Sargent 4875 Single Cylinder M...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$448.31
$318.92
Sargent 4875 Single Cylinder Mortise Deadbolt with 2-3/4" Backset

Sargent 4875 Single Cylinder Mortise Deadbolt with 2-3/4" Backset

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Model: 4875-26D
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$448.31
$318.92
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Sargent 4875 Series Single Cylinder Mortise Deadbolt with 2-3/4" Backset

Professional Mortise Deadbolt Security Solution

The Sargent 4875 Series Single Cylinder Mortise Deadbolt delivers maximum security with laminated stacked steel deadbolt construction and 2-3/4" backset depth for 1-3/4" door thickness applications. This UL Listed mortise lock features cylinder x thumb turn operation with 1" latchbolt throw and non-handed design for versatile installation. Engineered specifically for high-traffic facilities like schools and hospitals where reliable performance and durability are essential.

Professional Features & Benefits

  • Door Compatibility: Designed 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 durability for demanding commercial environments.
  • Dual Operation Design: Key outside operates deadbolt while thumb turn inside provides convenient interior access control.
  • Non-Handed Configuration: Universal design eliminates handing requirements for simplified inventory and installation flexibility.
  • UL Listed Certification: UL and ULC Listed for fire safety compliance and code requirements in commercial applications.
  • Complete Strike System: Includes flat strike type with 1" latchbolt throw for secure engagement and reliable operation.
  • Ready-to-Install Package: Comes with 2 keys and all necessary components for immediate installation and operation.
  • Manufacturer Warranty: 1-year limited warranty provides added confidence and protection for commercial installations.

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

  • 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 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 the quality and durability expected from Sargent security hardware. Engineered for demanding commercial applications where dependable performance is 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:
Single Cylinder x Turn Lever
Keyed Function:
Single Cylinder
Lock Type:
Deadbolt
Product Model:
4875
Product Function:
Single Cylinder x Turn Lever
Product Category:
Mechanical Locks
Department:
Door Hardware

