Middle Atlantic 18 Space Rotating Sliding Rail System 250 Lb Capacity - SRSR-4-18

Middle Atlantic SRSR-4-18 18U Rotating Slide-Out Rack System

Overview

The Middle Atlantic SRSR-4-18 is an 18-rack-unit rotating sliding rail system built for integrators who need full rear-panel access without pulling equipment or opening adjacent cabinet doors. Rated at 250 lbs (113.4 kg), it handles densely loaded AV, security, and IT buildouts — the kind of weight you accumulate when a rack carries NVRs, patch panels, power distribution, and network gear simultaneously. The flat black powder coat finish matches standard rack furniture, and the 10-32 tapped rail pattern accepts the full range of commercial rack hardware.

At 19.13 in wide and 19.14 in deep, the SRSR-4-18 (often searched as SRSR 4 18) fits standard 19-inch cabinet bays. Usable mounting depth is 17.25 in — enough for most 1U switches, NVRs, and server appliances without adapter rails. Usable height spans 31.5 in across the 18 RU of mounting space.

Key Features

• 250 lb Weight Capacity: At 250 lbs (113.4 kg), this rail system handles fully loaded security and AV racks — think stacked NVRs, power distribution units, and dense patch fields — without flexing under load. If your rack approaches that ceiling, plan ballast distribution from the bottom up.
• 18 Rack Units of Usable Space: 18 RU translates to 31.5 in of usable height — enough to house an NVR, a PoE switch, a UPS module, and a patch panel in a single pull-out chassis. No need to split a system across multiple enclosures to gain rear access.
• Slide-Out and Rotate Mechanism: The assembly slides out of the cabinet and rotates, putting every rear-panel port, cable, and termination point within arm's reach. In enclosed equipment rooms with limited aisle width, this is the practical alternative to building swing-out doors into the cabinet design.
• 17.25 in Usable Depth: The 17.25 in (43.8 cm) usable depth accommodates standard 1U rack appliances without extension rails. Measure your deepest piece of gear before specifying — anything over 17 in will overhang or require a deeper cabinet pairing.
• 10-32 Tapped Rail Pattern: The 10-32 rack rail type is the commercial standard for AV and security rack hardware. Your existing cage nuts, screws, and blanks will transfer directly — no adapter kits, no re-ordering fasteners.
• Flat Black Powder Coat Finish: The powder coat matches standard Middle Atlantic and competitive rack furniture. Consistent appearance matters in client-visible equipment rooms and in installations where mismatched finishes flag poor workmanship during site walks.
• TAA Compliant, USA-Made: Federal origin listed as USA and TAA compliant — covers government, DoD, and GSA contract work where domestic sourcing is a hard requirement. Verify your procurement vehicle before substituting with a non-TAA alternative.
• In-Cabinet Rack Type: Designed specifically for in-cabinet deployment, not freestanding use. The rotating slide-out function depends on the cabinet providing the structural frame — this is not a standalone open-frame rack.

Integration & Compatibility

The SRSR-4-18 installs inside standard 19-inch equipment cabinets. The 10-32 rail pattern is compatible with the full range of Middle Atlantic rack accessories — shelves, blanks, power distribution, and cable management — as well as third-party hardware following the EIA-310 standard. The 19.13 in width and 19.14 in depth dimension the unit for standard cabinet bays; verify your cabinet's internal clearance and door-swing envelope before ordering, as the rotation arc requires lateral clearance on at least one side. At 97.2 lbs (44.1 kg) shipping weight, two-person installation is the practical minimum — factor that into your site crew planning. For rack systems across the Middle Atlantic line, the SRSR-4-18 pairs with standard Middle Atlantic cabinets and power distribution units that conform to the same rail pattern. Integrators specifying government or public-sector installations should confirm TAA compliance documentation is available for the full bill of materials, not just this unit. Browse the full Middle Atlantic rack and enclosure catalog for compatible cabinets, cable management, and PDUs. If you are planning a network equipment build-out requiring structured rear-access, the sliding rotation mechanism significantly reduces service time compared to fixed-rail alternatives. See the rack and enclosure buying guide for guidance on cabinet depth, load planning, and rail pattern selection.

Frequently Asked Questions

Q: What is the weight capacity of the SRSR-4-18?

A: The SRSR-4-18 is rated at 250 lbs (113.4 kg). Plan your equipment load distribution from the bottom of the rack upward to keep the center of gravity low when the assembly is extended and rotated.

Q: Is the SRSR-4-18 TAA compliant?

A: Yes. The SRSR-4-18 is TAA compliant with a Federal Operations country of origin listed as USA, making it eligible for GSA schedule and government contract procurement vehicles that require domestic sourcing.

Q: What rail pattern does the SRSR-4-18 use?

A: It uses 10-32 tapped rails, the commercial standard for AV and security rack hardware. Standard rack screws, cage nuts, and blanks are directly compatible — no adapter hardware required.

Q: What cabinet type is required for the SRSR-4-18?

A: The SRSR-4-18 is an in-cabinet rack system — it requires a host cabinet to provide the structural frame. It is not designed for freestanding or open-frame deployment. Verify that your cabinet provides adequate internal clearance for both the 19.13 in width and the rotation arc.

Q: How much usable mounting depth does the SRSR-4-18 provide?

A: Usable depth is 17.25 in (43.8 cm). Equipment deeper than 17 in will overhang the rail or require a deeper paired cabinet. Measure your deepest appliance — NVRs and UPS units are the most common overhangs.

Q: How many rack units does the SRSR-4-18 support?

A: 18 RU of mounting space with 31.5 in (80 cm) of usable height. This accommodates a typical mid-density security system build — NVR, managed switch, PDU, and patch panel — in a single pull-out chassis.

Eden Phillips

The SRSR-4-18 earns its place on any job where the equipment room is tight and the rack is dense. That 250 lb capacity rating is the number I keep coming back to — in a fully loaded 18 RU build with redundant power, a mid-range NVR, a managed PoE switch stack, and structured cabling panels, you can realistically hit 180–220 lbs. The SRSR-4-18 handles that without compromise, and the slide-and-rotate mechanism means you are not disassembling cables to reach the back of a switch when a port goes down at 2 AM.

Technical Highlights:

• 250 lb Capacity: Supports fully loaded 18 RU builds — typical security system racks (NVR + PoE switch + PDU + patch) land well within this ceiling, leaving margin for future adds.
• 17.25 in Usable Depth: Fits standard 1U appliances without extension rails; anything beyond 17 in needs to be measured explicitly — this is the most common spec integrators overlook at bid time.
• TAA / USA-Origin: Covers federal and GSA contract requirements without sourcing a different SKU — bake this into your standard government-site BOM and avoid last-minute substitutions during procurement review.

Deployment Considerations:

• The 97.2 lb shipping weight means two-person installation is a practical requirement, not a suggestion — factor that into your site crew schedule, particularly for above-floor or raised-access deployments.
• The rotation arc requires lateral clearance inside the cabinet bay; in tight multi-cabinet rows with zero aisle space, verify the rotation envelope clears adjacent cabinets before the unit ships to site.

This unit is the right specification for a government facility or corporate security operations center build where TAA compliance is non-negotiable, the rack load is heavy, and the equipment room does not have the aisle depth for conventional rear-panel service access.