Sargent 4878 Public Toilet Mor...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$732.93
$402.70
Sargent 4878 Public Toilet Mortise Deadbolt with Double Cylinder and Thumbturn

Sargent 4878 Public Toilet Mortise Deadbolt with Double Cylinder and Thumbturn

(No reviews yet) Write a Review

Model: SGT-4878 10B
Selected Finish is

In Stock (leaves warehouse same day if ordered before 3pm ET)

$732.93
$402.70
Adding to cart… The item has been added
Free Shipping on orders over $199
We price match and offer bulk discounts! Click Add to Quote. It's quick and easy.
✨
Earn points with this purchase! You can redeem points for giftcards, iPads, XBox's and more. View Rewards
Free Keying on all locks
You may also like

Sargent 4878 Series Public Toilet Mortise Deadbolt with Double Cylinder and Thumbturn

Professional Mortise Deadbolt for High-Traffic Public Facilities

The Sargent 4878 Series Public Toilet Mortise Deadbolt delivers maximum security and durability for demanding commercial applications. Featuring a laminated stacked steel deadbolt with 2 3/4" backset and 1" latchbolt throw, this UL Listed lock is specifically designed for high-traffic facilities like schools and hospitals. The double cylinder configuration with thumbturn provides key operation from either side while the interior thumbturn retracts but will not project the deadbolt.

Professional Features & Benefits

  • Standard Door Compatibility: Designed for 1 3/4" door thickness with 2 3/4" backset for standard commercial door installations.
  • Heavy-Duty Construction: Laminated stacked steel deadbolt provides maximum security and durability for high-traffic commercial applications.
  • Professional Security Features: 1" latchbolt throw with flat strike type ensures reliable engagement and security performance.
  • UL Listed Compliance: UL and ULC Listed for fire safety and security compliance in commercial building applications.
  • Dual Access Control: Double cylinder design allows key operation from either side with interior thumbturn for convenient retraction without projection capability.
  • Non-Handed Design: Universal installation reduces inventory requirements and simplifies field installation.
  • Complete Installation Package: Includes 2 keys and flat strike for immediate installation readiness.
  • 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

  • Public Restroom Facilities
  • Educational Institution Restrooms
  • Healthcare Facility Restrooms
  • Commercial Office Building Restrooms
  • Retail Establishment Restrooms
  • Multi-Tenant Residential Common Areas
  • Government and Municipal Building Restrooms

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 provides added confidence for high-traffic installations. Engineered specifically for public toilet applications where dependable 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:
Public Toilet
Keyed Function:
Double Cylinder
Lock Type:
Deadbolt
Product Model:
4878
Product Function:
Public Toilet
Product Category:
Mechanical Locks
Department:
Door Hardware

