Sargent MD8643 Classroom Funct...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$3,990.78
$2,680.33
Sargent MD8643 Classroom Function Concealed Vertical Rod Exit Device with Freewheeling Trim

Sargent MD8643 Classroom Function Concealed Vertical Rod Exit Device with Freewheeling Trim

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Model: MD8643E 10BE
From the MD8600 Series Collection
$3,990.78
$2,680.33
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$3,990.78
$2,680.33
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Sargent MD8643 Classroom Function Concealed Vertical Rod Exit Device with Freewheeling Trim

Professional Concealed Vertical Rod Exit Device for Classroom Applications

The Sargent MD8643 is a classroom function concealed vertical rod exit device from the proven 8600 Series, engineered for standard width stile applications on hollow metal doors with 1-3/4" minimum thickness. This device accommodates doors from 1-3/4" to 2-1/4" thick and requires 4-1/2" minimum stile width for proper installation. Available with factory-cut rails in four sizes (E, F, J, G) to accommodate door widths from 24" to 48", with the G Rail specifically designed for 43" to 48" door widths.

Professional Features & Benefits

  • Door Width Compatibility: Available in four rail sizes - E Rail (24" to 32"), F Rail (33" to 36"), J Rail (37" to 42"), and G Rail (43" to 48") with factory cutting to exact door width when specified.
  • Heavy-Duty Construction: Designed for hollow metal doors with 1-3/4" to 2-1/4" thickness and 4-1/2" minimum stile width for robust commercial applications.
  • Classroom Function Design: Freewheeling trim configuration provides appropriate access control for educational facility requirements.
  • Stainless Steel Components: Top bolt constructed from stainless steel for enhanced durability and corrosion resistance.
  • Flexible Installation Height: Standard device centerline at 41" from finished floor, with 38" option for elementary schools and accessibility compliance when used with 100 Series Auxiliary Control.
  • Comprehensive Strike System: Includes 650 Top Strike and 606 Bottom Strike for both panic and fire rated applications.
  • Hex Key Dogging: Standard hex key dogging on non-fire rated devices with optional cylinder dogging (#41 cylinder supplied) available.
  • Extensive Electric Options: Compatible with AL-Alarm, BT-Beacon, PL-SARGuide Photoluminescent, TL-SARGuide Illuminated Touchpad, and monitoring options including LX Latchbolt Monitor, Outside Lever Monitoring, and Request-to-Exit Signal.

Technical Specifications

  • Refer to manufacturer documentation for complete technical specifications.

Installation & Operation

  1. Review manufacturer specifications and verify door preparation requirements including door thickness (1-3/4" to 2-1/4"), stile width (4-1/2" minimum), and door width for proper rail selection.
  2. Use manufacturer-provided templates to mark mounting hole locations accurately on door and frame surfaces, ensuring proper device centerline height (41" standard or 38" for elementary applications).
  3. Prepare door and frame by drilling required holes and routing as specified in manufacturer instructions, accommodating center case dimensions of 8-3/8" x 2-5/8".
  4. Install all mounting hardware including 650 Top Strike and 606 Bottom Strike, securing the device to door and frame per manufacturer torque specifications.
  5. Adjust operational components for proper alignment, latching, and smooth operation with pushbar projection of 3" neutral and 2-1/8" when depressed.
  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
  • Commercial Office Buildings
  • Healthcare Institutions
  • Government and Municipal Buildings
  • Multi-Tenant Residential Properties
  • Industrial and Warehouse Facilities
  • Retail Establishments

Why Choose Sargent Quality?

Sargent 8600 Series exit devices deliver professional-grade reliability with stainless steel top bolt construction and robust hollow metal door compatibility. The series provides simplicity, strength, and durability with comprehensive electric options and flexible installation configurations. Engineered for demanding commercial applications where dependable classroom function performance is essential.

Product Specs

Series:
MD8600 Series
Product Group:
Exit Devices and Trim
Product Subgroup:
Exit Devices - Mortise
Product Type:
Exit Devices - Mortise
Subcategory:
Mortise Exit Devices
Commercial/Residential:
Commercial
Stile Type:
Narrow Stile
Lock Function:
Classroom
Grade:
Grade 1
Model Series:
MD8600 Series
Product Model:
MD8643
Product Function:
Classroom
Product Category:
Exit Devices and Trim
Collection:
MD8600 Series
Department:
Door Hardware

