Sargent 4879 Exit Function Mor...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$446.57
$240.00
Sargent 4879 Exit Function Mortise Deadbolt with Inside Turn Only

Sargent 4879 Exit Function Mortise Deadbolt with Inside Turn Only

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Model: SGT-4879 10B
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$446.57
$240.00
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Sargent 4879 Series Exit Function Mortise Deadbolt with Inside Turn Only - 1 3/4" Door Thickness

Professional Exit Function Mortise Lock Solution

The Sargent 4879 Series Exit Function Mortise Deadbolt delivers maximum security and durability for high-traffic commercial applications. Featuring a laminated stacked steel deadbolt with 2 3/4" backset depth and 1" latchbolt throw, this non-handed mortise lock is designed for 1 3/4" door thickness applications. UL and ULC listed for code compliance, this lock is ideally suited for demanding facilities like schools and hospitals where reliable performance is essential.

Professional Features & Benefits

  • Door Compatibility: Designed for standard 1 3/4" door thickness with 2 3/4" backset depth for versatile installation options.
  • Heavy-Duty Construction: Laminated stacked steel deadbolt provides exceptional security and durability for commercial applications.
  • Exit Function Design: Inside turn only operation allows for secure exit without compromising building security protocols.
  • Non-Handed Configuration: Universal design eliminates handing requirements for simplified inventory and installation.
  • UL/ULC Listed: Meets rigorous safety and performance standards for code compliance in commercial applications.
  • Complete Lock Set: Includes 2 keys and flat strike for complete installation package.
  • Manufacturer Warranty: 1-year limited warranty for added confidence and protection.

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/ULC listing for demanding commercial applications. Backed by a 1-year limited warranty, this exit function lock is engineered for high-traffic facilities where dependable security 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:
Exit Only
Keyed Function:
Non-Cylinder
Lock Type:
Deadbolt
Product Model:
4879
Product Function:
Exit
Product Category:
Mechanical Locks
Department:
Door Hardware

