B-Line Eaton series open racks, Steel, Yellow zinc finish, 12-24 panel mounting holes, 66 mounting spaces, Top channel style, Seismic Zone 4, network

The SB5776138YZ provides 66 mounting spaces on the rails, so you can plan for 66 rack units of panels, patch panels, or switches on a single frame. Rails are punched with 12-24 panel mounting holes, which is the tapped thread most telecom and network gear ships with.

No cage nuts. The B-Line SB5776138YZ rails come punched with 12-24 panel mounting holes, so equipment mounts with 12-24 rack screws directly into the rail. That's different from a square-hole EIA rack, where you'd need cage nuts plus 10-32 or M6 hardware. Order 12-24 screws (and washers if your panels need them) to complete the install.

Yes. The SB5776138YZ is built as a Seismic Zone 4 network bay open duct rack, which is what a California or other high-seismic jurisdiction will look for on a telecom room submittal. It is also UL Listed.

Top channel construction means the two uprights are tied together with a channel across the top, which is where you land ladder rack or overhead cable runway and where the rack picks up its rigidity for a seismic anchor. It's also the reason this is called an open duct rack: cable drops straight in from above with no side panels or door in the way.

An open frame like the SB5776138YZ is the right call when the room itself is secure and locked, you want unrestricted airflow, and you need fast hands-on access to patch fields from both sides. Cable enters from the top through the open duct design. Go with an enclosed cabinet instead when the equipment sits in a shared or public area and needs physical lockable security, or when you need to contain airflow or dust.

Order Eaton B-Line model SB5776138YZ. That number covers the steel frame in yellow zinc, 138 inch height, 23 inch width, 66 mounting spaces with 12-24 tapped holes, top channel style, Seismic Zone 4.

Yes, that's exactly what it's for. The frame is steel to ASTM A1011SS with a yellow zinc finish, which gives corrosion protection in conditioned indoor spaces like an MDF, IDF, or equipment room. It is not a painted architectural finish, so if the rack is going in a visible lobby or classroom, expect the plated look.

The frame itself is 137 lb bare. Plan handling for two people minimum given it is 138 inches long in the carton, and remember your floor load calculation has to add the weight of every switch, patch panel, and cable bundle you hang on the 66 spaces.