Middle Atlantic UMS1-3.5 1U Universal Rack Shelf 3.5in Deep
Overview
The Middle Atlantic UMS1-3.5 is a 1U, 3.5-inch-deep universal rack shelf designed for mounting shallow equipment in standard 19-inch rack enclosures. At only 1.75 inches tall (1 rack unit), it occupies minimal vertical real estate — useful in dense AV and security racks where every unit counts. The 25 lb weight capacity handles most small signal processors, media converters, and compact appliances without flex. This is a shelf-only configuration: no cage nuts or panel-mount cutouts, just a flat tray with two mounting points to drop into any Middle Atlantic rack or compatible 19-inch EIA-standard frame. The UMS1-3.5 addresses the common scenario where a device lacks rack ears or has its own chassis but needs a stable, fixed position in the rack rather than sitting loose on a cable shelf.
Compatibility
Fits any 19-inch EIA-310-D compliant rack frame — including Middle Atlantic rack enclosures, open-frame racks, and third-party 19-inch cabinets. The 3.5-inch depth suits compact gear such as small PoE injectors, media converters, single-port serial devices, and low-profile wireless access controllers. Not suited for equipment deeper than 3.5 inches; for deeper components, step up to a longer shelf variant in the rack shelf lineup. Two front mounting points secure the shelf to the rack rails — standard square-hole or round-hole rails both work with appropriate rack hardware.
Installation Notes
Shelf mounts at the front rails only (2 mounting points); rear support depends on equipment weight distribution. At 25 lb max capacity, avoid stacking heavy gear near the front edge without rear-rail or side-panel bracing. The black powder-coat finish matches standard Middle Atlantic rack aesthetics. Shipping weight is 1.65 lbs — light enough to handle single-handed during install. No tools beyond a standard screwdriver are required; rack hardware not confirmed in evidence, verify included fasteners before deployment in rack mounting applications.
