B-Line Eaton series open racks, Used to mount electronic switching equipment, Steel, Telco gray powder coat, 12-24 panel mounting holes, 67 mounting

The SB5859140TG gives you 67 mounting spaces on rails punched with 12-24 panel mounting holes. That is the tapped-rail style used for telco switching gear, so panels thread directly into the rail without cage nuts.

Yes. It is built as a Seismic Zone 4, closed duct unequal flange rack, which is the configuration specified for California and other high seismic regions where the frame has to be anchored to floor and overhead bracing. The rack is also UL Listed.

No cage nuts here. The rails come with 12-24 tapped panel mounting holes, so equipment and panels bolt straight in with 12-24 screws. If your gear ships with square-hole cage nut hardware, you will need 12-24 rack screws instead.

Unequal flange means the two legs of the rack upright are different widths, so the mounting flange sits deeper on one side than the other. On the SB5859140TG that is paired with a closed duct design, giving you an enclosed vertical cable path inside the upright instead of open cable running down the face. Central office and switching rooms spec it to keep cross-connect wiring protected and out of the equipment plane.

The rack is a double sided configuration, so mounting rails are available front and rear rather than a single equipment plane. Mounting holes are 12-24 tapped throughout.

Yes, it is a top channel style frame. The channel across the top of the uprights is what you tie overhead cable runway and auxiliary framing to, which is also part of how the rack gets braced in a Seismic Zone 4 install.

An open frame rack such as the SB5859140TG is meant for mounting electronic switching equipment in controlled rooms, where you want full access to both sides and unrestricted airflow. It has no doors or side panels, so it gives no physical security and no dust protection. If the equipment sits in a shared or public space, or needs to be locked, an enclosed cabinet is the right call instead.

Finish is Telco gray powder coat over steel, the standard color used across switching and central office frames, so it lines up visually with existing telco-gray lineups. Powder coat over steel also holds up better than paint in a high-traffic equipment room.