Sargent MD8643E 10BE – Frequently Asked Questions

1) What does classroom function mean on the Sargent MD8643, and how does the freewheeling trim behave?
Classroom function on the MD8643 means the outside lever is locked or unlocked by key, and the push bar always retracts the latches for free egress. The freewheeling ET trim means the outside lever spins freely when locked instead of resisting, so someone yanking on it cannot break the trim or the spindle. That is why it holds up in schools and other high-abuse openings.
2) Do I have to specify handing on the Sargent MD8643?
Handing is required on the MD8643. It is built either RHR (right hand reverse) or LHR (left hand reverse), and there is no field reversing. Stand outside the door on the push side: if the hinges are on your right it is RHR. Order the wrong hand on a concealed rod device and the whole unit goes back.
3) My door only has a 4-inch stile. What mortise exit device can I use instead of the Sargent MD8643?
The MD8643 needs 4-1/2 inches of stile minimum, so a 4 inch stile rules it out. Two narrow stile mortise alternatives: the Adams Rite 8400 Series, a Grade 1 narrow stile life-safety mortise device built for aluminum doors, and the Von Duprin 5575 narrow stile crossbar mortise device, Grade 1 and field reversible for 1-3/4 inch doors. Neither is fire rated per the specs we hold, so on a rated opening neither substitutes.
4) What is the closest narrow stile mortise exit device to the Sargent MD8643 from another brand?
The Sargent MD8643 is a narrow stile Grade 1 mortise exit device. Two narrow stile Grade 1 mortise peers sit closest to it: the Von Duprin 5575-3ft, a narrow stile crossbar mortise lock exit device rated Grade 1 and field reversible for 1-3/4 inch doors, and the Adams Rite 8400 Series narrow stile mortise exit device built for aluminum doors. The MD8643 differs from both in operation - it is a concealed vertical rod device with a pushpad rail and classroom function freewheeling ET lever trim, latching top and bottom rather than into a single mortise strike, and it is handed at order time as RHR or LHR. The Von Duprin 5575 uses a crossbar and is field reversible; the Adams Rite 8400 is specified around aluminum stile doors. Choose the MD8643 where the opening needs two-point concealed rod latching on a hollow metal door.
5) Can a Von Duprin 9875 or 8875 replace a Sargent MD8643 on the same door?
Not directly. The Von Duprin 9875-3FT is a 3 foot smooth case wide stile mortise exit device, Grade 1 and non-handed, and the 8875-3FT is a wide stile crossbar mortise exit device in 36 inch, Grade 1 and non-handed; both are listed for 1-3/4 inch doors and neither is wood door compatible. The Sargent MD8643 is a narrow stile device that works with a 4-1/2 inch minimum stile and 1-3/4 inch to 2-1/4 inch door thickness, and it latches through concealed vertical rods into a 650 top strike and 606 bottom strike. Swapping to either Von Duprin means a single mortise strike in the frame, wide stile door prep, and no rod prep, so the door and frame preparation is not shared. The Von Duprin devices are non-handed, while the MD8643 is ordered RHR or LHR.
6) Which mortise exit devices work on wood doors if the Sargent MD8643 does not?
The Sargent MD8643 is engineered for hollow metal doors 1-3/4 inch to 2-1/4 inch thick. For a wood door opening, the Adams Rite 8300 Series is a Grade 1 wide stile life-safety mortise exit device for wood and hollow metal doors, and the Adams Rite 3300 Series is the fire rated Grade 1 wide stile mortise exit device for wood and hollow metal doors. By contrast the Von Duprin 8875-3FT, the Von Duprin 9875-3FT, and the Detex 30 Series Advantex are each listed as not wood door compatible, so they are not the alternate for that opening.
7) Concealed vertical rod or a rim exit device: which should I use on a pair of classroom doors?
A concealed vertical rod device like the MD8643 latches at the head and the threshold with the rods hidden inside the door, so a pair of doors secures with no center mullion and nothing exposed for students to grab. Rim devices are simpler and cheaper to install but need a mullion between leaves on a pair. Concealed rod requires a door prepped for it from the factory, so it is a specify-at-order decision, not a field retrofit onto a blank hollow metal door.
8) Can I mount the Sargent MD8643 push bar lower than 41 inches for an elementary school?
Yes. Standard device centerline is 41 inches off the finished floor, and a 38 inch centerline is available for elementary schools and accessibility, used with the 100 Series Auxiliary Control. Specify the 38 inch height at order; it is set by how the door is prepped, not adjusted later.
9) Does the Sargent MD8643 come with strikes, or do I order those separately?
Strikes are included. The MD8643 ships with the 650 Top Strike and the 606 Bottom Strike, covering both panic and fire rated applications. What you still choose separately is trim: ET lever trim in A, B, E, F, J, L, P, or W lever styles, or device only with no trim at all.
10) Can I hold the doors unlatched during the school day with a Sargent MD8600 device?
Hex key dogging is standard on non-fire rated MD8600 devices, so you can hold the latches retracted to leave the door push-pull during open hours. Cylinder dogging is available as an option and comes with a #41 cylinder if you want the dogging under key control instead of a hex wrench. Electric dogging (58) and remote dogging / latch retraction (56) are also orderable if you want it on a schedule or a switch.
