Sargent 4877-LC Classroom Mort...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$400.04
$242.86
Sargent 4877-LC Classroom Mortise Deadbolt with 2-3/4" Backset - Less Cylinder

Sargent 4877-LC Classroom Mortise Deadbolt with 2-3/4" Backset - Less Cylinder

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Model: 4877-26D-LC
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$400.04
$242.86
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Sargent 4877 Series Classroom Mortise Deadbolt with 2-3/4" Backset and 1" Throw - Less Cylinder

Professional Classroom Security Solution

The Sargent 4877 Series Classroom Mortise Deadbolt delivers maximum security and durability for high-traffic educational facilities. This UL Listed deadbolt features laminated stacked steel construction with a 2-3/4" backset and 1" latchbolt throw, designed specifically for 1-3/4" door thickness applications. The cylinder x thumb turn configuration provides secure key-operated access from outside while allowing interior thumb turn retraction without projection capability.

Professional Features & Benefits

  • Precise Door Compatibility: Engineered for 1-3/4" door thickness with 2-3/4" backset depth for standard commercial door applications.
  • Heavy-Duty Construction: Laminated stacked steel deadbolt provides maximum security and performance for demanding institutional environments.
  • Classroom Function Design: Key outside operates deadbolt while thumb turn inside retracts but will not project deadbolt for enhanced classroom security protocols.
  • Non-Handed Installation: Universal design eliminates handing requirements for simplified inventory management and installation flexibility.
  • UL Listed Certification: UL and ULC Listed for fire safety compliance and code requirements in commercial applications.
  • High-Traffic Durability: Specifically designed for schools, hospitals, and other high-traffic facilities requiring reliable long-term performance.
  • Manufacturer Warranty: 1-year limited warranty provides added confidence and protection for institutional investments.

Technical Specifications

  • Refer to manufacturer documentation for complete technical specifications.

Installation & Operation

  1. Review manufacturer specifications and verify door preparation requirements including door thickness, stile width, and handing as applicable to this product.
  2. Use manufacturer-provided templates to mark mounting hole locations accurately on door and/or frame surfaces.
  3. Prepare door and frame by drilling required holes and routing as specified in manufacturer instructions.
  4. Install all mounting hardware and secure the device to door and frame per manufacturer torque specifications.
  5. Adjust operational components for proper alignment, latching, and smooth operation throughout the full range of motion.
  6. Test device operation to verify proper function and make final adjustments as needed. Refer to manufacturer documentation for complete installation details and troubleshooting.

Professional Applications

  • Educational Facilities and Classrooms
  • Healthcare Institutions
  • Commercial Office Buildings
  • Government and Municipal Buildings
  • Multi-Tenant Residential Properties
  • Industrial and Warehouse Facilities
  • Retail Establishments

Why Choose Sargent Quality?

Sargent mortise deadbolt products deliver professional-grade reliability with laminated stacked steel construction and UL Listed certification for demanding commercial applications. The 1-year limited warranty and proven performance in high-traffic facilities like schools and hospitals demonstrate Sargent's commitment to institutional security needs. Engineered for dependable performance where maximum security and durability are essential.

Product Specs

Series:
4870 Series
Product Group:
Mechanical Locks
Product Subgroup:
Mortise Locks and Trim
Product Type:
Mortise Locks
Subcategory:
Mortise Locks and Trim
Commercial/Residential:
Commercial
Lock Function:
Classroom
Keyed Function:
Less Cylinder
Lock Type:
Deadbolt
Product Model:
4877
Product Function:
Classroom
Product Category:
Mechanical Locks
Department:
Door Hardware

