Sargent 8252-ET Grade 1 Securi...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$2,185.71
$1,231.15
Sargent Sargent 8200 Series - (8252) Security Deadbolt Function Escutcheon Trim, Heavy Duty Double Cylinder with Deadbolt Mortise Lock, Grade 1 SGT-8252-ET

Sargent 8252-ET Grade 1 Security Deadbolt Mortise Lock with Heavy Duty Double Cylinder and EcoFlex Technology

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Model: 8252 LE1A 15
From the 8200 Series Collection
$2,185.71
$1,231.15
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$2,185.71
$1,231.15
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Sargent 8200 Series Grade 1 Security Deadbolt Mortise Lock with EcoFlex Technology 12-24VDC

Industry Benchmark Mortise Lock with Maximum Security and Performance

The Sargent 8200 Series mortise lock represents the industry benchmark for maximum security, performance, and durability in commercial door hardware. This Grade 1 security deadbolt function features heavy-duty double cylinder construction with 2 3/4" backset depth and 1 3/4" door thickness compatibility. The electromechanical version operates from 12 to 24VDC with patented 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

  • Door Compatibility: Designed for 1 3/4" door thickness with standard 2 3/4" backset for versatile commercial installation applications.
  • Industry-Leading Durability: UL Cycle Above and Beyond test completed at 16 million cycles (Verification ID: V584148) for exceptional longevity in high-traffic commercial applications.
  • Flexible Power Options: Operates from 12 to 24VDC with patented EcoFlex technology that reduces power consumption up to 96% for energy-efficient operation.
  • Heavy-Duty Construction: Grade 1 security deadbolt function with heavy-duty double cylinder construction provides maximum resistance against vandalism and unauthorized entry.
  • Universal System Compatibility: Integrates with all SARGENT key systems including Degree, Signature, KESO, and XC for comprehensive access control flexibility.
  • Fire-Rated Performance: UL 10C positive pressure fire-rated up to 3 hours with NFPA 80 compliance for critical life safety applications.
  • Field-Reversible Configuration: Field-reversible handing reduces inventory requirements and simplifies installation for various door configurations.
  • 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 12 to 24VDC voltage and current capacity before proceeding with electromechanical functions.
  2. Disconnect power supply before beginning installation. Follow all applicable electrical codes and safety procedures.
  3. Mount the mortise lock body in the specified door preparation ensuring proper alignment with 2 3/4" backset and 1 3/4" door thickness requirements.
  4. Route and connect wiring according to manufacturer wiring diagrams for electromechanical functions. Use appropriate wire gauge and connectors for the application.
  5. Configure operational settings including field-reversible handing and any electromechanical functions per application requirements.
  6. Restore power and test all functions including normal operation, deadbolt engagement, electromechanical features, and integration with connected access control 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 and Warehouse Facilities
  • Multi-Tenant Residential Properties
  • Fire-Rated Door 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 demonstrates the manufacturer's confidence in long-term performance. Engineered for demanding commercial applications where maximum security, fire safety compliance, and dependable operation are essential.

Product Specs

Series:
8200 Series
Grade:
Grade 1
Keyed Function:
Double Cylinder
Product Group:
Mechanical Locks
Product Subgroup:
Bored Locksets
Subcategory:
Bored Locksets
Keyed:
Yes
Commercial/Residential:
Commercial
Lock Type:
Mortise
Lock Function:
Security Deadbolt
Product Type:
Mortise Locks
Duty Level:
Heavy Duty
Handle Type:
Lever
Product Attribute:
Mortise Locks
Electronic:
No
Product Function:
Security Deadbolt
Product Category:
Mechanical Locks
Collection:
8200 Series
Department:
Door Hardware