Sargent SGT-4878 10B – Frequently Asked Questions

1) Will the Sargent 4878 public toilet deadbolt fit a standard 1-3/4 inch commercial door?
Yes. The 4878 mortise deadbolt is built for 1-3/4 inch door thickness with a 2-3/4 inch backset, which is the standard commercial mortise prep. If your restroom doors are 1-3/4 inch with a 2-3/4 inch backset mortise pocket, this drops in.
2) How does the 4878 public toilet function actually work from inside the stall or restroom?
Public toilet function means the 4878 takes a key from either side (double cylinder) and has an interior thumbturn that only retracts the deadbolt, it will not throw it. So an occupant cannot lock themselves in with the turn, but staff or a custodian can key it from either face. That is the point of the function in a public restroom: no one gets barricaded inside, and the room can still be secured after hours.
3) Is a public toilet deadbolt the right choice, or should I use a privacy mortise lock on a restroom door?
Two different jobs. The 4878 is a deadbolt only, no latch and no lever, so it secures the opening but does not hold the door closed on its own, and its thumbturn cannot project the bolt. Pick it when you want the room lockable by key from either side and you specifically do not want occupants throwing a bolt. If you want an occupant to lock the door behind them and hold it latched, a privacy lockset is the other route, such as the Cal-Royal NM8440 Grade 1 privacy mortise lockset with deadbolt or the Hager 3840S privacy mortise lock with a 2-3/4 inch backset.
4) Will the 4878 deadbolt engage properly in my existing frame strike?
The bolt throws a full 1 inch and ships with a flat strike, and the strike supplied is a 3-1/2 x 1-1/8 inch (480). A 1 inch throw needs a strike pocket deep enough to take it, so if you are reusing an existing frame prep, check that the pocket depth and the 3-1/2 x 1-1/8 inch strike cutout match before you set the lock. Most commercial hollow metal frames prepped for a mortise deadbolt already take that strike.
5) Is the Sargent 4878 mortise deadbolt approved for a fire rated restroom door?
The 4878 is UL and ULC Listed. For a rated opening, that listing is what your inspector is looking for on the lock itself, alongside the rated door and frame assembly.
6) Can I use the Sargent 4878 as the only lock on a restroom door, or do I need a latch too?
A deadbolt alone does not keep a door closed. The 4878 is a deadbolt with no latchbolt and no lever or knob trim, so pair it with a passage latch or push/pull so the door stays shut in normal use. Falcon MA101 and Schlage PM010 are Grade 1 passage mortise locks that handle that side of the job, and Marks USA MAR5PDN is a Grade 1 hospital passage push/pull paddleset if you want hands-free operation on a restroom.
7) What is a direct alternative to the Sargent 4878 mortise deadbolt if I need a deadbolt-only mortise body with no handing to specify?
The Kaba Ilco 185 Series mortise lock is the closest straight equivalent. It is a deadbolt function mortise lock supplied with no handing, which matches the non-handed, deadbolt-only approach of the Sargent 4878. Both are lock bodies for a deadbolt opening rather than latching locksets with lever or knob trim, so the door mortise pocket and trim scheme stay in the same family. Confirm cylinder and thumbturn arrangement against your opening, since the Sargent 4878 is configured as a double cylinder with an interior thumbturn that retracts the bolt but will not project it.
8) For a restroom door where I want privacy from the inside instead of key operation on both sides, what should I use instead of the Sargent 4878?
Look at the Cal-Royal NM8440, a Grade 1 privacy/bed/bath mortise lockset with a deadbolt for 1-3/4 inch doors, or the Hager 3840S, a Grade 1 privacy/bed/bath mortise lock with a 2-3/4 inch backset. Both are privacy-function locksets, so the occupant secures the door from inside without a key. The Sargent 4878 is a Public Toilet function double cylinder deadbolt, keyed from both sides with an interior thumbturn that retracts the bolt only. The Sargent shares the 2-3/4 inch backset and 1-3/4 inch door thickness with those peers, so the door prep is comparable, but the operation is a different decision: keyed both sides versus a privacy turn.
9) We want keypad access on a restroom or staff door instead of keys. What replaces the Sargent 4878?
The Alarm Lock DL4500 Series is the nearest electronic counterpart: a Grade 1 electronic mortise deadbolt with a privacy keypad and 2,000 user codes, for doors 1-5/8 inch to 1-7/8 inch thick. It keeps the mortise deadbolt format of the Sargent 4878 but replaces both key cylinders with code entry. The Schlage CO-100-MS-40-KP is another route, a standalone electronic mortise lock with privacy function and keypad reader for 1-3/4 inch doors, though it is a lockset rather than a deadbolt body. Note the Sargent 4878 is a purely mechanical double cylinder unit with two keys and a flat strike included, so choosing electronic means adding batteries or power and a programming routine to the facility.
