Sargent NAC82271 Heavy Duty Mo...
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$1,296.06
Sargent NAC 8200 Series - (NAC82271) Fail Secure w/ Cylinder Override, Heavy Duty Single Cylinder Mortise Lock, Grade 1

Sargent NAC82271 Heavy Duty Mortise Lock with Fail Secure Cylinder Override - Grade 1

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Model: NAC82271-24V EB 10B
$2,530.11
$1,296.06
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$2,530.11
$1,296.06
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Sargent NAC 8200 Series Heavy Duty Mortise Lock with Fail Secure Cylinder Override and EcoFlex Technology - Grade 1

Industry Benchmark Mortise Lock with Maximum Security and Performance

The Sargent NAC 8200 Series represents the industry benchmark for mortise locks, delivering maximum security, performance, and durability through high-quality components and patented design. This heavy-duty single cylinder mortise lock features fail secure operation with cylinder override, Grade 1 operational rating, and operates from 12 to 24VDC with EcoFlex technology that reduces power consumption up to 96%. The multi-functional lock body accommodates 1 3/4" door thickness with 2 3/4" backset and 3/4" latchbolt throw for reliable commercial applications.

Professional Features & Benefits

  • Door Compatibility: Designed for 1 3/4" door thickness with 2 3/4" backset and 3/4" latchbolt throw for standard commercial door applications.
  • Exceptional Durability Testing: UL Cycle Above and Beyond test completed at 16 million cycles (Verification ID: V584148) for unmatched reliability in high-traffic applications.
  • Advanced Power Management: EcoFlex technology operates from 12 to 24VDC with up to 96% power consumption reduction and 89% energy savings on electromechanical functions.
  • Fail Secure with Cylinder Override: Field-configurable fail-secure operation with manual cylinder override capability for emergency access and operational flexibility.
  • Grade 1 Construction: ANSI/BHMA A156.13 Series 1000 Operational Grade 1 rating with UL 10C Fire-Rated up to 3 hours and NFPA 80 compliance for commercial-grade performance.
  • Universal Key System Integration: Integrates with all SARGENT key systems including Degree, Signature, KESO, and XC for comprehensive access control compatibility.
  • Multi-Functional Design: Available in 56 different functions including electromechanical, security and monitoring options with field-reversible handing for versatile installation.
  • 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 fail-secure operation per application requirements.
  6. Restore power and test all functions including normal operation, cylinder override, 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 Building Security Systems
  • Healthcare Facility Access Control
  • Educational Institution Safety Systems
  • Government and Municipal Buildings
  • Industrial Facility Monitoring
  • Multi-Tenant Residential Properties
  • Emergency Exit Compliance

Why Choose Sargent Quality?

Sargent NAC 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 comprehensive protection. Engineered for demanding commercial applications 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:
Fail Secure w/ Cylinder Override
Product Type:
Mortise Locks
Duty Level:
Heavy Duty
Handle Type:
Lever
Segment:
Door Hardware
Product Attribute:
Mortise Locks
Electronic:
Yes
Product Function:
Fail Secure w/ Cylinder Override
Product Category:
Mechanical Locks
Department:
Door Hardware