Sargent 8252 LE1A 15 – Frequently Asked Questions

1) Will the Sargent 8252 mortise lock fit a 1-3/4 inch door with a 2-3/4 inch backset?
That is exactly the prep it is built for. The 8252 security deadbolt mortise lock is specified for 1-3/4 inch door thickness with a 2-3/4 inch backset, which is the standard commercial mortise pocket. Thinner or thicker doors need a different lock. Sargent publishes an installation template for the 7800 and 8200 series with all sectional rose and escutcheon trims, so you can mark the pocket, cross-bores and trim holes before you cut.
2) What does the 8252 security deadbolt function actually do, and is there a latch?
The 8252 is a deadbolt-only function: a heavy duty double cylinder deadbolt operated by key from both sides. There is no latchbolt and no free-turning lever retracting a latch, so it is a security bolt for an opening where you want positive key control on both faces. If you need a latching lockset that people can walk through, pick a storeroom, office or classroom function instead, such as the Cal-Royal NM8080 storeroom or the Corbin Russwin ML2003 classroom mortise.
3) Is this Sargent mortise lock fire rated for a 3 hour opening?
Yes. The 8200 Series mortise lock is UL 10C positive pressure fire rated up to 3 hours and compliant with NFPA 80, so it can go on a labeled fire door assembly rated to that level. It also carries ANSI/BHMA A156.13 Series 1000 Grade 1 certification.
4) Do I have to order cylinders separately for the Sargent 8252?
You choose the cylinder arrangement when you order. Four options: standard cylinder supplied, less cylinder, 70 prep for small format interchangeable core less core, or 60 prep for large format interchangeable core less core. Because the 8252 is a double cylinder deadbolt, an IC prep or less-cylinder choice means you are supplying two cores or cylinders. Keying is specified alongside it as keyed different, keyed alike, or to a key code you provide; pick the None keying option if you are going less cylinder.
5) Can I key this Sargent deadbolt into the master key system already in my building?
If the building is on Sargent, yes. The 8200 Series works with all Sargent key systems including Degree, Signature, KESO and XC. For a different manufacturer's system, order it with the 70 small format or 60 large format interchangeable core prep less core and drop in cores from your existing system.
6) Is the Sargent 8252-ET an electrified lock, and what voltage does the electromechanical 8200 run on?
The 8252-ET as configured is a mechanical lock, not an electronic one. Within the 8200 Series, the electromechanical versions operate on 12 to 24VDC and use Sargent's patented EcoFlex technology, which cuts power draw by up to 96 percent. If you specifically need a wired mortise lock tied to an access control panel, the BEST 45HW wired electromechanical mortise runs 12V/24V, and the Command Access ML190 is a motorized mortise with field selectable fail safe or fail secure on 24VDC.
7) If I need a mortise deadbolt but want keypad access instead of keyed cylinders, what should I use instead of the Sargent 8252?
The Sargent 8252 is a mechanical deadbolt operated by a heavy duty double cylinder, with no electronic credential. For keypad-based deadbolt control, the Alarm Lock DL4500 is a Grade 1 electronic mortise deadbolt with 2,000 user codes and a privacy keypad, fitting doors 1-5/8 to 1-7/8 inch. The Schlage Electronics LEMD-GRW is a Grade 1 ENGAGE wireless mortise deadbolt with a 125kHz proximity reader and mobile credentials, with a 3 hour fire rating.
8) What mortise lock takes the place of the Sargent 8252 on an electrified access control opening?
The 8252 is a mechanical security deadbolt with no electrical function. For an electrified mortise opening, 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 fail safe or fail secure operation on 24VDC in a 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 and 12/24VDC operation for 1-3/4 inch doors.
9) We need double cylinder entry on an ornamental iron door. Will the Sargent 8252 work, or is there a better fit?
The Sargent 8252 is built for 1-3/4 inch commercial doors, so it does not suit a narrow iron stile. The Marks USA 21AC is an entrance double cylinder Unilock ornamental iron mortise lock with a round knob for 1 inch doors, and the Marks USA 22AC is an entrance double cylinder ornamental iron mortise lock, also with a round knob, for 1 inch doors.
10) Our doors are 1-5/8 inch. Is the Sargent 8252 still the right mortise lock?
The Sargent 8252 is specified for 1-3/4 inch door thickness. For thinner doors, the Alarm Lock DL2700CR classroom mortise lock and DL3500CR Grade 1 classroom mortise lock both cover 1-5/8 inch to 1-7/8 inch, as does the DL4500 Grade 1 electronic mortise deadbolt. Those are keypad electronic locks rather than a keyed double cylinder deadbolt, so confirm the function you need before ordering.
11) Do I need to order left hand or right hand for the Sargent 8200 mortise lock?
No handing call-out is needed. The 8200 Series lock body is field reversible, so one part number covers left and right hand openings. That also means a property manager can stock one lock for the whole building instead of two.
12) What trim and lever choices come with the Sargent 8252 escutcheon version?
The ET version uses escutcheon trim in four styles, LE1, LS, LW1 and WT, with eight lever designs to choose from: A, B, E, F, J, L, P and W. Sixteen finishes are offered, from 03 bright brass and 04 satin brass through 26D satin chrome, 32D satin stainless, 10B oil rubbed bronze, and BSP black or WSP white suede powder coat. Match the escutcheon and finish to the other openings on the floor so the corridor reads consistently.
