SKU: 20846951720

Middle Atlantic MRK Series Rack, 44 RU, 31"D, Cage Nut

Sale price$916.92 Regular price$1018.80
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Ships within 48 hours · Estimated delivery Aug 31 - Sep 5

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Description

Middle Atlantic MRK Series Rack, 44 RU, 31"D, Cage NutMiddle Atlantic MRK Series Rack, 44 RU, 31"D, Cage Nut Meet the MRK 4431PRO from Middle Atlantics MRK Seriesa rugged, space saving rack designed to perform like a workhorse in demanding IT environments. Built for installers tackling large scale multi bay projects, this enclosure combines durable construction with intelligent design features that streamline deployment, serviceability, and long term reliability. Its seismic certified rating provides

Middle Atlantic MRK Series Rack, 44 RU, 31"D, Cage Nut

Meet the MRK-4431PRO from Middle Atlantic’s MRK Series—a rugged, space-saving rack designed to perform like a workhorse in demanding IT environments. Built for installers tackling large-scale multi-bay projects, this enclosure combines durable construction with intelligent design features that streamline deployment, serviceability, and long-term reliability. Its seismic-certified rating provides peace of mind in challenging locations, while the 44U capacity and generous 31" depth support high-density equipment and complex cabling. The MRK Series is crafted to endure the daily wear, relocation, and heavy loads typical in professional installations, making it a trusted choice for data centers, broadcast suites, and large IT rooms alike. With standard cage nuts and compatible 19" equipment, this rack is ready to integrate into existing footprints, deliver consistent alignment, and help projects stay on schedule from build-out to hand-off. From initial layout to final punch-down, the MRK-4431PRO is designed to simplify installation, maximize usable space, and provide dependable performance over the long term.

  • 44U rack capacity for high-density equipment and future growth
  • 31" (approx. 79 cm) depth to accommodate long-depth servers, power distribution, and cable management
  • Rugged all-steel construction with reinforced joints for reliable, long-term service
  • Seismic-certified to meet broad installation requirements and protect critical IT gear
  • Cage nut kit included for quick mounting of 19" equipment and rapid deployment

Technical Details of Middle Atlantic MRK Series Rack

  • Model: MRK-4431PRO
  • U Height: 44U
  • Depth: 31 inches (79 cm)
  • Construction: Heavy-gauge steel with reinforced frame for durability
  • Mounting: Standard 19" equipment mounting rails compatible with most IT gear
  • Hardware: Cage nuts included to simplify rack mounting and alignment
  • Seismic Certification: Designed to meet applicable seismic performance requirements for reliable operation

how to install Middle Atlantic MRK Series Rack

Prepare the installation site by confirming floor levelness, load capacity, and adequate space for 44U of gear plus accessibility for maintenance. Begin by inspecting the MRK-4431PRO for any transit damage and ensuring you have all required mounting rails, cage nuts, screws, and accessories. Position the rack in your designated footprint, ensuring there is clearance for front and rear door access and for cable management paths. Install the vertical mounting rails if they are not already attached, align them to the frame, and secure them according to the manufacturer’s guidelines. Use the included cage nuts to secure your 19" equipment, starting with the heaviest components at the bottom to lower center of gravity and optimize airflow. Route power, data, and auxiliary cables through the rack’s designated channels or accessory cable management features to minimize turbulence and airflow impedance. Finally, verify door security, ensure proper grounding, and confirm seismic-rated fasteners are fully engaged if required by your installation standards. Regularly inspect mounting hardware and cable ties as part of routine maintenance to preserve performance and safety over time.

Frequently asked questions

Q: What is the MRK-4431PRO?

A: The MRK-4431PRO is a 44U, 31" deep server/rack enclosure from Middle Atlantic’s MRK Series, built for heavy-duty, multi-bay installations with seismic-certified performance.

Q: Does it include cage nuts?

A: Yes. The MRK-4431PRO ships with a cage nut kit to simplify mounting of standard 19" equipment.

Q: Is the MRK Series seismic-certified?

A: Yes. The MRK Series is designed with seismic considerations in mind to support reliability in a variety of installation environments.

Q: What equipment is compatible with this rack?

A: It is designed for standard 19" rack-mounted equipment. Ensure your devices' mounting depth and weight are within the rack’s specifications and that you follow proper mounting and grounding guidelines.

Q: How do I plan for airflow and cable management?

A: Plan a layout that prioritizes front-to-back airflow, use vented doors if available, and route cables through dedicated channels or accessories to minimize obstruction to cooling pathways. Regularly review cable management strategies during expansion to maintain optimal performance.

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
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Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
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SKU: 20846951720

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BWW
Natrona Heights, US
★★★★★ 5
Easy to install
Size: 23.6 Inch, Color: White
Super easy to install. I use different wall anchors. The anchors like all anchors that come with shelves are not great. The shelves look very clean on the wall.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 31, 2026
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Verified Purchase
Vinnae
Houston, US
★★★★★ 5
Easy to install
Size: 23.6 Inch, Color: White, Size: 23.6 Inch, Color: White
This product exceeded my expectations. The installation process was incredibly straightforward—even for someone with little to no experience—and the instructions were clear and easy to follow. Once installed, it feels very sturdy and secure, with no wobbling or shifting at all. You can tell it’s well-designed and made with quality materials. I also appreciated how quickly I was able to set everything up without needing any extra tools or help. Overall, it’s a reliable, user-friendly product that I would absolutely recommend to anyone looking for something dependable and easy to install. Drill is required though.
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Reviewed in the United States on March 30, 2026
M
Verified Purchase
Mac
Lowell, US
★★★★★ 5
It holds up weight
Size: 23.6 Inch, Color: White
Nice boards. I will order again
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Reviewed in the United States on April 4, 2026
D
Verified Purchase
Dania La Rosa
Cuba, US
★★★★★ 1
Don't buy
Size: 23.6 Inch, Color: White
The shelf is very flimsy and not sturdy at all. It feels unstable and poorly made. Definitely not worth the money, I wouldn’t recommend wasting your time or money on this product.
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Reviewed in the United States on February 22, 2026
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Chris
Lexington, US
★★★★★ 5
Looks Great with a Couple of Modifications
Turned out nice. I would say for the price, it's great quality and took about 45 mins to assemble, but I was also taking my time and using a screw gun. I wouldn't assemble everything by hand. Maybe to get the machined screws started by hand but everything else use a screw gun or drill. 1 thing to look out for: The light strip has a piece of it's stickers that is longer on the one end. I think that's so you can move the light strip over and then the end with the cord on it can be routed threw the top of the wooden side panel, then down on the outside of the shelf. As you can see in my video, I had to route it down on the inside of the shelf because the part that connects the power cord to the led strip landed right where 2 wood panels need to be screwed together. This might seem confusing in this review, but lay down the light strip 1st and then you might understand what I mean. The way mine turned out is still OK, but as you can see the power button control has to be mounted on the inside and you'll see it. Not a big deal for me, but that's not the way I wanted it to begin with. Also, I hated that the cord was white. I just put a couple coats of black spray paint and it looks a lot better.
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Reviewed in the United States on September 24, 2025

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