Middle Atlantic SB3 Contractor Pack Flanged Blank Panels in Plain Poly Bags 6 Pieces - SB3-CP6

Middle Atlantic SB3-CP6 3U Flanged Blank Rack Panels — 6-Pack

Overview

The Middle Atlantic SB3-CP6 is a contractor-pack of six 3U flanged blank panels built for integrators who need to close out rack space cleanly and consistently across commercial installations. At 19 inches wide and 5.25 inches tall, each panel fills exactly three rack units — the standard gap left by unoccupied equipment bays in AV racks, security head-end enclosures, and network infrastructure cabinets. If you're commissioning multiple racks on the same job, the SB3-CP6 ships in a plain poly bag rather than retail packaging, keeping unit cost low without sacrificing the finish quality you need on client-facing installs. For the full Middle Atlantic rack accessories catalog, including shelves, rails, and cable management, browse the brand page.

Key Features

• 3U Coverage per Panel (5.25 in / 13.3 cm tall): Each of the six panels spans exactly three rack units. That's useful because most leftover rack space in a finished head end comes in multi-U gaps — one SB3-CP6 pack covers six such gaps, enough to close out a 42U rack with room to spare on a typical multi-device install.
• 19-Inch Standard Width (48.3 cm): Fits any EIA-standard 19-inch rack rail — the same form factor used across rack-mount accessories, patch panels, NVRs, and AV gear. No fitment guesswork on commercial enclosures.
• Flanged Style (2 Mounting Points): The flanged design uses two mounting points — one at each ear — so the panel seats flush and stays flat even in racks that see vibration or repeated equipment swaps. Non-flanged blanks tend to bow over time; the flange prevents that.
• Textured Black Powder Coat Finish: The textured finish matches Middle Atlantic's rack enclosure line visually, so the installed result looks intentional rather than patched. Powder coat is also more durable than paint for rack environments where panels occasionally get pulled, stacked, or slid across metal surfaces during reconfigurations.
• Steel Construction: Steel blanks matter in installations where airflow management is part of the design. A steel filler panel supports consistent front-to-back airflow paths in enclosed racks — foam or cardboard alternatives don't hold their shape under heat cycling. For PoE switch or NVR rack builds where thermal management is a real concern, that distinction is worth noting.
• Minimal Depth (0.52 in / 1.3 cm): The 0.52-inch depth means SB3-CP6 panels don't intrude into usable rack depth. That's relevant in shallow-depth enclosures (12–15 inches) where every inch behind the panel matters for cable routing.
• Contractor Pack of 6 in Plain Poly Bags: The SB3-CP6 (often searched as SB3 CP6) ships as a six-piece contractor pack in plain poly bags rather than retail boxes — a practical choice when you're ordering for multiple jobs or stocking a van. Lower packaging overhead, same panel quality.

Integration & Compatibility

The SB3-CP6 is designed for any EIA-standard 19-inch rack system. It integrates directly with Middle Atlantic's rack enclosure line, but the 19-inch flanged format is universal — it will seat in third-party open-frame racks, enclosed wall-mount cabinets, and two-post relay racks equally well. For rack enclosure builds in security operations centers, server rooms, or AV head ends, these panels serve as standard gap fillers between active equipment bays. No tools beyond a standard screwdriver are required for installation; the two-point flange mount accepts standard rack screws (M5 or 10-32 depending on your rail type — verify your enclosure's thread spec before ordering rack hardware).

What's in the Box

• 6x Middle Atlantic SB3-CP6 3U flanged blank panels (textured black powder coat steel)
• Packaged in plain poly bags (contractor pack format)

Frequently Asked Questions

Q: How many rack units does each SB3-CP6 panel cover?

A: Each panel covers 3 rack units (3U), measuring 5.25 inches (13.3 cm) in height. The SB3-CP6 pack includes six panels, giving you 18U of total blank coverage.

Q: Will the SB3-CP6 fit in any standard 19-inch rack?

A: Yes. The panels are 19 inches (48.3 cm) wide and use a standard flanged two-point mount, compatible with EIA-standard 19-inch rack rails found in Middle Atlantic enclosures and most third-party open-frame and enclosed rack systems.

Q: What is the finish on the SB3-CP6 panels?

A: Textured black powder coat over steel. The texture matches Middle Atlantic's rack enclosure finish for a consistent look in client-facing installations.

Q: Why does the SB3-CP6 come in plain poly bags instead of retail packaging?

A: The SB3-CP6 is a contractor pack — the plain poly bag format keeps cost per panel lower and is practical for integrators stocking multiple panels for job sites rather than end-user retail purchase.

Q: How deep are the SB3-CP6 panels, and will they interfere with cabling behind the rack face?

A: Each panel is 0.52 inches (1.3 cm) deep — shallow enough that they don't meaningfully intrude into usable rack depth. This is a non-issue even in shallow-depth wall-mount enclosures.

Q: Are the SB3-CP6 panels suitable for airflow management in equipment racks?

A: Steel construction means the panels maintain their shape under heat cycling, supporting consistent front-to-back airflow paths in enclosed racks. They are not vented, so they block airflow at the panel face — which is the intended behavior for gap-filling in managed airflow builds.

Eden Phillips

The SB3-CP6 is the kind of SKU that disappears from a job site fast — in a good way. Each of the six flanged steel panels covers 3U at exactly 0.52 inches of depth, which means you're not fighting for cable clearance in tight enclosures. I keep a pack on hand for every multi-rack commission because you always end up with unused bays that need to be closed before client handoff.

Technical Highlights:

• 6-Pack Contractor Format: Six panels per pack in plain poly bags — not retail-boxed, which matters when you're ordering for a job rather than a showroom. At 3U each, one pack covers 18U of gap, enough for most head-end builds with a few panels left over.
• Flanged 2-Point Mount: The flange keeps panels flat and stable over time. In racks that get reconfigured or that see vibration — AV installs near speaker arrays, for example — non-flanged blanks drift and bow. These don't.
• Textured Black Powder Coat: The finish is intentional, not cosmetic afterthought. It matches Middle Atlantic's enclosure series, so your rack face looks like a single coherent system rather than a patchwork of mismatched fillers.

Deployment Considerations:

• Verify your rack's thread spec before pairing with rack hardware — the SB3-CP6 uses a standard flanged mount that accepts M5 or 10-32 screws, but you need to match what your specific enclosure rail accepts.
• These are solid (non-vented) panels. If you're building an enclosed rack with active thermal management and need airflow through the blank bays, you'll want a vented blank panel instead — the SB3-CP6 is the right call when you want airflow blocked at unused gaps.

For security head-end builds in commercial or enterprise environments where multiple racks are commissioned at once and client-facing finish quality matters, the SB3-CP6 contractor pack is the practical, repeat-order choice — not a one-off retail purchase.