B-Line Eaton series open racks, Aluminum, #12-24 mounting hardware, Telco gray powder coat finish, Center mount rack mounted shelf

The SB5962315ATG center mount shelf measures 21.5 inches wide, which is the overall dimension including the mounting flanges that span the rack uprights. That is the normal overall width for a shelf mounting to 19-inch EIA rack rails, where the rails themselves sit on 20-1/4 inch centers. Depth is 15 inches and the shelf occupies 2 inches of vertical space, so it eats roughly one rack unit plus a little.

It is built for #12-24 mounting hardware, which is the thread B-Line uses on its aluminum open frame racks. If your rack uprights are tapped 10-32 instead, the screws that come with the shelf will not thread in, so check the rail tapping before you order.

A center mount shelf hangs from the rack rails with the flanges set back so the shelf load sits centered over the rack footprint rather than cantilevered off the front face. On a two-post open frame rack that keeps the rack balanced, which matters when you are loading gear that is not itself rack-mounted, like small switches, media converters, or a UPS brick. Front or flush mount shelves push the weight forward and are better when you need the shelf face flat with the rack front for cable routing or for gear you access constantly.

Aluminum, with a Telco gray powder coat finish. At 4.3 pounds it is light enough to install single handed, and aluminum will not rust in a damp MDF or basement telecom closet the way a bare steel shelf can. The tradeoff versus steel is load capacity, so for heavy battery or server loads a steel shelf is the better call.

The shelf stands 2 inches tall. A rack unit is 1.75 inches, so plan on two RU of clearance in the rack elevation rather than one, and leave room above for whatever you are setting on it.

Order it as Eaton B-Line SB5962315ATG. That is the single manufacturer part number for the aluminum center mount shelf in Telco gray with #12-24 hardware, so there is no finish or size option to specify alongside it.

The shelf is finished in Telco gray powder coat, the same standard gray used across the Eaton B-Line open frame rack line and the long-standing color convention in telecom rooms. If your racks and wall-mount cabinets are the usual telco gray, this will read as a match. It will not match black or white cabinet gear.

No certification applies to the SB5962315ATG shelf. It is a passive aluminum mounting accessory with no electrical function, so there is nothing to list. The rack and the powered equipment mounted in it are where listings matter.