B-Line SB5771138TG Eaton series open frame racks, Steel, Telco gray powder coat, 12-24 panel mounting holes, 51 mounting spaces, Top channel style, Seismic Zone 4, network bay open duct rack, 6 gauge, ASTM A1011SS

Yes. The SB5771138TG is a 19 inch wide open frame rack with 51 mounting spaces of usable rail, so standard 19 inch EIA panels and chassis mount directly to the uprights. Overall height is 138 inches, so confirm your ceiling and any overhead ladder rack or cable tray clearance before you set it.

The rails are punched with 12-24 panel mounting holes, so you need 12-24 rack screws. Equipment shipped with 10-32 or M6 hardware will not thread into these rails, so order 12-24 screws (and cage-free washers if your panels need them) with the rack.

Yes. The SB5771138TG is built as a Seismic Zone 4 network bay open duct rack, which is what a data center or central office spec calls for in the highest seismic design category. It is also UL Listed. The rack still has to be anchored to the slab and braced per the project's structural detail; the rating covers the rack, not the anchorage you supply.

An open frame rack like the SB5771138TG gives you access from all four sides and open cable routing, which is why it is the standard choice in central offices and telecom rooms where the space itself is secured. It has no doors, side panels, or fan provision, so if you need physical security for the gear, dust control, or contained airflow, a locking enclosure is the better call. This one is an open duct network bay in telco gray, built for rows tied together with overhead ladder rack.

The frame is steel, 6 gauge, to ASTM A1011SS. That heavy section is what supports a fully loaded 51 space bay in a seismic application, and it is the number to cite when a submittal asks for rack material and gauge.

It is a top channel rack, so the head of the frame is a channel section made to accept ladder rack hardware and to gang to the next bay in a row. The channel and the open duct design are why this bay is used in continuous rows rather than as a standalone cabinet. Ladder rack, waterfalls, and gang hardware are separate items and are not part of the rack.

It weighs 136 lb as a bare frame. That is a two-person lift at minimum for a 138 inch tall steel frame, and most crews stand it with three: two on the frame and one setting anchors. Plan floor anchoring before the equipment goes in, since the rack is top heavy once loaded.

Finish is telco gray powder coat, the standard gray used across Eaton B-Line network bays, so it lines up visually with existing telco gray equipment racks in the same room. Order model SB5771138TG to repeat it.