B-Line SB5858138TG Eaton series open frame racks, Steel, Telco gray powder coat finish, 12-24 panel mounting holes, 75 mounting spaces, Top channel style, Seismic Zone 4, network bay closed duct rack

The SB5858138TG is built as a Seismic Zone 4 network bay closed duct rack, so it is the configuration to specify where the structural drawings call out Zone 4 anchorage for telecom bays. It is also UL Listed.

The rails are punched with 12-24 panel mounting holes, so all your gear mounts with 12-24 rack screws, the common telco thread. Nothing here is 10-32 or square-hole cage nut, so do not order M6 cage nuts for it. Confirm the screws and any cable management you want are on the same order, since the frame itself is the rails and channel.

A closed duct bay routes and protects cable inside the vertical duct sections of the frame, which is what you want on a high-density network bay carrying large patch fields. A plain open frame relay rack is simpler and cheaper to install but leaves you adding separate vertical cable managers on both sides. If the room is a main cross-connect with heavy copper counts, the closed duct version like the SB5858138TG saves you that add-on work; for a few switches in a small IDF, an open frame is enough.

Top channel construction means the bay is finished with a channel across the top of the uprights, which is the tie point for auxiliary framing, overhead ladder rack, or bracing back to the wall or structure. On a Zone 4 installation that top connection is what carries the lateral load, so plan the overhead runway and bracing to land there.

Order it as Eaton B-Line SB5858138TG. That single part number covers the Telco gray, 12-24 punched, 75 space, Seismic Zone 4 closed duct bay; there are no finish or height options to pick on it.

The finish is Telco gray powder coat over steel, the standard color used across telecom bay lineups, so it lines up visually with existing Telco gray frames and duct in the same row. Powder coat over steel also holds up in unconditioned service rooms better than a painted finish.

Stated weight is 107.13 lb. That is manageable for two people to carry flat, but at 138 inches tall it is awkward rather than heavy, so handle it as a two or three person lift and keep it braced until it is anchored to the floor and the overhead runway.