10) Which mortise lock should I use on a behavioral health or hospital restroom instead of the Sargent 4878?
For ligature-resistant openings, the TownSteel MRX-A-01 is a Grade 1 heavy duty passage mortise lockset with satin stainless ligature resistant arch trim for 1-3/4 inch doors, and the MRX-L-01 is the anti-ligature lever version at the same grade and door thickness. The Marks USA 5PDN is a Grade 1 hospital passage mortise push/pull paddleset, ligature resistant and ADA compliant in satin stainless steel. The Sargent 4878 is a conventional double cylinder deadbolt with a projecting thumbturn on the inside, so it suits public restrooms in schools, offices and healthcare corridors rather than patient-side openings where trim profile is governed.
11) Do I need to specify handing when I order a Sargent 4878?
No handing to figure out. The 4878 is non-handed, so one part number covers left and right hand openings. For a property manager stocking restroom hardware across a building, that means a single spare on the shelf covers every door.
12) What comes in the box with the Sargent 4878 mortise deadbolt?
The 4878 ships with two keys and the flat strike, so the lock body, cylinders, thumbturn and strike are there to install. Only one strike is offered, the 3-1/2 x 1-1/8 inch (480), so there is no strike decision to make on the order.
13) What finishes does the Sargent 4878 deadbolt come in, and can I match the other hardware in the building?
Twelve finishes: 03 bright brass clear coated, 04 satin brass clear coated, 09 bright bronze clear coated, 10 satin bronze clear coated, 10B dark oxidized satin bronze oil rubbed, 10BE dark oxidized satin bronze, 10BL dark oxidized satin bronze clear coated, 20D dark statuary bronze lacquered, 32 bright stainless steel, 32D satin stainless steel, BSP black suede powder coat, and WSP white suede powder coat. For institutional restrooms 32D satin stainless is the usual standardization pick; BSP and WSP cover painted or architectural schemes.
14) How durable is the 4878 deadbolt for a high traffic school or hospital restroom?
The bolt is laminated stacked steel, which is the construction Sargent uses for the heavy abuse end of the line, and the 4878 is a commercial lock aimed at schools and hospitals. Combined with the 1 inch throw, it resists the prying and forcing a public restroom door takes.
15) I need a keyless or electronic lock on a restroom instead of a keyed deadbolt. What are my options?
The 4878 is mechanical and key operated on both faces, so if you want code or credential access there are other routes. The Alarm Lock DL4500 is a Grade 1 electronic mortise deadbolt with 2,000 user codes and a privacy keypad, sized for 1-5/8 to 1-7/8 inch doors. The Schlage CO-100 is a Grade 1 standalone electronic mortise lock in privacy function with a keypad reader for 1-3/4 inch doors. Both replace the key with a code; the 4878 keeps it purely mechanical with nothing to power or program.
16) Can the Sargent 4878 be keyed into the master key system already running in my facility?
The 4878 is a double cylinder lock, so it takes a cylinder at each face and both can be keyed into an existing Sargent system the way any other keyed opening in the building is. It arrives with two keys. Specify the keying to match the rest of your restroom and janitorial group when you place the order.
17) For an aluminum storefront or narrow stile restroom door, what do I use instead of the Sargent 4878?
The Alarm Lock DL1300NW Trilogy Networx wireless electronic mortise lock is built with a keypad for Adams Rite deadlatches, which is the narrow stile storefront prep, and the Dormakaba E-Plex 2066 electronic pushbutton keyless mortise lock is specified for wide stile. The Sargent 4878 is a 2-3/4 inch backset mortise deadbolt for 1-3/4 inch commercial doors, which is a hollow metal or wood leaf, not an aluminum stile pocket. Check the stile width and existing prep before deciding between the two families.
18) Is a storeroom mortise lockset like the Accentra 8805FL a substitute for the Sargent 4878?
No. The Accentra 8805FL is a Grade 1 storeroom function mortise lock from the 8800 Series with an Arcadia lever, so it is a latching lockset with an always-locked outside lever released by key. The Sargent 4878 has no lever or latch trim at all; it is a deadbolt-only mortise body with a laminated stacked steel bolt, keyed from both sides, and a 1 inch throw. On a restroom door with a separate push/pull, the 4878 provides the securing bolt, while the 8805FL would replace the entire latching function and require lever trim prep in the door.
19) What is the difference between the Sargent 4878 and a Baldwin 6301 mortise lock body for a double cylinder application?