Sargent SGT-4879 10B – Frequently Asked Questions

1) Will the Sargent 4879 mortise deadbolt work on a 1-3/4 inch commercial door?
Yes, 1-3/4 inches is exactly what the 4879 is built for. It's a single-thickness deadbolt body, so if your door is thicker or thinner than 1-3/4 inches you need a different lock. Backset is 2-3/4 inches, which is the standard commercial mortise backset, so an existing 2-3/4 inch mortise pocket will take it.
2) Does the Sargent 4879 deadbolt take a key cylinder, or is it turn only?
Turn only, from the inside. The 4879 is a non-cylinder exit function deadbolt: there's no keyway and no outside operation at all. Someone inside throws or retracts the bolt with the thumbturn, and there is no way to unlock it from the corridor side. If you need key access from outside, this is the wrong body, order a keyed mortise deadbolt instead.
3) Will the Sargent 4879 deadbolt latch into the strike prep I already have in the frame?
The 4879 ships with a flat strike measuring 3-1/2 x 1-1/8 inches, and that is the only strike option on the lock. The bolt throws a full 1 inch, so it will reach through a normal frame gap into a mortise pocket. If your frame is cut for a full ANSI strike (the taller 4-7/8 inch face), the 480 flat strike will not fill that cutout and you'll want a filler or a frame-matching strike.
4) Should I use a mortise deadbolt like the Sargent 4879 or a full mortise lockset with a deadbolt built in?
It depends on whether the door needs a latch. The 4879 is a deadbolt body alone, one bolt, inside turn, no lever and no latchbolt. If the door also has to latch shut and be operated by a lever, you want a combined lockset instead: the Cal-Royal NM8440 is a Grade 1 privacy mortise lockset with a deadbolt for 1-3/4 inch doors, and the Corbin Russwin ML2003 is a Grade 1 classroom mortise lockset at the same thickness. Use the 4879 where you're adding secondary bolt security to an opening that already latches, or on a door that's held by other means.
5) What is the closest equivalent to the Sargent 4879 mortise deadbolt from another brand?
The Kaba Ilco 185 Series mortise lock is the nearest peer in function: it is a deadbolt-function mortise lock supplied with no handing, matching the Sargent 4879's non-handed deadbolt configuration. The Sargent 4879 is a non-cylinder exit function deadbolt operated by an inside turn only, so if the opening needs key control from the outside, the 185 Series deadbolt function should be specified with the cylinder arrangement the door requires.
6) Does a storeroom mortise lock do the same job as an exit function mortise deadbolt?
No. The Accentra 8805FL is a Grade 1 storeroom function mortise lock in the 8800 Series with an Arcadia lever, and the Cal-Royal NM8080 is a Grade 1 storeroom mortise lockset for 1-3/4 inch doors with an interchangeable core option. Both are latching locksets with a lever and outside key control. The Sargent 4879 is a deadbolt with an exit only function and an inside turn, so it secures the opening but does not latch the door or carry trim. On a door that needs both, the storeroom lockset and the deadbolt are specified together, not one instead of the other.
7) My door is thicker than 1-3/4 inches. What mortise lock covers that range?
The Sargent 4879 is built for 1-3/4 inch door thickness. Where the door is thicker, the Hager 3810E and 3810S 3800 Series Grade 1 passage mortise locks cover 1-3/4 inch to 2-1/2 inch with a 2-3/4 inch backset, matching the 4879's 2-3/4 inch backset, and the Baldwin 6301 mortise lock body is listed for 1-3/4 inch and over on a 2-1/2 inch backset. Note the Hager and Baldwin bodies are latching functions, not deadbolts.
8) Do I have to specify handing when ordering a Sargent 4879 mortise deadbolt?
No handing to specify. The 4879 body is non-handed, so one part number covers left and right hand openings, in-swing and out-swing. That's useful if you're stocking spares across a building, one shelf item covers every door.
9) Is the Sargent 4879 deadbolt fire door listed?
The 4879 is UL and ULC listed. That covers you for code compliance on commercial openings in the US and Canada. Note this is a deadbolt body with an inside turn only, so on a required egress door it has to be part of an approved arrangement, a deadbolt with no outside release is used where the opening isn't a required exit or where the turn satisfies single-motion egress from the secure side.
10) What's in the box with a Sargent 4879 deadbolt, and what else do I need to order?
The 4879 comes with the mortise deadbolt body, two keys, and the flat strike. What it does not include is any outside trim, since there isn't any, the outside face is blank. You provide the door prep. If the opening also needs a latch for normal passage, you're ordering a second lock, the 4879 is a deadbolt only and does nothing to hold the door closed when the bolt is retracted.
11) I need a deadbolt on a classroom or dorm door that staff can also control electronically. Is the Sargent 4879 the right choice?
No. The 4879 is purely mechanical with an inside thumbturn, there is no keypad, no credential reader and no wiring provision. For electronic control on a mortise deadbolt, look at the Alarm Lock DL4500 Series, a Grade 1 electronic mortise deadbolt with 2,000 user codes and a privacy keypad for 1-5/8 to 1-7/8 inch doors. If the door is 1-3/4 inches, it falls inside that range. For classroom function specifically, the Alarm Lock DL3500CR is Grade 1 with 300 user codes over the same thickness range.
12) Can I use the Sargent 4879 to secure a pair of doors or a storefront glass door?
