Middle Atlantic Pair Raised Floor Support Angles For Use w/ RIB-3-MRK-42 Black Powder - ANGLE-3-42

Middle Atlantic ANGLE-3-42 Raised Floor Support Angles for 3-Bay MRK Racks

The Middle Atlantic ANGLE-3-42 is a pair of raised floor support angles engineered specifically for use with the RIB-3-MRK-42 three-bay rack enclosure. At 42 inches deep and spanning 65.81 inches wide, these angles provide the structural foundation needed to deploy a three-bay MRK series rack on a raised access floor — the kind of installation common in data centers, operations centers, and broadcast facilities where cable management runs beneath the floor plane. If you're planning a raised-floor deployment with Middle Atlantic MRK infrastructure, the ANGLE-3-42 (often searched as ANGLE 3 42) is the purpose-built support solution for this configuration.

Overview

Raised floor rack installations introduce a structural challenge that standard rack feet don't solve: the rack must bridge floor tile cutouts while maintaining a rigid, level platform for heavy enclosure loads. The ANGLE-3-42 addresses this by providing dedicated support angles that integrate with the RIB-3-MRK-42 base, distributing rack weight to the raised floor substrate rather than relying on tile edges. The black powder coat finish matches the standard Middle Atlantic rack aesthetic, so the base assembly presents a consistent, professional appearance in customer-facing or mixed-use equipment rooms. These angles are sold as a pair — one left, one right — covering the full 42-inch rack depth on both sides of the enclosure. The 65.81-inch width accommodates the three-bay MRK footprint without modification.

Key Features

• 42-Inch Depth Match: At exactly 42 inches (106.7 cm), the support angles align flush with the full depth of the RIB-3-MRK-42 base — no overhang, no gap. This matters in tight raised floor grid layouts where even a few inches of misalignment can conflict with adjacent tile supports or under-floor cable trays.
• 65.81-Inch Span Width: The 65.81-inch (167.2 cm) width is dimensioned for the three-bay MRK configuration specifically. A three-bay rack footprint is substantially wider than a single enclosure, and these angles provide lateral coverage across the full base width so every mounting point is properly supported — not just the outer edges.
• MRK Series Integration: Designed exclusively for the MRK base series. If you're spec'ing a Middle Atlantic MRK rack with a raised floor base kit, these angles are the correct mating component — substituting generic support hardware risks misaligned bolt patterns and uneven load transfer.
• Non-Gangable Design: These angles are not gangable, which means they are specified per-enclosure rather than daisy-chained across multiple bays as a continuous run. For a three-bay installation this is already accounted for in the width dimension; don't attempt to extend coverage to a fourth bay with additional units.
• Black Powder Coat Finish: The durable powder coat surface resists scratching during installation and matches the standard Middle Atlantic enclosure finish. In a facility where rack aesthetics are part of the design spec, the finish consistency across the full rack systems installation matters.
• 19-lb Shipping Weight: At 19 lbs (8.6 kg) for the pair, these angles are manageable for a two-person installation team without lifting equipment. Raised floor work often requires maneuvering components in confined tile-removal zones — keeping hardware weight reasonable reduces installation complexity.
• Sold as a Pair: One package contains both the left and right support angles for a complete installation. There's no need to order separately or track two line items — a single unit quantity covers the full base support requirement for one three-bay MRK enclosure.

Integration & Compatibility

The ANGLE-3-42 is purpose-designed for the RIB-3-MRK-42 raised floor base, which is part of Middle Atlantic's MRK series rack infrastructure. Before ordering, confirm your rack configuration matches the three-bay, 42-inch-deep MRK specification — the bolt pattern, span, and depth of these angles are dimensioned for that specific base and will not align correctly with other bay counts or depth variants. For broader rack accessories compatibility planning, verify the complete Middle Atlantic MRK base kit includes the RIB-3-MRK-42 base assembly; the ANGLE-3-42 is a supplemental raised floor adaptation component, not a standalone base. Consult the rack mounting guide for raised floor grid spacing requirements before finalizing your tile cutout dimensions.

Frequently Asked Questions

Q: What rack enclosure is the ANGLE-3-42 designed to work with?

A: The ANGLE-3-42 is designed specifically for use with the Middle Atlantic RIB-3-MRK-42 three-bay MRK series raised floor base. It is not a universal support angle and should only be used with the specified base assembly.

Q: Does the ANGLE-3-42 come as a pair or do I need to order two units?

A: The ANGLE-3-42 ships as a pair — both left and right support angles are included in a single package quantity. One unit covers a complete three-bay MRK enclosure installation.

Q: Can the ANGLE-3-42 be used with a two-bay or four-bay MRK configuration?

A: No. The ANGLE-3-42 is dimensioned specifically for a three-bay MRK enclosure — 65.81 inches wide and 42 inches deep. It is not gangable and is not interchangeable with other bay-count variants. Use the corresponding angle part number for your specific bay count.

Q: What is the depth of the ANGLE-3-42?

A: The ANGLE-3-42 is 42 inches (106.7 cm) deep, matching the full depth of the RIB-3-MRK-42 base assembly.

Q: What finish does the ANGLE-3-42 have?

A: The ANGLE-3-42 features a black powder coat finish, consistent with the standard Middle Atlantic MRK rack enclosure aesthetic.

James Everett

The ANGLE-3-42 is one of those components that looks simple on paper but causes real problems when it's missing or substituted. I've seen integrators try to adapt generic angle iron on a three-bay MRK raised floor deployment and spend hours shimming and re-drilling because the bolt pattern doesn't line up — the 65.81-inch width and 42-inch depth on the ANGLE-3-42 are matched to the RIB-3-MRK-42 base geometry, not a general-purpose dimension.

Technical Highlights:

• Depth Precision (42 in / 106.7 cm): Exact depth match to the RIB-3-MRK-42 means the angle terminates flush with the rack's rear rail — no field cutting, no extending past the rear tile edge into under-floor cable pathways.
• Span Width (65.81 in / 167.2 cm): Sized for the three-bay footprint specifically. Every support point on the MRK base has a corresponding angle contact — there are no unsupported spans that could flex under load over time.
• Pair Configuration (19 lbs shipped): Both angles ship together as one SKU, which keeps the bill of materials clean. At 19 lbs for the pair, two installers can position and bolt these down in a standard raised floor tile-removal zone without a lift or staging equipment.

Deployment Considerations:

• Confirm your raised floor grid spacing accommodates the 65.81-inch span before cutting tiles — this width is wider than a standard single-enclosure footprint, and the grid pedestal layout may need adjustment.
• These angles are non-gangable — if the project scope grows to a fourth bay, you'll need the corresponding four-bay angle variant, not an additional ANGLE-3-42. Ordering the wrong part mid-installation is a common delay on rack build-outs.

The ANGLE-3-42 is the right specification for a three-bay MRK raised floor deployment in a data center or operations center where the infrastructure needs to be installed correctly the first time and the base assembly won't be revisited after the enclosure is loaded.