Middle Atlantic 5 Space (8 3/4IN. ) Captivator Shelf (Clamping Rackshelf) KD Construction - CAP5

Middle Atlantic CAP5 5U Clamping Rackshelf — Captivator Series

The Middle Atlantic CAP5 is a 5-space (8¾ in.) clamping rackshelf built for integrators who need a solid, fixed-depth equipment platform inside open-frame or enclosed rack enclosures. At 100 lbs rated capacity and 15.1 in. of usable depth, the CAP5 handles real-world rack loads — NVRs, servers, UPS units, and heavy AV gear — without flex or sag. If you're specifying Middle Atlantic rack infrastructure for a security or AV installation, this shelf is a workhorse that installs in minutes and stays put.

Key Features

• 100 lb (45.4 kg) Weight Capacity: Most 5U shelves in this class are rated at 50–75 lbs. The CAP5's 100 lb rating means you can drop a full-size NVR or a dense UPS unit on it without worrying about the shelf deflecting over time — relevant when rack equipment runs 24/7 for years.
• 15.1 in. (38.4 cm) Usable Depth: The full shelf depth is 15.37 in., but usable depth — the figure that actually matters for equipment fitment — is 15.1 in. That accommodates most 1U through 5U chassis without forcing equipment to overhang the rear rail. Verify your chassis depth against this number before specifying deeper gear.
• Clamping (Captivator) Design — 2 Mounting Points: The Captivator clamping system secures equipment without requiring traditional slide rails or full-length rail engagement. Two mounting points mean fast, tool-minimal installation inside open-frame rack accessories and enclosed cabinets. This is the design detail that speeds up commissioning when you're dropping in a late-arriving component.
• 5 RU Height (8.75 in. / 22.2 cm): Five rack units gives the shelf a deep interior clearance profile — enough headroom for tall chassis lids or equipment with raised ventilation bumps. Standard 19 in. EIA-310 width (48.3 cm) means it drops into any compliant rack without modification.
• 19 in. Width (48.3 cm) — EIA Standard: Fits any EIA-310 compliant open-frame rack or enclosed cabinet. No adapter brackets, no width shimming. This is the spec that makes the CAP5 universally compatible with the racks most integrators already have on site.
• KD (Knock-Down) Steel Construction with Black Powder Coat: KD construction means the shelf ships flat and assembles on-site — practical for high-rise installs where freight elevator dimensions matter. Steel with black powder coat finish holds up in telecom closets and equipment rooms where humidity fluctuates and bare metal would corrode over time.
• Shipping Weight 11 lbs (5 kg): Light enough for a single technician to handle and position inside the rack without assistance. In multi-rack deployments where you're populating 10 or 20 shelves, the ergonomics of an 11 lb component versus a 20 lb alternative actually matter by the end of the day.

Integration and Compatibility

The CAP5 is designed for standard 19-inch EIA-310 rack infrastructure — open-frame, relay, and enclosed cabinet formats all apply. The 15.1 in. usable depth covers the majority of 1U–5U rack-mount chassis on the market, including most network video recorders, managed PoE switches, and rackmount UPS units commonly deployed in physical security infrastructure. If you're building out a network video recorder stack or a structured cabling head-end, the CAP5 gives you a clean, load-rated platform to work from. For deeper chassis (16 in. or beyond), measure twice — the 15.1 in. usable depth is a hard ceiling. Pair with compatible rack mounting hardware for full system build-outs.

Frequently Asked Questions

Q: What is the maximum weight the CAP5 can support?

A: The CAP5 is rated for 100 lbs (45.4 kg). This covers most rack-mount NVRs, servers, and UPS units deployed in security and AV installations.

Q: What rack sizes is the CAP5 compatible with?

A: The CAP5 is 19 inches wide (48.3 cm), designed for standard EIA-310 19-inch open-frame racks and enclosed cabinets. It occupies 5 rack units (8.75 in.) of vertical space.

Q: What is the usable depth of the CAP5 shelf?

A: Usable depth is 15.1 inches (38.4 cm). The total shelf depth is 15.37 inches, but account for the clamping hardware when measuring equipment fitment. Equipment deeper than 15.1 inches will not sit flush.

Q: How does the Captivator clamping system work?

A: The CAP5 uses a clamping mount design (Captivator series) with 2 mounting points that secure to the rack rail without requiring full slide-rail engagement. This simplifies installation and allows faster equipment swap-out compared to traditional slide-rail shelves.

Q: Does the CAP5 ship pre-assembled or as a kit?

A: The CAP5 uses KD (knock-down) construction, meaning it ships flat and is assembled on-site. This reduces shipping dimensions and makes it easier to transport to upper-floor or elevator-restricted installations.

Q: What finish does the CAP5 have?

A: Black powder coat finish over steel. This is a durable finish appropriate for equipment rooms and telecom closets where the shelf will see long-term use.

Marty Allison

The spec that stands out on the CAP5 for me is the 100 lb weight capacity — that's meaningfully higher than the 50–75 lb ceiling you see on many comparable 5U shelves, and it matters when you're racking a dual-PSU NVR or a mid-size UPS alongside network hardware. I've seen integrators spec lighter shelves to save a few dollars and then find themselves re-racking when the load exceeds ratings under real operating conditions.

Technical Highlights:

• 100 lb Capacity: Handles the full weight range of 1U–5U rack-mount security appliances, including dense NVR chassis and UPS units, without deflection over a multi-year service life.
• 15.1 in. Usable Depth: Fits the overwhelming majority of rack-mount chassis in the security and AV market — measure your deepest component first, because 15.1 in. is the hard limit.
• KD Steel Construction: Ships flat, assembles on-site — practical for high-rise and retrofit jobs where you can't get a pre-assembled rack up a freight elevator.

Deployment Considerations:

• The clamping design with 2 mounting points is fast to install, but confirm your rack rail gauge is compatible before ordering — the Captivator clamping system is optimized for Middle Atlantic and standard EIA rail profiles.
• 19 in. width and 5 RU height are non-adjustable — if your rack bay has less than 5U of open space remaining, you need a smaller shelf model from the same family.

The CAP5 is the right call for security head-end equipment rooms where you're stacking NVRs, managed switches, and UPS units in a single rack bay and need a load-rated, fast-install platform that won't require revisiting in three years.