Sargent 78-2875 Outside Knob O...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$207.79
$177.55
Sargent 78-2875 Outside Knob Only with B Design

Sargent 78-2875 Outside Knob Only with B Design

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Model: 78-2875-26D
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$207.79
$177.55
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Sargent 7800 Series Outside Knob with B Design Commercial Door Hardware

Professional Door Hardware Component

The Sargent 7800 Series Outside Knob with B Design provides a professional replacement or upgrade component for commercial door applications. This outside knob features the distinctive B design styling and is engineered to integrate seamlessly with existing 7800 Series hardware systems. Built to Sargent’s commercial-grade standards with precision-engineered construction, this component delivers reliable operation for high-traffic commercial environments where dependable performance is essential.

Professional Features & Benefits

  • 7800 Series Compatibility: Designed specifically for integration with Sargent 7800 Series locksets for consistent performance and appearance across your hardware system.
  • B Design Styling: Features the classic B design profile that complements traditional commercial door hardware aesthetics with professional appearance.
  • Outside Knob Configuration: Provides secure exterior access control while maintaining interior egress functionality of the complete lockset system.
  • Commercial-Grade Construction: Built with durable materials and precision manufacturing to withstand the demands of high-traffic commercial applications.
  • Professional Installation: Engineered for straightforward integration with existing 7800 Series hardware using standard installation procedures and manufacturer templates.
  • Replacement Component: Ideal for upgrading or replacing worn exterior knobs while maintaining system integrity and security performance.

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 7800 Series components deliver professional-grade reliability with precision-engineered construction designed for demanding commercial applications. This outside knob maintains the series’ reputation for consistent performance and durability in high-traffic environments. Engineered for demanding commercial applications where dependable performance is essential.

Product Specs

Series:
7800 Series
Keyed Function:
Non-Keyed
Subcategory:
Parts and Accessories
Commercial/Residential:
Commercial
Handle Type:
Knob
Product Group:
Mechanical Locks
Product Subgroup:
Parts and Accessories
Product Type:
Knobsets
Door Hand Direction:
Non-Handed
Product Category:
Mechanical Locks
Department:
Door Hardware

