B-Line SB5878138UTG Eaton series open frame racks, Steel, Telco gray powder coat, 12-24 panel mounting holes, 75 mounting spaces, Top channel style, Seismic Zone 4, network bay closed duct rack, 11 gauge, ASTM A1011SS

The rails are punched with 12-24 panel mounting holes, so your panels, shelves and cable management mount with 12-24 screws. If your existing hardware is M6 or 10-32, you'll need to change screw stock, because these are tapped holes and not universal square-hole cage nut rails.

The SB5878138UTG is built as a Seismic Zone 4 rack, the highest of the legacy seismic zone classifications, and it's UL Listed. It still has to be anchored to the floor and braced overhead per the project's structural details to perform as intended, since a 138 inch bay relies on top bracing.

A closed duct bay like the SB5878138UTG carries an enclosed vertical cable duct integrated into the frame, so jumpers and fiber run protected inside the uprights instead of being strapped to the outside of the rails. A plain open frame relay rack gives you bare uprights and you add separate vertical managers. Choose the closed duct version when you are running heavy jumper counts in a telco frame lineup; a shorter open rack is easier to fit in a low ceiling equipment closet.

It weighs 151.98 lb empty. That is a two-person minimum lift, and realistically a three-person job given the 138 inch length when it comes in lying down. Plan the door and elevator path before it arrives.

Yes, the SB5878138UTG is a top channel style frame, so the top of the bay is set up to tie into overhead ladder rack or cable runway rather than being an open-topped upright pair. Runway, splice plates and floor anchors are separate items you order to suit the lineup.

11 gauge steel to ASTM A1011SS, finished in Telco gray powder coat. That is the standard structural sheet spec for central office framework, and the gray finish matches conventional telco lineups if you are extending an existing row.