13) Is this Sargent lock durable enough for a high traffic entrance in a school or hospital?
It is built for that duty. The 8200 Series completed UL's Cycle Above and Beyond test at 16 million cycles, verification ID V584148, and it is a heavy duty, commercial Grade 1 mortise lock. Typical applications are commercial office, education, healthcare, government, industrial and multi-tenant residential openings, including fire rated doors.
14) I need a keypad deadbolt instead of a keyed one. What are my options in a mortise deadbolt?
The Sargent 8252 is key operated on both sides with no code entry. For pushbutton access on a mortise deadbolt, the Alarm Lock DL4500 Series is a Grade 1 electronic mortise deadbolt with 2,000 user codes and a privacy keypad, fitting 1-5/8 to 1-7/8 inch doors. Note the thickness difference: the DL4500 will not suit a 1-3/4 inch door prep at the thinner end of its own range the way the Sargent is fixed at 1-3/4 inches.
15) What is the difference between the Sargent 8252 deadbolt and a Grade 1 storeroom mortise lockset?
Function, not quality. The 8252 is a deadbolt-only lock with cylinders on both faces, for securing an opening rather than for daily passage. A storeroom mortise such as the Accentra 8805FL, Grade 1 in the 8800 Series, has a latchbolt that stays locked from outside and releases with a key while the inside lever always allows egress. On a door people use all day you want the storeroom function; on a door you want bolted from both sides, the 8252.
16) What is the difference between the Sargent 8252 and the Cal-Royal NM8050 for an office entrance?
The Cal-Royal NM8050 is a Grade 1 heavy duty office/entrance mortise lockset with an auxiliary deadlatch for 1-3/4 inch doors, giving keyed latch entry at the lever. The Sargent 8252 is a Grade 1 heavy duty security deadbolt with a heavy duty double cylinder, so it throws a deadbolt keyed from both sides rather than operating a latch. A comparable non-keyed office option is the Hager 3850E Grade 1 office mortise lock with lever and escutcheon on a 2-3/4 inch backset for 1-3/4 to 2-1/2 inch doors.
17) Is a Kaba Ilco 185 mortise deadbolt a substitute for the Sargent 8252?
Both are deadbolt function mortise products, and the Kaba Ilco 185 Series is catalogued with a deadbolt function and no handing. The difference is scope: the Sargent 8252 is a Grade 1 heavy duty commercial security deadbolt supplied with escutcheon trim in LE1, LS, LW1 or WT and a lever in A, B, E, F, J, L, P or W, ordered with a standard cylinder, less cylinder, or small or large format interchangeable core prep. Confirm the trim and cylinder prep before treating the two as interchangeable.
18) Do I need the Sargent 8252 on a door that only needs to latch, not lock?
No. The 8252 is a keyed security deadbolt with a double cylinder. For an unkeyed opening, the Falcon MA101 is a Grade 1 heavy duty fire rated mortise passage lock with field reversible operation, the Schlage PM010 is a Grade 1 non-keyed passage latch mortise lock for 1-3/4 inch doors, and the Hager 3810E is a Grade 1 passage mortise lock with escutcheon and a 2-3/4 inch backset for doors 1-3/4 to 2-1/2 inch.
19) What mortise lock should I use instead of the Sargent 8252 in a behavioral health room?
The 8252 uses a lever handle with escutcheon trim, which is not a ligature resistant configuration. For patient areas, 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, the MRX-A-01 is the same passage function with satin stainless ligature resistant arch trim, 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.
20) Can I use an Emtek mortise entrance set in place of the Sargent 8252?
No. The Emtek 3019 Brisbane, 3102 Memphis, 3104 Hamilton and 3106 Manhattan mortise entrance locksets are all dummy function, meaning they are non-operating trim with no bolt. The Sargent 8252 is a Grade 1 keyed security deadbolt with a heavy duty double cylinder, so the two serve entirely different purposes on the door.
21) We want card and mobile credentials on a mortise opening rather than the keyed Sargent 8252. What are the options?
The 8252 is keyed and mechanical. For credential-based mortise openings, the Dormakaba E-Plex E5086 is a Grade 1 entry/egress electronic pushbutton and card back to back mortise lock, the Dormakaba Saffire LX-I-M002 is an electronic RFID mortise lockset with BLE mobile access at BHMA Grade 2, and the TownSteel FME-2000 is a Grade 1 heavy duty classroom mortise lockset with RFID for 1-3/4 inch doors.
22) For a privacy or restroom door, what mortise lock do I order instead of the Sargent 8252 double cylinder deadbolt?
A double cylinder security deadbolt like the Sargent 8252 is keyed on both sides and is not a privacy function. For bed, bath and restroom doors, 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 to 2 inch.
23) Is a BEST 45H mortise lock body a drop-in alternative to the Sargent 8252?
They are different functions. The BEST 45HCAC is a heavy duty mortise lock body with public entrance function and field reversible operation, and the 45HCAINL is a heavy duty mortise lockbody with intruder function. The Sargent 8252 is a Grade 1 heavy duty security deadbolt, also field reversible, supplied with escutcheon trim and a lever. Match the function code to the opening rather than assuming the bodies interchange.
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Does the Sargent 8252 LE1A 15 come with a warranty?
Absolutely. The Sargent 8252 LE1A 15 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 8252 LE1A 15?
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