Sargent 4875-26D – Frequently Asked Questions

1) Will the Sargent 4875 mortise deadbolt fit a 1-3/4 inch commercial door?
Yes. The 4875 is built for 1-3/4 inch door thickness with a 2-3/4 inch backset, which is the standard commercial door prep. If your doors are thinner interior doors or a non-standard thickness, this is not the lock body to spec.
2) Do I have to order the Sargent 4875 deadbolt left hand or right hand?
No handing to specify. The 4875 is non-handed, so one lock body covers every opening in the building. That is useful if you are stocking spares across a campus, you only carry the one part.
3) How does the Sargent 4875 operate from each side of the door?
Key outside, thumb turn inside. It is a single cylinder x turn lever function, so the deadbolt throws and retracts by key from the exterior and by turn from the interior. There is no latch and no lever, it is a deadbolt only, so you pair it with a separate latch or passage set if the door needs to stay operable when unlocked.
4) Will the Sargent 4875 deadbolt engage my existing frame strike?
The bolt throws 1 inch and ships with a flat strike measuring 3-1/2 by 1-1/8 inches (the 480). If your frame is already cut for a 3-1/2 x 1-1/8 flat strike with a deep enough pocket for a 1 inch bolt, it drops in. Anything prepped for an ANSI T-strike will need the frame reworked or a different strike.
5) Is the Sargent 4875 deadbolt approved for a fire rated opening?
It carries both UL and ULC Listing. That covers the code requirement for fire door assemblies in commercial work, which is why it shows up on school and hospital openings.
6) Is there a keypad or electronic version of a mortise deadbolt instead of the keyed Sargent 4875?
For code-based access on a deadbolt, the Alarm Lock DL4500 Series is a Grade 1 electronic mortise deadbolt with 2,000 user codes and a privacy keypad, listed for doors 1-5/8 inch to 1-7/8 inch thick. The Sargent 4875 is purely mechanical, keyed outside with a thumb turn inside and shipped with two keys, so it needs no power, no batteries and no programming. Choose the DL4500 when you want to issue and revoke codes rather than manage keys, and the 4875 when the opening should stay off any credential system.
7) What is the closest mechanical equivalent to a Sargent 4875 mortise deadbolt from another brand?
The Kaba Ilco 185 Series mortise lock is the nearest straight mechanical counterpart. Both are key-operated mortise deadbolts rather than latching locksets, and both are sold non-handed, so the same body works on a left or right hand door. The Sargent 4875 is configured single cylinder x turn lever, meaning key outside and thumb turn inside, with a 2-3/4 inch backset and a 1 inch bolt throw for 1-3/4 inch doors. Confirm the 185 body's backset against the existing door pocket before swapping, since a mortise pocket cut for a 2-3/4 inch backset will not accept a shallower body without rework.
8) I need keyed entry with a latch, not just a deadbolt. What mortise lock should I use instead of the Sargent 4875?
The 4875 throws a deadbolt only, with a key outside and a thumb turn inside, so it does not hold the door closed on its own. For a keyed entry function that latches, look at the Cal-Royal NM8050, a Grade 1 entrance/office mortise lockset with an auxiliary deadlatch for 1-3/4 inch doors, or the Accentra 8805FL, a Grade 1 storeroom function from the 8800 Series where the outside lever is always locked and the key retracts the latch. Many buyers pair a deadbolt like the 4875 above a latching lockset on the same leaf, so this is often an addition rather than a replacement.
9) My classroom doors need lockdown capability. Is the Sargent 4875 the right choice?
The 4875 is a key-outside, thumb-turn-inside deadbolt, so securing it from inside is a manual turn and there is no lever trim or classroom logic. For classroom security openings, the Corbin Russwin ML2003 is a Grade 1 mortise classroom lockset for 1-3/4 inch doors, the Cal-Royal NM8070 is a Grade 1 classroom mortise lockset with auxiliary deadlatch, and the Marks USA LA318GJ is a Grade 1 classroom security indicator lockset with an ANSI strike and steel escutcheon for 1-3/4 inch doors. If your code official requires single-motion egress, a deadbolt above a latch usually will not satisfy it.
10) What mortise locks look like a substitute for the Sargent 4875 but are not?
Several mortise products share the pocket but not the job. The Schlage PM010 and Falcon MA101 are passage function, non-keyed and not lockable at all. The Hager 3840S and Cal-Royal NM8440 are privacy/bed/bath function, thumb turn only with no outside key. The Emtek 3019 Brisbane and 3106 Manhattan are dummy trim with no working mechanism. The Sargent 4875 is a keyed single cylinder deadbolt with a thumb turn inside and a 1 inch bolt throw, so none of those will give you outside key control.
11) What finishes can I get the Sargent 4875 mortise deadbolt in to match the rest of my doors?
Thirteen finishes: 03 bright brass and 04 satin brass (both clear coated), 09 bright bronze, 10 satin bronze, 10B oil rubbed dark oxidized satin bronze, 10BE, 10BL, 20D dark statuary bronze lacquered, 32 bright stainless, 32D satin stainless, 26D satin chrome over nickel, plus BSP black and WSP white suede powder coat. 32D and 26D are the usual matches for commercial lever hardware already in the building.
