B-Line Eaton series open racks, Steel, Telco gray powder coat, 12-24 panel mounting holes, 51 mounting spaces, Top channel style, Seismic Zone 4, ope

The B-Line Eaton series open rack, model SB5857108TG, is drilled and tapped for 12-24 panel mounting holes, so standard rack screws and cage-free 12-24 hardware thread straight into the rails. It gives 51 mounting spaces of usable panel height. If your gear ships with 10-32 screws, order 12-24 hardware to match the rails.

Yes. Model SB5857108TG is built as a Seismic Zone 4 open duct unequal flange rack, and it is UL Listed. The frame is ASTM A570 grade 33 steel. For a Zone 4 job the rack itself is only part of the package, the anchorage and any overhead bracing still have to be engineered for the building, but the rack is the seismic-rated version rather than a standard commercial open frame.

An unequal flange upright puts more material on one side of the rail, which gives you a deeper cable and duct channel on the back of the frame for vertical routing while keeping the front face clear for equipment. That is why it is described as an open duct rack. If you need fully enclosed cable management or a lockable body, an open frame is the wrong choice and you want a cabinet instead.

Top channel means the rack is finished with a channel across the head of the uprights rather than an open top. It ties the two uprights together and gives you a surface to land ladder rack or cable runway and to pick up overhead bracing, which matters on a 108 inch frame in a seismic install.

The uprights are ASTM A570 grade 33 steel, a structural sheet steel grade with a 33 ksi minimum yield, which is the material B-Line specifies for its seismic-rated open frames. Combined with the Seismic Zone 4 rating, that is the structural basis for the rack under load. Distribute heavy gear low in the 51 mounting spaces and anchor the base per your seismic detail.

The finish is Telco gray powder coat, the standard gray used across telecom and network frames, so it lines up visually with existing B-Line open frame racks and most telco-gray runway and ladder rack. Powder coat over steel also holds up better to handling and cable pulls than a wet paint finish.