Sargent NAC82271-24V EB 10B – Frequently Asked Questions

1) Will the Sargent NAC 8200 mortise lock fit a 1-3/4 inch door with a 2-3/4 inch backset?
That is exactly what the NAC 8200 lock body is built around: 1-3/4 inch door thickness with a 2-3/4 inch backset, which is the standard commercial prep. The latchbolt throws 3/4 inch. If your openings are thicker than 1-3/4 inches, this is not the right body for them.
2) Does the Sargent NAC 8200 run on 12V or 24V, and do I pick one when ordering?
Voltage is an ordering choice, not a field setting: the lock is built as either 12V or 24V. It runs on DC in that 12 to 24VDC range with EcoFlex, which cuts power draw substantially, so a single supply can carry more openings than an older electrified mortise line would. Confirm the supply you already have in the closet before you pick the axis.
3) Is the Sargent NAC 8200 fire rated for a 3 hour opening?
UL 10C fire rated up to 3 hours and NFPA 80 compliant, with an ANSI/BHMA A156.13 Series 1000 Operational Grade 1 rating. That covers stair and corridor openings in healthcare, education, and government work where a 3 hour label is on the drawing.
4) Do I have to order a cylinder with the Sargent NAC 8200, or can I use my own core?
Cylinder is a required selection with four ways to go: standard cylinder, less cylinder, 70 prep for a small format interchangeable core less core, or 60 prep for a large format interchangeable core less core. If your building is already on an SFIC or LFIC system, take the 70 or 60 prep and drop in your own cores. Keying is a separate required choice: keyed different, keyed alike, a specific key code, or none if you went less cylinder. It is a single cylinder lock, and it works with the Sargent Degree, Signature, KESO, and XC key systems.
5) Do I need to specify handing on a Sargent 8200 mortise lock?
No. The 8200 body is field reversible, so one part number covers left and right hand openings and you can flip it on site. That matters when you are standardizing a floor and do not want to track handing per door. What you do have to call out is lever style, rose, finish, and voltage.
6) Can I use the Sargent 8200 on doors thicker than 1-3/4 inches, like a heavy exterior wood door?
No. The 8200 body is specified at 1-3/4 inch door thickness. For thicker stock, the Hager 3800 Series mortise locks cover 1-3/4 inch up to 2-1/2 inches, and the Baldwin 6301 and 6310 bodies are listed for 1-3/4 inch and over and 1-3/8 inch and over respectively on a 2-1/2 inch backset. Those are mechanical bodies, though, so you lose the electrified function.
7) Will an electrified mortise lock like the Sargent 8200 work on an aluminum storefront door?
No. This is a wide-body mortise lock cut for a 1-3/4 inch door with a 2-3/4 inch backset, which is hollow metal or wood, not a narrow aluminum stile. For storefront, the Alarm Lock DL1300NW Trilogy Networx wireless keypad lock is built for Adams Rite deadlatches, and the Dormakaba E-Plex 2066 is a wide stile pushbutton mortise. Check the stile before you order either way.
8) What is the closest Grade 1 wired electromechanical mortise lock to the Sargent NAC82271 if I need another brand for the same 12/24VDC opening?
The BEST 45HW is a heavy duty wired electromechanical mortise lock with 12V/24V operation, so it covers the same wired-power mortise opening as the NAC82271, which is a Grade 1 electronic mortise lock with fail secure and cylinder override running on 12 to 24VDC. The Schlage 03A electric lock/unlock outside lever mortise lock is another heavy duty wired option at 12/24VDC, keyed outside with request to exit, on a 1-3/4 inch door. The NAC82271 keeps its own cylinder override function; the Schlage is a corridor function and the BEST 45HW is supplied as a wired lock body series, so confirm the function you need before swapping.
9) I do not have power at the door - what mortise lock should I use instead of the Sargent NAC82271?
The NAC82271 is an electronic mortise lock that needs 12 to 24VDC at the opening. Where there is no power run, a mechanical Grade 1 mortise lockset covers the same door: the Accentra 8805FL is a Grade 1 storeroom mortise lock with an Arcadia lever, the Cal-Royal NM8080 is a Grade 1 storeroom mortise lockset with an interchangeable core option on a 1-3/4 inch door, and the Corbin Russwin ML2003 is a Grade 1 mortise classroom lockset on a 1-3/4 inch door. These are key-operated only, with no electric release, so access control at the frame would have to move to the strike or the door position side.
10) Can a keypad mortise lock replace the Sargent NAC82271 on a standalone door with no access control panel?