12) What is in the box with the Sargent 4875 deadbolt, and what do I still need to buy?
The lock body ships with the 480 flat strike and 2 keys, ready to install. What it does not include is a latching device, so if the door needs to close and stay shut without the bolt thrown, budget for a separate latch or lockset alongside it.
13) Should I use a mortise deadbolt like the Sargent 4875 or a full mortise lockset with a lever?
Use the 4875 when the door already has a latch or a push/pull and you only need to add keyed deadbolt security, or when you want the deadbolt on its own separate keying. If you need latching, lever operation and locking in one body, go to a full mortise lockset instead, for example the Corbin Russwin ML2003 Grade 1 classroom or the Cal-Royal NM8080 Grade 1 storeroom, both cut for 1-3/4 inch doors like the 4875.
14) Is a Sargent 4875 deadbolt heavy duty enough for a school or hospital corridor?
The bolt is laminated stacked steel and the lock is specified as commercial, which is the construction Sargent puts on high traffic institutional openings. Combined with the 1 inch throw, it resists spreading attack on the frame better than a short throw residential bolt.
15) What deadbolt option works on an aluminum storefront door instead of the Sargent 4875?
The Sargent 4875 is built for 1-3/4 inch doors with a 2-3/4 inch backset, which is a wood or hollow metal commercial leaf rather than a narrow aluminum stile. For storefront work, the Alarm Lock DL1300NW Trilogy Networx wireless electronic mortise lock is made for Adams Rite deadlatches in aluminum doors, and the Kaba Ilco BR Series is a bottom rail lock for glass doors. Measure your stile before ordering; a 2-3/4 inch backset body will not fit a narrow stile pocket.
16) Can I use the Sargent 4875 on a door thicker than 1-3/4 inch, or is there a better option?
The Sargent 4875 is specified for 1-3/4 inch door thickness with a 2-3/4 inch backset. If your leaf is thicker, the Hager 3810E and 3810S passage mortise locks cover 1-3/4 inch to 2-1/2 inch doors with a 2-3/4 inch backset, and the Baldwin 6301 entrance/apartment mortise body is listed for 1-3/4 inch and over on a 2-1/2 inch backset. Those are latching functions rather than deadbolts, so match the function to the opening as well as the thickness.
17) For a behavioral health or ligature-resistant opening, what should I specify instead of the Sargent 4875?
A projecting thumb turn is generally not acceptable on anti-ligature openings, and the 4875 uses a turn lever inside. TownSteel offers the MRX-A-01 with satin stainless ligature resistant arch trim and the MRX-L-01 anti-ligature lever, both Grade 1 heavy duty passage mortise locksets for 1-3/4 inch doors, and Marks USA offers the 5PDN Grade 1 hospital passage push/pull paddleset that is ligature resistant and ADA compliant in satin stainless. Those are passage functions, so add separate access control where the room must be secured.
18) I need the mortise lock tied into an access control system. What replaces the Sargent 4875?
The 4875 is a standalone mechanical deadbolt with no electrical provision. For credentialed or monitored openings, the Schlage L9092EU electric lock/unlock mortise lock is keyed outside with request to exit on 12/24VDC for 1-3/4 inch doors, the Command Access ML190 is a heavy-duty motorized mortise lock with field selectable fail safe or fail secure on 24VDC in storeroom function, and the BEST 45HW is a wired electromechanical mortise lock with 12V/24V operation. All three require power to the door, so plan a transfer hinge or electric power transfer.
19) Does the Sargent 4875 use an interchangeable core, or should I look at another mortise lock for keying flexibility?
The Sargent 4875 is a single cylinder deadbolt supplied with two keys. If your facility standardizes on interchangeable cores for rapid rekeying, the Cal-Royal NM8080 is a Grade 1 heavy duty storeroom mortise lockset offered with an interchangeable core option for 1-3/4 inch doors. Confirm the cylinder and keyway your existing masterkey system uses before committing either way, since the cylinder decides whether the new hardware joins your key system or stands apart from it.
20) Is there another non-handed mortise deadbolt besides the Sargent 4875 if I want a second source?
The Kaba Ilco 185 Series is the closest parallel we carry, a deadbolt function mortise lock sold with no handing, single pack. Like the 4875 it means one part number covers every door swing in the building.
21) What is the difference between the Sargent 4875 and a lock body like the BEST 45H that has no trim?
The BEST 45H is a heavy duty mortise lock body in public entrance function with field reversible operation, and the 45HCA intruder function body is likewise a lockbody, so both expect you to supply the lever or knob trim, roses and cylinder separately. The Sargent 4875 is a deadbolt that ships complete with a flat strike, two keys and the components needed to install it, and it carries no lever trim because the outside is key only and the inside is a thumb turn.
How fast can I get the Sargent 4875-26D 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 4875-26D come with a warranty?
Absolutely. The Sargent 4875-26D 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 4875-26D?
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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