Middle Atlantic FLR-FNDLY CBS31in. in. DPMRK - CBS-MRK-31R

Middle Atlantic CBS-MRK-31R Caster Base for MRK Series Racks

Overview

The Middle Atlantic CBS-MRK-31R is a heavy-duty caster base designed specifically for the MRK rack series, adding floor mobility to installations that would otherwise require permanent anchoring or costly manual repositioning. At 700 lbs rated load capacity and a black wrinkle powder coat finish, this base is built for professional AV, security, and IT rack deployments where equipment moves during commissioning, servicing, or facility reconfiguration — not as a workaround, but as a planned part of the infrastructure. The CBS-MRK-31R (often searched as CBS MRK 31R) ships at 25.8 lbs, meaning it adds a manageable 23.8 lbs to your rack's total weight envelope.

If you're deploying Middle Atlantic rack systems in environments like broadcast control rooms, security operations centers, or enterprise server closets where equipment access and repositioning is a recurring need, this base eliminates the manual lift-and-slide problem without compromising structural integrity. For integrators specifying full rack infrastructure accessories, it belongs in the BOM from day one — retrofitting a loaded rack is a two-person job you want to avoid.

Key Features

• 700 lb Weight Capacity: At 317.5 kg rated load, this base handles a fully loaded MRK rack with room to spare. Most commercial 31-inch deep racks topped with NVRs, managed switches, and patch panels will land well under that ceiling — you're not engineering around the caster base, you're counting on it.
• MRK Series Fit: Built specifically for the Base Series MRK, so there's no adapter guesswork. Racks and bases that share an engineered fit transfer load more predictably than universal caster kits, which matters when you're rolling 400+ lbs across a raised floor tile.
• Fine Floor Style: The 'Fine Floor' style designation indicates a caster profile intended for finished or sensitive flooring — relevant in broadcast studios, executive briefing centers, and any facility where a standard industrial wheel would mark or damage the surface.
• Black Wrinkle Powder Coat Finish: Matches the standard Middle Atlantic rack aesthetic. In visible deployments — open-plan NOCs, demo floors, client-facing server rooms — finish consistency matters. Wrinkle powder coat also hides minor surface scuffs better than smooth finishes in high-traffic areas.
• Compact Profile at 4 in Height: The 4-inch (10.2 cm) height addition is low enough that standard rack elevation constraints (raised floors, overhead cable management clearances) are rarely affected. Check your room's ceiling-mounted cable tray height before ordering if you're already near the limit.
• Footprint: 20.88 in × 29.25 in: Width of 20.88 in (53 cm) and depth of 29.25 in (74.3 cm) defines the base's floor contact area. Verify your floor plan accounts for this footprint, particularly in tight telecom rooms where aisle clearances are spec'd to the inch.
• 23.8 lb Base Weight: Adds 23.8 lbs (10.8 kg) to your total rack assembly weight. Factor this into floor load calculations for raised-floor environments — a 700 lb loaded rack plus a 24 lb base is a 724 lb point load on four caster contact patches.

Integration and Compatibility

The CBS-MRK-31R is engineered for the MRK rack series from Middle Atlantic. Before ordering, confirm your specific MRK rack model is listed as compatible — Middle Atlantic offers multiple rack depths and widths within the MRK family, and caster base fitment is dimension-specific. This base measures 29.25 inches deep and 20.88 inches wide, which should align with standard MRK rack footprints, but cross-check against your rack's base mounting pattern.

For complete rack system builds, pair this caster base with appropriate rack stabilizers or leveling feet if the final position requires locking the rack in place after repositioning — casters alone on an unlocked base introduce vibration risk for sensitive storage or recording equipment. Consult Middle Atlantic's rack accessory line for locking caster options if your deployment requires it. If you're also specifying rack power distribution or cable management, those selections are typically independent of the caster base choice.

Frequently Asked Questions

Q: What rack series is the CBS-MRK-31R compatible with?

A: The CBS-MRK-31R is designed for the Middle Atlantic MRK rack series. Always verify your specific MRK model's base mounting dimensions against this unit's 20.88 in width and 29.25 in depth before ordering.

Q: What is the weight capacity of the CBS-MRK-31R?

A: The CBS-MRK-31R is rated for 700 lbs (317.5 kg), which covers a fully loaded professional rack with NVRs, switches, patch panels, and other AV or security equipment in most commercial deployments.

Q: How much height does the CBS-MRK-31R add to my rack?

A: The base adds 4 inches (10.2 cm) to the overall rack height. Verify your room's overhead clearances — ceiling-mounted cable management or HVAC runs — before installing if you're already near height limits.

Q: What finish does the CBS-MRK-31R have?

A: Black wrinkle powder coat, which matches the standard Middle Atlantic rack aesthetic and is durable enough for high-traffic equipment rooms and visible deployments.

Q: Is the CBS-MRK-31R suitable for finished or sensitive flooring?

A: Yes — it uses a Fine Floor style caster profile, which is intended for finished flooring surfaces such as those found in broadcast studios, executive briefing centers, and similar environments.

Q: How much does the CBS-MRK-31R itself weigh?

A: The base weighs 23.8 lbs (10.8 kg). Add this to your rack assembly weight for accurate floor load calculations, particularly in raised-floor environments with specified load ratings.

Marty Allison

The CBS-MRK-31R's 700 lb weight capacity is the number that matters most in a real deployment. I've seen integrators spec a caster base as an afterthought and then discover mid-install that their loaded rack — UPS, NVR stack, patch panels — clears the rated limit by 50 lbs. This unit gives you substantial headroom for a fully populated MRK rack, and the 23.8 lb base weight is low enough that it doesn't eat meaningfully into that budget.

Technical Highlights:

• 700 lb Load Rating: Handles fully populated MRK racks without capacity anxiety — most commercial security or AV rack builds top out well under this ceiling.
• 4 in Height Addition: Low-profile enough to avoid ceiling clearance conflicts in most telecom rooms, but worth measuring if you're near a raised-floor cable tray or overhead obstruction.
• Fine Floor Caster Style: Purpose-built for finished flooring — not a retrofitted industrial wheel. Critical for broadcast studios and executive-visible deployments where floor damage is a real liability.

Deployment Considerations:

• The 20.88 in × 29.25 in footprint defines your floor contact zone — map this against your aisle clearances before the rack arrives on site, especially in tight IDF closets or raised-floor data rooms with defined hot/cold aisle widths.
• Casters without a locking mechanism introduce micro-vibration risk for spinning-disk storage arrays or sensitive recording equipment; verify whether your NVR or server draws specify caster locking requirements before spec'ing this base as the only floor interface.

The CBS-MRK-31R is the right call for security operations centers and broadcast control rooms that reposition racks during routine maintenance cycles — the Fine Floor caster profile and 700 lb capacity make it a fit for finished-floor professional environments where an industrial base would be the wrong tool.