B-Line Eaton series open racks, 340 lb, Steel, Telco gray powder coat, 12-24 panel mounting holes, 45 mounting spaces, Top angle style, Seismic Zone

The rails are punched with 12-24 panel mounting holes, already threaded, so equipment mounts with 12-24 rack screws. No cage nuts or square-hole hardware, which means square-hole (universal) accessories and M6 cage nut kits will not work on this frame. Order 12-24 screws to suit.

The frame is built as a Seismic Zone 4 network bay open duct rack, which is the highest seismic zone classification, and it is UL Listed. Zone 4 rating applies to the rack itself; anchoring to the slab per your structural drawings is still part of the install.

Rated load capacity is 340 lb across the 45 mounting spaces. The frame itself weighs 116.37 lb, which matters for the anchor calculation and for getting it upright with two people. Heavy UPS or battery loads should go in a floor-standing enclosure rather than an open two-post frame.

An open duct rack like the SB5861084TG suits a secured telecom or MDF room where you want free air movement, cable access from both sides, and fast patch changes. It gives no physical security and no dust protection, so if the equipment sits in a shared or public space, or needs locking doors and fan cooling, a four-post enclosure is the right choice instead.

Top angle construction means the frame is finished with an angled top member, which gives you a surface to land ladder rack, runway, or overhead cable tray onto and ties adjacent bays together in a row. It is the usual choice for network bay lineups where cable comes in overhead.

Finish is Telco gray powder coat, the standard color used across telecom equipment bays, so a new SB5861084TG lines up visually with existing telco-gray frames. Steel construction is ASTM A570 grade 33.