Middle Atlantic Cabinet with back sides & top Castors ***Drop Ship Only*** - PTRK-21

Middle Atlantic PTRK-21 21RU Portable Rolling Rack Cabinet

The Middle Atlantic PTRK-21 is a 21-rack-unit portable rolling enclosure built for integrators who need to move fully populated gear — switching, recording, and processing equipment included — without bolting anything to a wall or floor. At 500 lbs rated capacity and 21.5 inches of usable depth, the PTRK-21 handles dense security and AV head-end builds that require mobility: staging areas, temporary command posts, touring production, and multi-tenant facilities where equipment rooms shift between tenants. This is a Middle Atlantic product sourced through US distribution channels — factory-new, genuine, no grey-market units.

Key Features

• 21 Rack Units (36.75" usable height): Enough vertical space for a full security head-end — NVR, PoE switch, UPS, patch panel, and KVM — without stacking into a second enclosure. The 36.75-inch usable interior keeps cabling manageable when every U matters.
• 500 lb weight capacity: Purpose-built for real loads. A fully populated network video recorder chassis, a 1U UPS, and a 24-port switch can easily push 150–200 lbs. At 500 lbs rated, the PTRK-21 has headroom for dense configurations without operating near its structural limit.
• 21.5" usable depth: Accommodates standard 1U–4U rack-mount equipment up to roughly 20 inches deep. Most enterprise-grade NVRs, servers, and UPS units fit without modification. Measure your deepest chassis before committing — units exceeding 21 inches will require cable management workarounds at the rear.
• Castors (factory-fitted): The rolling base is included — not a separate kit. This matters on job sites where you're repositioning a 200-lb populated rack between staging and final location. Confirm floor type before routing: standard rubber castors on uneven concrete require extra effort compared to finished floors.
• 10-32 rack rail threading: The industry-standard thread for 19-inch rack equipment. All standard rack nuts, cage nuts, and rack-mount screws compatible with 10-32 are drop-in compatible — no adapter sets needed. Pair with a rack accessory kit if your equipment ships with metric hardware.
• TAA compliant, manufactured in Mexico: Qualifies for GSA Schedule and federal procurement under the Trade Agreements Act. The country of origin (Mexico) is documented and verifiable — relevant if your project has Buy American Act or Federal Acquisition Regulation reporting requirements.
• External dimensions — 22.59" W × 45.91" H × 23.93" D: Fits through a standard 36-inch commercial door with margin. Verify elevator and doorway clearances before delivery on multi-floor installs — 45.91 inches tall with castors means standard interior door frames (80 inches) are not an issue, but tight server room entries may need measurement.

Integration and Compatibility

The PTRK-21 is a passive enclosure — it houses and transports rack-mount equipment but introduces no active signal path. Any 19-inch EIA-310-compliant equipment mounts directly on the 10-32 threaded rails. This includes rack-mount NVRs, managed PoE switches, patch panels, UPS battery units, KVM switches, and AV processing gear. Cable entry is through open top and rear; integrate with blanking panels and cable managers from the Middle Atlantic accessory line to maintain airflow discipline in fully loaded builds. The 21.5-inch usable depth aligns with shallow-to-mid-depth deployments — ultra-deep blade servers or extended-depth storage arrays may require a deeper enclosure. Consult your equipment datasheets for chassis depth before ordering. For permanent room installations requiring full enclosure with doors and venting, review other rack form factors in the server racks and enclosures category.

Frequently Asked Questions

Q: Is the PTRK-21 TAA compliant for federal and government procurement?

A: Yes. The PTRK-21 is TAA compliant, with a documented country of origin of Mexico, qualifying it for GSA Schedule and federal agency procurement under the Trade Agreements Act.

Q: What is the maximum weight the PTRK-21 can support?

A: The PTRK-21 is rated for a 500 lb (226.8 kg) weight capacity — sufficient for fully populated security or AV head-end builds including NVRs, switches, and UPS units.

Q: What rack rail thread does the PTRK-21 use?

A: The PTRK-21 uses 10-32 threaded rack rails, the standard for 19-inch rack-mount equipment. Standard 10-32 rack hardware is directly compatible.

Q: Will the PTRK-21 fit through a standard commercial doorway?

A: At 22.59 inches wide and 45.91 inches tall (with castors), the PTRK-21 fits through standard 36-inch commercial doors. Measure tight server room entries and elevator doors on multi-floor installations before delivery.

Q: How much usable rack space does the PTRK-21 provide?

A: The PTRK-21 provides 21 rack units of vertical space with 36.75 inches of usable interior height and 21.5 inches of usable depth. Most standard rack-mount equipment up to approximately 20 inches deep mounts without modification.

Q: Are the castors included, or purchased separately?

A: Castors are factory-fitted on the PTRK-21 — they are part of the unit as delivered, not a separate add-on kit.

Karl Wilson

The PTRK-21 (often searched as PTRK 21) comes up regularly when integrators are staging a multi-camera security install and need to bench-test the full head-end before it goes into the equipment room. The 500 lb capacity is the number I look at first — that's not marketing; that's the structural limit you're trusting when you roll a fully populated rack down a loading dock ramp.

Technical Highlights:

• 21.5" usable depth: Covers the vast majority of 1U–4U rack-mount security and AV equipment. If you're loading enterprise-class NVRs or extended-depth servers, verify chassis depth against this number before the gear ships — returning a populated rack is not a quick fix.
• 10-32 rail threading: Every standard rack nut and screw in your field kit works here. No adapters, no surprises mid-install. If a vendor ships metric hardware, have a 10-32 conversion set on the truck.
• TAA compliance, Mexico origin: Documented and verifiable — this matters on any federal, state, or municipal project with FAR/TAA language in the scope of work. Pull the compliance documentation before bid submission, not after award.

Deployment Considerations:

• At 45.91 inches tall with castors, the PTRK-21 clears standard 80-inch interior doors easily, but measure elevator cab depth and server room entry widths (22.59 inches wide) on any multi-floor or tight-entry installation before the unit ships — drop-ship-only means no easy same-day return.
• The enclosure ships without doors, side panels, or a top — appropriate for mobile/staging use where airflow matters, but factor in cable dressing and blanking panel discipline on fully loaded builds to maintain thermal performance on heat-sensitive equipment.

For touring production, temporary command centers, or security staging labs where the same head-end moves between sites on a regular rotation, the PTRK-21 is the right form factor — the capacity and depth cover real-world builds without over-engineering a solution that was never meant to stay in one place.