Not a glass storefront door. The 4879 needs a standard 1-3/4 inch door with a mortise pocket at a 2-3/4 inch backset, which an aluminum or glass door stile will not give you. For a glass door bottom rail application, the Kaba Ilco BR Series is the lock built for that. On a pair of wood or hollow metal doors, the 4879 can bolt the inactive leaf into the frame head or threshold prep, but it does nothing on its own for the active leaf.
13) What mortise lock should I use on a classroom door instead of an exit deadbolt?
Classroom openings are usually specified with a classroom function lockset rather than a deadbolt. The Corbin Russwin ML2003 is a Grade 1 classroom mortise lockset in the ML2000 Series for 1-3/4 inch doors, and the Cal-Royal NM8070 is a Grade 1 classroom mortise lockset with auxiliary deadlatch, also for 1-3/4 inch doors. Both latch the door and are keyed from the corridor side. The Sargent 4879 is an exit function deadbolt with inside turn only and no outside operation.
14) The door needs privacy, not exit security. What takes the place of an exit mortise deadbolt?
For bed, bath, or single-occupancy rooms, the Cal-Royal NM8440 is a Grade 1 privacy mortise lockset with deadbolt for 1-3/4 inch doors, and the Hager 3840S 3800 Series is a Grade 1 privacy mortise lock with a 2-3/4 inch backset covering 1-3/4 inch to 2 inch doors. Both combine privacy trim with a bolt in one lock body. The Sargent 4879 is a deadbolt alone with an inside turn and no lever or knob trim.
15) Is a passage mortise lock a cheaper alternative to an exit function deadbolt?
They do different jobs. The Schlage PM010 is a Grade 1 non-keyed passage latch mortise lock for 1-3/4 inch doors and the Falcon MA101 is a Grade 1 heavy duty mortise passage lock with field reversible operation and a fire rating. Passage locks latch the door but provide no locking at all. The Sargent 4879 is a deadbolt that secures the opening from the inside turn, so a passage lock is not a substitute where the door has to be secured.
16) Which mortise lock gives me credentialed access on a door where a mechanical deadbolt turn is not enough?
For managed credentials, 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 a mobile enabled deadbolt with LED and Greenwich trim, rated 3 hours fire. Both allow credentials to be issued and revoked. The Sargent 4879 is a non-cylinder deadbolt with an inside turn only, so access is controlled mechanically at the door.
17) What is the difference between an exit function mortise deadbolt and an intruder function mortise lock body?
The BEST 45HCA Series intruder function lock body is a heavy duty mortise lockbody built to be locked down from inside the room while the opening still operates as a lockset. The Sargent 4879 is a deadbolt only, non-handed, with an inside turn and no outside operation, so it locks the opening but leaves latching and trim to a separate lockset. On a lockdown-driven specification the intruder body is the direct answer; on a door that needs a secondary bolt, the 4879 is.
18) Can I use a ligature resistant mortise lockset on a behavioral health door instead of a deadbolt with a turn?
For behavioral health openings, the TownSteel MRX-L-01 is a Grade 1 heavy duty stainless steel anti-ligature lever mortise lockset in passage function for 1-3/4 inch doors, and the MRX-A-01 is the same passage function with satin stainless ligature resistant arch trim. The Marks USA 5PDN is a Grade 1 hospital passage mortise push/pull paddleset, ligature resistant and ADA compliant in satin stainless. The Sargent 4879 uses an inside turn to throw the bolt, which is a projecting operator those specifications are usually written to avoid.
19) What finishes does the Sargent 4879 mortise deadbolt come in?
Twelve finishes, and they cover both the traditional brass and bronze range and the modern painted ones: 03 bright brass, 04 satin brass, 09 bright bronze, 10 satin bronze, 10B oil rubbed dark oxidized satin bronze, 10BE dark oxidized satin bronze, 10BL clear coated dark oxidized satin bronze, 20D dark statuary bronze lacquered, 32 bright stainless, 32D satin stainless, plus BSP black suede and WSP white suede powder coat. 32D satin stainless is the usual pick for schools and hospitals where the rest of the hardware is 630.
20) How durable is the Sargent 4879 deadbolt for a high traffic building like a school or hospital?
The bolt is laminated stacked steel, which is the construction Sargent uses where the bolt has to take abuse and prying rather than just hold a door shut. It's specified as a commercial product and the description names schools and hospitals as the intended application. For a property manager standardizing across a building, the non-handed body means one spare part covers every door regardless of swing.
21) Will a dummy mortise lockset work where I only need the inside to operate?
No. Dummy trim such as the Schlage L0170 Grade 1 mortise non-keyed half dummy lever for 1-3/4 inch doors, or the Emtek 3102 Memphis mortise dummy, is fixed trim with no bolt or latch of any kind. The Sargent 4879 is an exit function deadbolt with a laminated stacked steel bolt and a 1 inch throw operated by the inside turn, so it actually secures the door.
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Can I return it if it doesn’t work for me?
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Does the Sargent SGT-4879 10B come with a warranty?
Absolutely. The Sargent SGT-4879 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-4879 10B?
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