It can, but the credential moves from the panel to the lock. The NAC82271 is a wired 12 to 24VDC lock that is released by the access control system, with a cylinder override at the door. A standalone alternative is the BEST 45HZ EZ Series electronic keypad mortise lock with key override, or the Alarm Lock DL3500CR Trilogy Grade 1 electronic mortise lock with 300 user codes and classroom function for 1-5/8 to 1-7/8 inch doors. The Dormakaba E-Plex 2066 is an electronic pushbutton keyless mortise lock for wide stile doors. With these, codes are managed at the lock rather than by the head-end, so there is no wiring to pull but also no central lock/unlock command.
11) What is the difference between the Sargent NAC82271 and a fail safe electric mortise lock?
The NAC82271 is fail secure with cylinder override, so the lock stays locked when power is lost and the key cylinder is the way in. If the opening needs the other behavior, or you want to decide on site, the Command Access ML190 is a heavy duty motorized mortise lock with field selectable EL/EU operation on 24VDC in a storeroom function, so the same body can be set electrically locked or electrically unlocked. The Schlage 03A is an electric lock/unlock outside lever mortise lock at 12/24VDC in a corridor function with request to exit. Check the fire and egress requirement for the opening, since that usually decides which behavior is permitted.
12) Will a Sargent NAC82271 work on a 1-5/8 inch door, and what fits if it will not?
The NAC82271 lock body is built for a 1-3/4 inch door thickness. For a thinner leaf, the Alarm Lock DL2700CR Trilogy T2 electronic mortise lock with classroom function is Grade 1 and covers 1-5/8 to 1-7/8 inch doors in a weatherproof design, and the Alarm Lock DL3500CR covers the same 1-5/8 to 1-7/8 inch range with 300 user codes. Both are keypad locks rather than wired fail secure locks, so the access control method changes with the door.
13) The Sargent NAC82271 is Grade 1 - which electronic mortise locks are not, if my spec calls for Grade 1?
The NAC82271 carries a Grade 1 rating. Among electronic mortise locks, grade varies: the Schlage Electronics LEBMB-ADD mobile-enabled push button lock with LED is Grade 2 for 1-3/4 inch doors with a 3 hour fire rating, and the Dormakaba LX-I-M002 Saffire RFID mortise lockset with BLE mobile access is BHMA Grade 2. If the drawing calls for Grade 1 electronic, the Alarm Lock DL3500CR, the TownSteel FME-4000 electronic intruder classroom lockset with RFID, and the Dormakaba E-Plex E5086 are Grade 1.
14) Is a cylindrical lock a substitute for the Sargent NAC82271 mortise lock?
No. The NAC82271 is a mortise lock, which needs a rectangular pocket machined into the door edge, while a cylindrical lock such as the Schlage PC10 Grade 1 passage cylindrical lock for 1-3/4 inch doors goes into a bored cross hole. The two door preps are not interchangeable in either direction without replacing the door or adding a filler. Match the existing prep before ordering.
15) Will a 3/4 inch latchbolt throw catch my existing ANSI strike?
A 3/4 inch latchbolt throw is the normal commercial mortise figure, so it lands in a standard ANSI strike pocket the way the lock you are pulling out did. What decides the retrofit is the mortise pocket itself: the NAC 8200 body wants a 2-3/4 inch backset prep in a 1-3/4 inch door. Match those and the strike side generally follows.
16) What rose sizes and lever styles does the Sargent 8200 come in, and how do I match the other doors in my building?
Four rose sizes: E rose at 3-1/16 inches (78mm), L rose at 3-1/2 inches (89mm), LN rose at 2 inches (51mm), and O rose at 2-3/4 inches (67mm). Levers are B, L, or P. If you are adding to openings that already carry Sargent trim, match the existing rose diameter and lever letter and the new door reads the same from the hallway. A larger rose is also the easy way to cover an old trim footprint.
17) Is a 16 million cycle rating worth it over a standard Grade 1 mortise lock?
On a high traffic opening, yes. The 8200 completed UL's Above and Beyond cycle test at 16 million cycles (Verification ID V584148), which is far past what the Grade 1 operational threshold requires. On a main entrance, a hospital corridor, or a dorm door that swings hundreds of times a day, that is the difference between a lock body you replace and one you do not. On a back-of-house door that opens twice a shift, a standard Grade 1 mortise like the Cal-Royal NM8080 storeroom or the Corbin Russwin ML2003 classroom will carry the load.
18) What is the difference between a wired electrified mortise lock like the Sargent 8200 and a standalone keypad mortise lock?
The NAC 8200 is a wired lock: it takes 12 to 24VDC from your power supply and is controlled by an access control system, with a key cylinder as the manual override. You get real-time control and the door state lives in the head end. A standalone lock such as the Alarm Lock DL3500CR Trilogy, which holds 300 user codes on board, or the BEST 45HZ EZ keypad mortise with key override needs no wiring at all and is managed at the door. Run wire and you get central control; skip the wire and you manage codes one opening at a time. The BEST 45HW wired electromechanical mortise runs the same 12V/24V way the Sargent does if you want a second wired option.