Sargent 78-2875-26D – Frequently Asked Questions

1) Is the Sargent 78-2875 a complete lockset or just the knob?
It is the outside knob only, a replacement trim component for Sargent 7800 Series mortise locksets. There is no lock body, latch, cylinder or inside knob with it. If you need a full working lock, order a complete 7800 Series mortise lockset instead and use the 78-2875 only when the existing lock body is sound and the exterior knob is worn or damaged.
2) Do I need to order a left-hand or right-hand version of the Sargent 78-2875 knob?
No handing to specify. The 78-2875 outside knob is non-handed, so the same part works on a left- or right-hand door. Handing is set by the 7800 mortise lock body it mounts to, not by the knob.
3) Does the Sargent 78-2875 knob take a key cylinder?
Non-keyed. The B design outside knob has no cylinder hole, so it suits 7800 functions where the outside knob is not the keyed element. On a keyed 7800 function the cylinder sits in the lock case or a keyed knob/escutcheon trim, so this knob is not the right trim for that opening.
4) Will the Sargent 78-2875 knob fit a cylindrical lock like a Schlage D Series?
No. It is trim for Sargent 7800 Series mortise locks and mounts to that lock body's spindle and rose prep. For a cylindrical knob opening you would use a cylindrical product such as the Schlage D10S Grade 1 passage knob lock or the Corbin Russwin CK4310 Grade 1 passage cylindrical lock, which fits doors 1-3/8 to 2 inches thick.
5) The opening needs a keyed outside knob, not a non-keyed one. What should I look at?
The Sargent 78-2875 outside knob with B design is non-keyed, so it does not accept a cylinder on its own. If the outside must be keyed, keyed cylindrical options include the Corbin Russwin CK4851 entrance/office lock with the Global knob and conventional cylinder for 1-3/8 inch to 2 inch doors, the BEST 8K Series entrance function single cylinder knob lock, and the Dexter C2000 Series entry/office Grade 2 ball knob lock for 1-3/8 inch to 1-3/4 inch doors. For a keyed classroom opening, the Dexter C2000 classroom function is the ball knob equivalent.
6) What finish does the Sargent 7800 B design outside knob come in?
Satin stainless steel, finish code 32D. That is the common commercial finish on schools, healthcare and office openings, so it will match 32D levers, push plates and closers already on the building. If your other 7800 openings are brass or bronze, the 32D knob will not match them.
7) I manage a building with mixed knob hardware. Can I use this Sargent knob to standardize the look?
Only on openings that already carry Sargent 7800 Series mortise locks, since that is what the B design knob mounts to. For openings running cylindrical hardware you would standardize with a cylindrical family instead, for example BEST 8K Series heavy duty Grade 1 knob locks or the Dexter C2000 Series Grade 2 knob locks that cover 1-3/8 to 1-3/4 inch doors.
8) What do I need to check before swapping in a replacement Sargent 7800 outside knob?
Confirm the lock in the door is actually a Sargent 7800 Series mortise lock and that the existing outside trim is a knob rather than a lever or escutcheon, since the 78-2875 is knob trim. Also confirm the function does not require a keyed outside knob, because this one is non-keyed. Sargent's 7800/8200 mortise catalog and the 7800 install instructions cover the trim and spindle details for the swap.
9) Is a dummy knob like the Schlage A170 the same thing as an outside knob only?
They are not the same. The Schlage A170 is a single dummy trim in the A Series, a Grade 2 heavy duty non-keyed knob that mounts to the door face and does not turn or retract a latch. The Sargent 78-2875 is an operating outside knob with the B design that engages the 7800 Series mortise lock spindle, so it turns and works the lock. Other dummy options include the BEST 6K Series single dummy trim, Grade 2 medium duty, and the Cal-Royal BA40 dummy knob for 1-3/8 inch to 1-3/4 inch doors. Choose a dummy only where you want a fixed pull on an inactive leaf.
10) What is a lighter-duty knob option for interior doors where a 7800 Series component is more than the door needs?
The Sargent 78-2875 is a commercial outside knob built for the 7800 Series mortise platform. For interior doors in lighter traffic, Grade 2 cylindrical passage knobsets include the Arrow MK01 and Arrow RK01 ball knob, the Corbin Russwin CK4410 with the Global knob, the Falcon W101 with 2-3/4 inch backset and a fire rating, and the Dexter C2000 passage ball knob, all listed for 1-3/8 inch to 1-3/4 inch doors except the CK4410, which carries the same range. Grade 3 choices such as the Pamex FTF Baron passage knob cover the same thickness range for light residential-style interior openings.
11) Is a fire-rated knob lock available if the opening is a rated door?
The Sargent 78-2875 is an outside knob component with the B design for the 7800 Series and is supplied as trim rather than a complete rated assembly. Among complete cylindrical knob locks, the Falcon W101 Grade 2 medium duty passage lock with 2-3/4 inch backset and the Falcon X101 Grade 1 heavy duty passage knobset both carry a fire rating, with the X101 covering doors 1-3/8 inch to 2-1/4 inch thick. Confirm the rated assembly listing for the specific door before ordering.
12) Does the 78-2875 need handing like the residential knobsets do?
The Sargent 78-2875 outside knob with B design is non-handed, so one part covers left and right hand openings on the 7800 Series. That differs from choosing a complete lockset, where you also have to settle backset and door thickness: the Kwikset 400P-CP keyed entry knob is listed for 1-3/8 to 1-3/4 inch doors at Grade 3, the Baldwin Estate 5000 Baltimore passage knob comes preconfigured with a 2-3/8 inch backset and full lip strike, and the Schlage Residential F500 Plymouth with Georgian knob ships with adjustable backsets and dual strikes.
13) We need privacy function on restroom doors instead of this knob. What are the options?
The Sargent 78-2875 is a non-keyed outside knob for the 7800 Series and is not a privacy set. Complete privacy knob locks include the Dexter C2000 Series Grade 2 privacy ball knob for 1-3/8 inch to 1-3/4 inch doors, the Cal-Royal BER20 Grade 3 privacy knob with brass trim for the same thickness range, the Pamex FTF Baron Grade 3 privacy lockset, and the Deltana 6112 St. Thomas privacy knob for 1-3/8 inch to 2 inch doors.
14) Will a knob trim from an exit device work in place of the Sargent 78-2875?
No. The Imperial USA ED-BKL580 is knob trim in the ED-500 Series with a storeroom function, intended to mount to an exit device chassis. The Sargent 78-2875 outside knob with B design is engineered to integrate with Sargent 7800 Series mortise lockset hardware. The two mount to different lock platforms and are not interchangeable, so match the trim to the lock body already in the door.
15) Is the Sargent 78-2875 B knob suitable for high traffic commercial doors?
It is a commercial-rated component, not residential trim, and is intended for high-traffic openings like schools, hospitals, offices and government buildings where it replaces a worn exterior knob on an existing 7800 mortise lock.
How fast can I get the Sargent 78-2875-26D 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 78-2875-26D come with a warranty?
Absolutely. The Sargent 78-2875-26D 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 78-2875-26D?
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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