11) Can I get a Sargent MD8643 with an alarm or a door position signal for access control?
Yes, several ways. Orderable electric options include AL alarmed (needs a 36 inch minimum door width), 53 latchbolt monitor switch, 54 internal micro switch in the ET control for outside lever monitoring, 55 signal switch in the rail for request-to-exit, 56 remote dogging / latch retraction, 58 electric dogging, and 59 Electroguard. Signage options cover BT beacon, PL SARGuide photoluminescent, and TL SARGuide illuminated touchpad. These are factory-built in, so pick them at order time.
12) Is the Sargent MD8643 Grade 1, and what is the mortise lock case doing in a vertical rod device?
Grade 1, the heaviest commercial rating, built for hollow metal doors with a stainless steel top bolt. The device uses a mortise lock case in the door edge rather than a rim latch, which is what lets the classroom key function live in the lock body while the concealed rods handle top and bottom latching. It is a narrow stile device at a 4-1/2 inch minimum stile.
13) If a facility is standardizing on Grade 1 mortise exit devices across mixed openings, which models cover which doors?
All of the following are Grade 1 mortise exit devices, so a facility can standardize at that grade across different door conditions. On narrow stile hollow metal doors needing classroom function with keyed freewheeling lever trim and concealed vertical rod latching, the Sargent MD8643 covers 1-3/4 inch to 2-1/4 inch doors with 4-1/2 inch minimum stile. On narrow stile aluminum, the Adams Rite 8400 Series. On narrow stile with a crossbar and field reversible handing, the Von Duprin 5575-3ft. On wide stile wood or hollow metal, the Adams Rite 8300 Series, or the Adams Rite 3300 Series and Corbin Russwin ED5600AL where the opening is fire rated. On wide stile exit only openings, the Falcon 25-M-EO or the Detex 30 Series Advantex.
14) Is there a simpler mortise exit device than the Sargent MD8643 for an opening that does not need lever trim?
Yes. The MD8643 is ordered with ET lever trim in A, B, E, F, J, L, P or W lever, and classroom function means the outside lever is controlled by key. For an exit only opening with no outside trim at all, the BEST Precision 2301 Series is a mortise exit device supplied exit only with heavy wrought construction, the Falcon 25-M-EO is a Grade 1 exit only mortise device in a 36 inch wide stile 3 foot size, and the Detex 30 Series Advantex is a Grade 1 device only mortise exit device. All three are single point mortise latching without the concealed vertical rods, top and bottom strikes, and lever trim the MD8643 carries, and the Falcon and Detex are wide stile.
15) Which mortise exit device has a recessed push pad instead of a crossbar or standard touchpad?
The Von Duprin 9475/9575 Impact Series is a Grade 1 mortise lock exit device with a recessed push pad for wide stile doors, non fire rated. The Sargent MD8643 uses a pushbar rail with 3 inch neutral projection and 2-1/8 inch when depressed, and it is a narrow stile concealed vertical rod device rather than a single point mortise device. Where a high traffic opening is taking cart and equipment impact on the pad, the 9475/9575 recessed pad addresses that directly; where the requirement is classroom function with keyed lever trim on a narrow stile hollow metal door, the MD8643 is the one built for it.
16) Does the Sargent MD8643 fit doors thicker than 1-3/4 inch when other mortise exit devices do not?
The Sargent MD8643 accommodates doors from 1-3/4 inch to 2-1/4 inch thick. Several mortise peers are listed at 1-3/4 inch door thickness: the Corbin Russwin ED5600AL, the Falcon 25-M-EO, the Von Duprin 5575-3ft, the Von Duprin 8875-3FT, and the Von Duprin 9875-3FT. On a heavier leaf above 1-3/4 inch, the MD8643 is the device in this group whose stated range covers it, and it does so while holding a 4-1/2 inch minimum stile width.
17) How much does a Sargent MD8643 push bar stick out into the opening?
Pushbar projection is 3 inches at neutral and 2-1/8 inches when depressed, so allow roughly 3 inches of clear swing space in front of the door. That matters in tight vestibules and where a door swings toward a wall or another leaf.
18) What finishes does the Sargent MD8643 exit device come in for matching existing school hardware?
Twelve finishes, so matching an existing building is usually possible: 03 bright brass, 04 satin brass, 09 bright bronze, 10 satin bronze, 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, 32D satin stainless, plus BSP black and WSP white suede powder coat. Most school and institutional corridors run 32D satin stainless.
19) Can I standardize a whole building on the Sargent MD8600 Series if the openings are different widths and functions?
Yes, and that is the usual reason facilities pick the 8600 Series. One Grade 1 platform covers 24 to 48 inch door widths through four factory-cut rails, twelve finishes to match existing corridors, and ET lever trim in eight lever styles so the feel matches across the building. Order MD8643 classroom function where key control matters and keep the same rail, finish, and lever elsewhere so maintenance stocks one set of parts.
How fast can I get the Sargent MD8643E 10BE 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 MD8643E 10BE come with a warranty?
Absolutely. The Sargent MD8643E 10BE 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 MD8643E 10BE?
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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