Middle Atlantic Pair 27SP (47.25IN. In. ) Rack Rail - RRF27

Middle Atlantic RRF27 27U Single Rack Rail, 10-32 Threaded, Black E-Coat

Overview

The Middle Atlantic RRF27 is a single 27U rack rail designed for integrators who need to replace, repair, or extend existing rack enclosures without purchasing a full frame. At 47.25 inches tall and threaded to the 10-32 standard, this rail installs directly into compatible rack enclosures and open-frame racks where the original rail has been damaged or where a custom rack build requires individual components. The RRF27 ships as a single piece — plan accordingly if your application requires a matched pair.

Middle Atlantic's rack infrastructure line is a common fixture in AV equipment rooms, security head-end closets, and IT distribution frames. If you're sourcing components for a Middle Atlantic rack system, this rail is the field-replaceable unit that keeps an existing enclosure in service rather than requiring a full cabinet swap.

Key Features

• 27U Height (47.25 in / 120 cm): Spans a full 27 rack units — sized for mid-depth equipment rooms and standard AV/security head-end closets where a 42U full-height frame would waste floor space. Know your existing rail height before ordering; mismatched U counts mean the rail won't align with the mounting frame.
• 10-32 Threaded Rail Type: The 10-32 thread standard is the dominant spec in AV and security racks — compatible with the vast majority of rack-mount screws, cage nut alternatives, and equipment ear hardware in the field. If your existing enclosure uses M6 metric threads, this rail is not the right match; verify your frame's thread standard first.
• Black E-Coat Finish: Electrocoat (e-coat) paint is applied electrostatically and cured, producing a uniform corrosion-resistant surface that holds up to the incidental contact and cable scraping common in active equipment rooms. The flat black finish also reduces light reflection inside dark rack enclosures — a minor but real benefit when technicians work inside lit-up head-end rooms.
• Compact Profile (0.68 in wide × 1.53 in deep): The narrow 0.68-inch width leaves maximum usable interior depth for equipment, and the 1.53-inch depth keeps the rail from eating into side clearance in tight enclosures. Both dimensions are worth confirming against your frame's rail channel specifications before ordering.
• Package Qty: 1 Rail: This listing covers a single rail — not a pair. If you're building or rebuilding a two-post or four-post rack, you'll need two RRF27 units. Order quantity accordingly so you're not waiting on a second shipment when installation starts.

Integration and Compatibility

The RRF27 is designed for use within Middle Atlantic's rack enclosure ecosystem, but the 10-32 thread standard makes it dimensionally compatible with many third-party frames that share the same rail channel geometry. Before ordering for a non-Middle Atlantic enclosure, confirm the mounting hole pattern (EIA-310 standard spacing), the rail channel width, and the thread standard. For integrators building out network or security rack cabinets, pairing this rail with compatible rack screws and a cable management panel keeps the installation clean and serviceable. If you're populating the rack with PoE switches or NVRs, a rack-mount power distribution unit rounds out the infrastructure layer.

Frequently Asked Questions

Q: Does the RRF27 come as a pair or a single rail?

A: The RRF27 ships as a single rail. If your rack build or repair requires both left and right rails, order two units.

Q: What thread standard does the RRF27 use?

A: The RRF27 uses 10-32 threaded holes, which is the standard for most AV and security rack enclosures in North America. If your frame uses M6 metric threads, this rail is not compatible.

Q: What is the exact height of the RRF27?

A: The RRF27 measures 47.25 inches (120 cm) in height, accommodating 27 rack units (27U) of equipment.

Q: What finish does the RRF27 have, and will it hold up in an equipment room environment?

A: The rail features a black e-coat (electrocoat) finish, which provides corrosion resistance and durability suitable for equipment room and head-end closet use.

Q: What are the width and depth dimensions of the RRF27?

A: The rail is 0.68 inches (1.7 cm) wide and 1.53 inches (3.9 cm) deep. Confirm these against your enclosure's rail channel specifications before ordering.

Q: Is the RRF27 compatible with non-Middle Atlantic rack frames?

A: The 10-32 thread standard is widely used across the industry, but physical compatibility with a specific frame depends on the rail channel geometry and hole spacing. Verify your frame's specifications against the RRF27's dimensions (0.68 in W × 1.53 in D) before ordering for a third-party enclosure.

Karl Wilson

The RRF27 is one of those components that gets overlooked until someone strips a thread or an enclosure rail takes a hit during a move — at that point, having a single 27U replacement rail on hand is exactly what keeps a job from going sideways. The 10-32 thread spec here is the right call for the typical security and AV head-end environment; it's what virtually every rack screw kit in the field is threaded for.

Technical Highlights:

• 27U / 47.25 in height: Fills out a mid-size enclosure without the bulk of a full 42U frame — the right rail height for the majority of security head-end closets running NVRs, switches, and power distribution in a compact footprint.
• 10-32 threaded holes: Directly accepts standard rack screws and floating cage nut alternatives without adapters — no re-threading, no conversion hardware, no added labor.
• Black e-coat finish: Electrocoat application means uniform coverage on all rail surfaces, not just exposed faces — the kind of corrosion resistance that matters in telecom rooms with variable humidity or near loading dock environments.

Deployment Considerations:

• This is a single-rail SKU (Package Qty: 1). If you're rebuilding both sides of a two-post or four-post frame, order two — it's an easy oversight when you're pulling a parts list under time pressure on a service call.
• The 0.68 in width and 1.53 in depth are tight tolerances — measure your enclosure's rail channel before assuming this drops in. Middle Atlantic's own frames are the safest match; third-party compatibility depends on whether the frame follows the same channel geometry.

For integrators maintaining a Middle Atlantic-heavy install base across multiple customer sites, keeping one or two RRF27 rails in the service van means a damaged enclosure is a same-day fix rather than a return visit — which is where this component earns its place in the parts inventory.