B-Line SB5858138UTG Eaton series open frame racks, Universal spacing, Steel, Telco gray powder coat, 12-24 panel mounting holes, 75 mounting spaces, Top channel style, Seismic Zone 4, network bay closed duct rack

75 mounting spaces, on a frame 138 inches tall. That is a tall network bay, so check your ceiling height and any overhead cable tray or sprinkler clearance before you commit to it. Panel mounting holes are tapped 12-24, so your equipment screws and any cage-nut-free panels need to match that thread.

Yes. The SB5858138UTG uses universal hole spacing on the mounting rails, which is the pattern standard 19 inch EIA panels, patch panels and rack-mount switches are punched for. The holes are threaded 12-24, so order 12-24 rack screws rather than 10-32.

It is built as a Seismic Zone 4 network bay closed duct rack, which is the highest of the legacy zone classifications. It is also UL Listed. Zone 4 framing still has to be anchored to the floor, and in many cases braced overhead, per the engineer's detail on your drawings.

The frame is 23 inches wide and the stated depth figure is 138 inches; height is also 138 inches. Weight is 107.13 lb bare, before any equipment load. Lay out your aisle clearance from the 23 inch width plus whatever your local code requires in front and behind.

An open frame like the SB5858138UTG gives you access from all four sides and free airflow, which is why it is the normal choice in a dedicated, locked telecom or MDF room where physical security is handled by the door. Go to an enclosed cabinet instead when the gear sits in a shared space, a corridor, or anywhere you need lockable doors and side panels. The open frame will not accept those.

The SB5858138UTG is a top channel design, which gives you a structural channel across the top of the bay to land runway, ladder rack, or overhead bracing on rather than hanging it off the uprights. On a Zone 4 installation that top connection is usually where the overhead brace ties in.

Plan on floor anchors sized by your structural detail, 12-24 rack screws for every panel and device you mount, and vertical or horizontal cable management if you want the closed duct sides dressed. The rack ships as the frame itself, model SB5858138UTG, with 12-24 tapped panel holes.

Telco gray powder coat over steel. Powder coat holds up to cable pulls and equipment scuffing better than wet paint, and telco gray is the standard shade used across B-Line series bays, so a rack added later will match a row already installed.