Backset and function separate them. The Baldwin 6301 is an entrance/apartment function mortise lock body with a 2-1/2 inch backset for doors 1-3/4 inch and over, available knob by knob or lever by lever as the 6301LS. The Sargent 4878 is a Public Toilet function deadbolt with a 2-3/4 inch backset for 1-3/4 inch doors, keyed both sides with an interior thumbturn. The backset difference alone means the two do not drop into the same door prep, and the Baldwin includes a latch and knob or lever trim where the Sargent is bolt only.
20) For a school restroom where we standardize on Grade 1 mortise locksets with levers, what do we pair with or use in place of the Sargent 4878?
If the opening needs a keyed lever lockset rather than a bolt, the Cal-Royal NM8080 is a heavy duty Grade 1 storeroom mortise lockset with an interchangeable core option for 1-3/4 inch doors, and the Corbin Russwin ML2003 is a Grade 1 classroom mortise lockset in the ML2000 Series, also 1-3/4 inch. Both are single-point latching locksets. The Sargent 4878 is used where the door already has push/pull or passage trim and the requirement is a securing bolt: it is a UL and ULC Listed double cylinder deadbolt with a 1 inch throw and 2-3/4 inch backset, non-handed, so one part covers left and right hand openings across a facility.
21) Can I use a Marks USA 21AC or 22AC double cylinder mortise lock in place of the Sargent 4878?
They share the double cylinder idea but not the door. The Marks USA 21AC and 22AC are entrance double cylinder ornamental iron mortise locks with a round knob, specified for 1 inch door thickness, which is narrow-stile ornamental iron work. The Sargent 4878 is built for 1-3/4 inch commercial doors with a 2-3/4 inch backset and a laminated stacked steel deadbolt. If the opening is an iron gate or ornamental door, the Marks units are the fit; for a standard hollow metal or wood commercial restroom door, the Sargent is the one dimensioned for it.
22) Does a passage mortise lock like the Schlage PM010 or Hager 3810S do the same job as the Sargent 4878?
No, they solve opposite halves of the opening. The Schlage PM010 is a Grade 1 non-keyed passage latch mortise lock for 1-3/4 inch doors, and the Hager 3810S is a Grade 1 passage mortise lock with rose and a 2-3/4 inch backset for doors 1-3/4 inch to 2-1/2 inch. Neither secures the door. The Sargent 4878 is the securing element: a double cylinder deadbolt with a 1 inch throw, keyed both sides, with an interior thumbturn that retracts the bolt but will not project it. On many public restroom doors the two are used together, passage trim for operation and the 4878 for lockdown.
23) If I need card or mobile credential access on the same restroom or common area door, what mortise options replace the Sargent 4878?
The Dormakaba E-Plex E5086 is a Grade 1 back to back electronic pushbutton and card entry/egress mortise lock, and the Schlage Electronics LEMD-GRW is a Grade 1 ENGAGE Series wireless mortise lock with a 125kHz proximity reader and mobile enabled deadbolt with LED, carrying a 3 hour fire rating with Greenwich trim, right hand. Both bring credential management the Sargent 4878 does not, since it is mechanical and keyed both sides. Note the LEMD-GRW is specified right hand, where the 4878 is non-handed and covers either swing from one part number.
24) What mortise lock do I order if the restroom door is thinner than 1-3/4 inch or thicker than standard?
For doors above standard thickness, the Baldwin 6310 entrance/storeroom mortise lock body covers 1-3/8 inch and over with a 2-1/2 inch backset, and the Hager 3810E passage mortise lock with escutcheon spans 1-3/4 inch to 2-1/2 inch on a 2-3/4 inch backset. The Alarm Lock DL2700CR classroom mortise lock covers 1-5/8 inch to 1-7/8 inch. The Sargent 4878 is dimensioned for 1-3/4 inch door thickness with a 2-3/4 inch backset, so measure the leaf before ordering it for an older or oversized door.
25) Are Emtek mortise entrance locksets an alternative to the Sargent 4878?
They are not, despite both being called mortise entrance hardware. 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 or latch action. The Sargent 4878 is a working double cylinder deadbolt with a laminated stacked steel bolt, 1 inch throw, and UL and ULC Listing. Emtek dummy units suit an inactive leaf on a decorative pair; they will not secure a restroom door.
How fast can I get the Sargent SGT-4878 10B 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 SGT-4878 10B come with a warranty?
Absolutely. The Sargent SGT-4878 10B 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 SGT-4878 10B?
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
Why buy the Sargent SGT-4878 10B from ZenSupply?
ZenSupply makes it easy to get the commercial door hardware you need—fast shipping, expert support, and rewards on every order. Our team is always ready to help you choose the right product for your project.
!