B-Line Eaton series open racks, Steel, Telco gray powder coat, 12-24 panel mounting holes, 77 mounting spaces, Top channel style, Seismic Zone 4, ope

The mounting rails are punched and tapped for 12-24 panel mounting screws, not square-hole cage nuts. Any gear you mount needs to accept 12-24 hardware, and if your existing equipment shipped with 10-32 screws, those will not thread into these rails.

The SB5856140TG is built as a Seismic Zone 4 rack, which is the highest of the legacy seismic zone classifications and covers the most active regions. It is an open duct unequal flange design in ASTM A570 grade 33 steel, and it is UL Listed. Zone 4 rating assumes the rack is anchored to the floor and braced per the installation requirements for the room.

Unequal flange means the two flanges of the rail channel are different depths, so equipment mounts on the deeper face while the shallower side leaves room for cable to drop alongside the frame. That is the open duct part: vertical cable pathways stay clear on the rack itself. It suits high-density telco and fiber distribution where patch and jumper volume is heavy. If you need doors, sides, and locking security instead of open cable access, an enclosed cabinet is the wrong-to-right swap, not this frame.

Yes. The SB5856140TG is a top channel rack, meaning the frame terminates in a channel across the top that serves as the tie-in point for overhead cable runway and bracing back to the wall or ceiling. Runway, splice plates, and wall angle are separate items and are not part of the rack.

Order Eaton B-Line MPN SB5856140TG. That number covers the 140 inch tall, 23 inch wide top channel open duct unequal flange frame in telco gray with 12-24 rails and 77 mounting spaces. There is one configuration under that number, so no finish or height suffix to specify.

The rack weighs 108.19 lb. At that weight and 140 inches of length, it is a two-person lift to stand up and a two-person job to hold plumb while the base is anchored. Plan on floor anchors being set before the frame is raised.

Telco gray powder coat over steel, which is the standard color used across telecom equipment frames, so it lines up visually with existing central office and MDF racks. Powder coat on ASTM A570 grade 33 steel holds up in conditioned equipment rooms.