grade 1 storeroom function from the 8800 Series, where the outside lever is always locked and a key retracts the latch. Cal-Royal's NM8080 is another Grade 1 storeroom mortise lockset with an interchangeable core option for 1-3/4 inch doors. Storeroom is the right function for closets and mechanical rooms; it will not give you the privacy control the 8257 provides.
19) Can I use a passage mortise lock in place of the Sargent 8257?
Only if the opening does not actually need to lock. The 8257 is a keyed single cylinder institutional privacy lock. Passage mortise bodies such as the Falcon MA101, a Grade 1 heavy duty fire rated passage lock with field reversible operation, the Schlage PM010 Grade 1 non-keyed passage latch mortise lock for 1-3/4 inch doors, and the Hager 3810S Grade 1 passage mortise with rose and 2-3/4 inch backset, latch the door but give no locking control at all. They are a latching substitute, not a functional one.
20) Is a mortise deadbolt an alternative to the Sargent 8257 for securing a room?
A deadbolt secures but does not latch, so it is an addition rather than a replacement. The 8257 is a latching institutional privacy mortise lock with lever trim. The Kaba Ilco 185 Series is a no-handing mortise deadbolt, and the Alarm Lock DL4500 is a Grade 1 electronic mortise deadbolt with 2,000 user codes and a privacy keypad for doors 1-5/8 to 1-7/8 inch. If the door needs both a latch for normal use and a bolt for security, you are looking at two devices or an 8200 function that combines them, not a deadbolt on its own.
21) What looks like a mortise substitute for the Sargent 8257 but will not fit the same door prep?
Watch for three. The Schlage PC10 is a Grade 1 passage lock but it is cylindrical, so it needs a bored door prep rather than the mortise pocket the 8257 requires. The Codelocks CL2255 is a medium duty electronic tubular mortise latch, a lighter class of device than a Grade 1 heavy duty mortise lock body. And the Falcon MESC600DT is dummy escutcheon lever trim for M9900 exit devices - trim only, with no lock body behind it. None of those three will drop into an 8200 mortise opening.
22) If I want a wireless or mobile credential mortise lock instead of the mechanical Sargent 8257, what are the options?
The 8257 is a mechanical keyed lock with no electronics. For credentialed openings, the Schlage LEMD-GRW is a Grade 1 ENGAGE Series wireless mortise lock with a 125kHz proximity reader and mobile enabled deadbolt with LED on Greenwich trim, right hand, rated 3 hours fire. The Alarm Lock DL1300NW is a Trilogy Networx wireless electronic mortise lock with keypad for Adams Rite deadlatches. The Accentra NTM623-NR is a Grade 1 nexTouch mortise lock with a capacitive touchscreen keypad and cylinder override, no deadbolt. Note the LEMD is supplied handed, unlike a mechanical lock body you can field reverse.
23) Is the Schlage LE mobile-enabled mortise lock an equal substitute for the Sargent 8257 on a privacy opening?
They differ in grade. The Sargent 8257 is ANSI/BHMA Grade 1 heavy duty. The Schlage Electronics LEBMB-ADD is a mobile-enabled mortise lock covering privacy, office and apartment functions with a push button and LED, rated Grade 2 for 1-3/4 inch doors with a 3 hour fire rating. If the spec calls for Grade 1 on the opening, the Grade 1 LEMD-GRW in the ENGAGE Series is the closer electronic equivalent.
24) What finishes does the Sargent 8257 come in if I need to match existing hardware across a building?
Sixteen finishes are offered on the 8257: 03 bright brass, 04 satin brass, 09 bright bronze, 10 satin bronze, 10B dark oxidized satin bronze oil rubbed, 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 suede and WSP white suede powder coat. Most institutional standardization lands on 26D or 32D.
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Does the Sargent 8257 EA 26D come with a warranty?
Absolutely. The Sargent 8257 EA 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 8257 EA 26D?
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