B-Line SB5856140UTG Eaton series open frame racks, Universal spacing, Steel, Telco gray powder coat, 12-24 panel mounting holes, 77 mounting spaces, Top channel style, Seismic Zone 4, open duct unequal flange rack

The SB5856140UTG gives 77 mounting spaces of usable rail, on a frame 140 inches tall. That is a tall, full-height open rack, so check your ceiling height and any overhead cable tray or sprinkler clearance before you commit to it. If your room can't take 140 inches of upright, you need a shorter rack in the same series, not this one.

Rails are tapped 12-24 panel mounting holes on universal spacing. So your panels and equipment need to mount with 12-24 screws, not cage nuts and not 10-32. Universal spacing means the hole pattern repeats on the standard EIA rack unit sequence, so standard 19 inch rack-mount gear lands on it.

It is built as a Seismic Zone 4 rack, which is the highest of the legacy zone classifications and what specifiers call out for high seismic regions. The rack is also UL Listed. As with any seismic rack, the rating depends on it being anchored to the floor per the manufacturer's detail, so your structural anchorage still has to be installed as designed.

Open frame, not a cabinet. There are no side panels, no doors, and no locking enclosure, just the uprights with tapped 12-24 rails and a top channel. If you need physical security on the gear or airflow containment, you want an enclosed cabinet instead. Open frame is the usual pick for patch and cross-connect fields where access from all sides matters.

Unequal flange means the two flanges of the upright channel are different widths, so the deeper flange faces out and gives you more room to route and lash cable alongside the rails. The open duct construction leaves the channel open for that cabling. Pick it where you are terminating a lot of copper or fiber on the rack and want vertical cable management inside the upright. An equal flange rack is the simpler choice when the rack carries a few chassis and cable volume is low.

Published dimensions are 140 inches height, 23 inches width, and 140 inches for length/depth. Use the 23 inch width for row spacing and aisle layout. The frame weighs 108.19 lb bare, before any equipment load.

This is the top channel style rack, so the top channel is part of the frame configuration. That channel is what you tie overhead ladder rack or runway into. You still order the ladder rack, runway kits, and floor anchors separately, along with any vertical cable manager, shelves, or power strips you need to finish the install.

Order Eaton B-Line part number SB5856140UTG. That single number covers the configuration: universal spacing, steel, telco gray powder coat, 12-24 holes, 77 mounting spaces, top channel, Seismic Zone 4 open duct unequal flange.

The finish is telco gray powder coat, the standard color used across telecom and data equipment racks, so it lines up visually with existing telco-gray rack rows and ladder rack. The frame itself is steel under the powder coat.