19) Which mortise locks give me a credential reader at the door instead of a wired fail secure lock like the Sargent NAC82271?
Card and mobile readers built into the lock are a different architecture from the NAC82271, which is a wired 12 to 24VDC fail secure lock with cylinder override. Reader-in-lock options include the Schlage Electronics LEMD-GRW, a Grade 1 ENGAGE Series wireless mortise lock with a 125kHz proximity reader and mobile-enabled deadbolt with LED and 3 hour fire rating; the TownSteel FME-2000, a Grade 1 heavy duty classroom mortise lockset with RFID for 1-3/4 inch doors; and the Dormakaba E-Plex E5086, a Grade 1 back to back pushbutton and card entry/egress mortise lock. The Accentra NTM623-NR nexTouch Generation 3 uses a capacitive touchscreen keypad with cylinder override and no deadbolt.
20) Are the Baldwin 6301 and 6310 mortise lock bodies an alternative to the Sargent NAC82271?
They serve a different opening. The Baldwin 6301 entry/apartment and 6310 entry/storeroom mortise lock bodies use a 2-1/2 inch backset, while the NAC82271 uses a 2-3/4 inch backset with a 3/4 inch latchbolt throw on a 1-3/4 inch door, so the door prep and the trim spacing do not line up. The Baldwin bodies are also mechanical, with no electrical function, where the NAC82271 is an electronic fail secure lock. For a 2-3/4 inch backset mechanical body instead, the Cal-Royal NM8050 office/entrance and NM8070 classroom locksets are Grade 1 for 1-3/4 inch doors.
21) The Sargent NAC82271 costs more than a passage or dummy mortise trim - can I use one of those on the same door?
Only if the door does not need to lock. The NAC82271 is keyed, single cylinder, and electrically controlled. A Schlage PM010 Grade 1 passage latch mortise lock, a Falcon MA101 Grade 1 heavy duty mortise passage lock with field reversible operation and a fire rating, or a Hager 3810S Grade 1 passage mortise lock with rose and 2-3/4 inch backset all latch without locking. A Schlage L0170 half dummy trim has no latch at all. These fit a corridor or closet leaf next to a secured opening, not the secured opening itself.
22) Which mortise locks are not substitutes for the Sargent NAC82271 even though they are called mortise locks?
Several are a different part entirely. The Kaba Ilco 185 Series is a deadbolt function mortise lock with no latch or lever, and the Alarm Lock DL4500 is an electronic mortise deadbolt with a privacy keypad and 2,000 user codes - neither latches a door the way the NAC82271 does. The Emtek 3102 Memphis and 3104 Hamilton are dummy function trims with no working lock. The Codelocks CL2255 is a medium duty electronic tubular mortise latch, and the Marks USA 21AC is an ornamental iron mortise lock for 1 inch material. The NAC82271 is a heavy duty commercial lever lock for 1-3/4 inch doors.
23) What mortise lockset should I use instead of the Sargent NAC82271 in a behavioral health or patient room?
The NAC82271 is a lever lock with a projecting lever and rose trim, which is not the trim style used where ligature resistance is required. The TownSteel MRX-L-01 is a Grade 1 heavy duty anti-ligature lever mortise lockset in stainless steel with a passage function for 1-3/4 inch doors, and the MRX-A-01 is the same passage function with a satin stainless ligature resistant arch trim. 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.
24) The Sargent NAC82271 needs a hardwired power run - what wireless mortise lock covers the same access controlled opening?
The NAC82271 operates on 12 to 24VDC brought to the lock. Where pulling power through the frame is not practical, the Schlage Electronics LEMD-GRW is a Grade 1 ENGAGE Series wireless mortise lock with a 125kHz proximity reader, mobile enabled, with a 3 hour fire rating, and the Alarm Lock DL1300NW is a Trilogy Networx wireless electronic mortise lock with keypad for Adams Rite deadlatches. The Dormakaba PowerPlex P2066 is a mortise lock in the PowerPlex 2000 Series. Wireless locks report to the head-end over a radio link rather than a wired circuit, so the lock schedule and the audit path differ from a wired fail secure lock.
25) What finishes can I get the Sargent 8200 electrified mortise lock in?
Sixteen finishes, covering the usual commercial specs and some that are harder to source: 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. For a facility standardizing on one look, 26D and 32D are the two that match most existing commercial door hardware.
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Absolutely. The Sargent NAC82271-24V EB 10B is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
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