Sargent 4877-26D-LC – Frequently Asked Questions

1) Does the Sargent 4877 come with a cylinder?
No, it ships less cylinder. You order the mortise cylinder separately, which lets you match your existing Sargent keyway and keying system rather than being stuck with a factory key section. Budget for a mortise cylinder with the correct cam and length for a 1-3/4 inch door plus whatever trim ring or collar you need to get the right projection.
2) What backset and bolt throw does the Sargent 4877 have, and will it hit my existing strike?
Backset is 2-3/4 inches with a 1 inch deadbolt throw. Standard 2-3/4 inch commercial mortise prep takes it directly. The 1 inch throw needs a strike pocket deep enough to accept a full inch of bolt, so if you are dropping this into an existing frame with a shallow latch strike, expect to change the strike. It ships with a 3-1/2 x 1-1/8 inch strike (480).
3) Is the Sargent 4877 a complete lockset or just a deadbolt?
Deadbolt only. There is no latchbolt, no lever, no knob. It is a mortise deadbolt body used as auxiliary security alongside a latching lockset, or on a door where a separate deadbolt is wanted. If you need one lock that both latches the door and gives classroom key control, look at a full classroom mortise lockset like the Corbin Russwin ML2003 or the Cal-Royal NM8070 instead.
4) What is the closest alternative to the Sargent 4877 classroom mortise deadbolt if I need a latch and lever on the same door instead of a deadbolt only?
The Sargent 4877 is a classroom-function mortise deadbolt, less cylinder, so it secures the opening with a bolt only and carries no latch or lever trim. If the opening needs a keyed classroom lockset with operating trim, the Corbin Russwin ML2003 is a Grade 1 mortise classroom lockset for 1-3/4 inch doors, and the Cal-Royal NM8070 is a Grade 1 classroom mortise lockset with an auxiliary deadlatch, also for 1-3/4 inch doors. Either of those handles latching and free egress through a lever, where the 4877 is used as the deadbolt portion of the opening.
5) Is there an electronic mortise deadbolt I can use in place of the Sargent 4877 to get keypad access without issuing keys?
Yes. The Sargent 4877 is key operated from the outside and needs a cylinder ordered separately, since it ships less cylinder. If you want code-based access instead, 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 thick. That swaps key control for code management, which suits facilities with frequent staff turnover.
6) We want classroom lockdown from inside the room rather than keying the Sargent 4877 from the corridor. What should we look at?
The Sargent 4877 is keyed from the outside, with the inside thumb turn able to retract but not project the bolt, so lockdown is performed from the corridor side. For inside-the-room lockdown, the BEST 45HCA heavy duty mortise lockbody uses an intruder function, and the TownSteel FME-4000 is a Grade 1 heavy duty electronic intruder classroom mortise lockset with RFID for 1-3/4 inch doors. Both are built around securing the door from within the classroom.
7) Our doors are 1-5/8 inch, not 1-3/4 inch. What classroom mortise option fits instead of the Sargent 4877?
The Sargent 4877 is built for 1-3/4 inch door thickness with a 2-3/4 inch backset. For thinner doors, the Alarm Lock DL2700CR Trilogy T2 is a Grade 1 classroom-function electronic mortise lock rated for 1-5/8 to 1-7/8 inch doors, and the DL3500CR is a Grade 1 classroom electronic mortise lock over the same 1-5/8 to 1-7/8 inch range with 300 user codes. Both are keypad devices rather than key-and-turn deadbolts.
8) Can I use the Sargent 4877 deadbolt on a fire rated classroom door?
The 4877 is UL and ULC Listed. Note the function though: on a fire door the bolt must not be projected in a way that defeats egress, and this deadbolt is key operated from the corridor side with an inside thumb turn that retracts only. Verify your opening's listing paperwork and door label against the assembly you are building.
9) I want classroom lockdown with a keypad instead of a key. What else could I use?
The 4877 is strictly mechanical and key operated. For electronic classroom function on a 1-3/4 inch door, the TownSteel FME-2000 is a Grade 1 classroom mortise lockset with RFID, and the FME-4000 adds intruder classroom function with RFID. Alarm Lock's DL3500CR is a Grade 1 Trilogy classroom mortise lock with 300 user codes, though it takes a 1-5/8 to 1-7/8 inch door. Those are locksets, not deadbolts, so they latch the door as well.
10) Is there a mortise deadbolt option if I do not need classroom function?
If you just want a straight keyed deadbolt without the retract-only thumb turn behavior, the Kaba Ilco 185 Series is a non-handed mortise deadbolt. The Alarm Lock DL4500 is a Grade 1 electronic mortise deadbolt with keypad privacy and 2,000 user codes for 1-5/8 to 1-7/8 inch doors. The 4877's value is specifically that the inside turn cannot throw the bolt.
11) Can I standardize the Sargent 4877 across a whole school or hospital?
That is what it is built for. It is non-handed so one part number covers every opening regardless of swing, it takes the standard 2-3/4 inch mortise backset, and being less cylinder it drops into whatever master key system the facility already runs. Just confirm every door in the program is 1-3/4 inches thick, because that is the only thickness it fits.
12) Can I use a storeroom mortise lock instead of the Sargent 4877 classroom deadbolt?
They control access differently. The Sargent 4877 is a classroom-function deadbolt: the outside key throws and retracts the bolt, and the inside turn can only retract it. A storeroom lockset such as the Accentra 8805FL, a Grade 1 storeroom mortise lock with Arcadia lever, or the Cal-Royal NM8080 Grade 1 storeroom mortise lockset for 1-3/4 inch doors, keeps the outside trim locked at all times with key entry and free inside egress. Storeroom suits a door that must never be left unsecured; classroom suits a door staff need to leave unlocked during occupancy.
13) What looks like a substitute for the Sargent 4877 mortise deadbolt but is not?
Several mortise products sit in the same door prep family without doing the same job. The Kaba Ilco 185 Series mortise lock is a non-handed deadbolt function, which is the nearest in concept, while the Cal-Royal NM8440 is a Grade 1 privacy mortise lockset with a deadbolt for 1-3/4 inch doors - that bolt is thumb-turn privacy, not keyed classroom control. The Schlage PM010 is a Grade 1 non-keyed passage mortise latch with no bolt at all. The Sargent 4877 is a keyed classroom deadbolt whose inside turn retracts but cannot project the bolt, so none of those three reproduce its operation.
14) Is there an RFID or credential-based classroom mortise lock to standardize on instead of keying the Sargent 4877?
The Sargent 4877 is a mechanical classroom deadbolt supplied less cylinder, so it ties into an existing key system. If the campus is moving to credentials, the TownSteel FME-2000 is a Grade 1 heavy duty mortise lockset with RFID and classroom function for 1-3/4 inch doors, and the Dormakaba Saffire LX-I-M002 is an electronic RFID mortise lockset with BLE mobile access at BHMA Grade 2. Those let you revoke a credential centrally rather than rekeying cylinders.
15) What finish does the Sargent 4877 classroom deadbolt come in?
26D, satin chromium plated over nickel. That is the satin chrome look that matches the vast majority of commercial lever trim and exit hardware already hanging in schools and hospitals, so it blends with existing openings without a finish mismatch.
16) What is the bolt itself made of on the Sargent 4877?
Laminated stacked steel. Laminated construction resists sawing and shear better than a cast bolt, which is why this one gets specified for schools and hospitals where the door takes abuse year after year.
How fast can I get the Sargent 4877-26D-LC delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Sargent 4877-26D-LC come with a warranty?
Absolutely. The Sargent 4877-26D-LC 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 4877-26D-LC?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
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