B-Line SB5774140TG Eaton series open frame racks, Steel, Telco gray powder coat, 12-24 panel mounting holes, 58 mounting spaces, Top channel style, Seismic Zone 4, network bay closed duct rack, Grade 33, ASTM A570

The rails are pre-tapped with 12-24 panel mounting holes, so equipment bolts straight in with 12-24 rack screws. No cage nuts or square-hole clip nuts are involved. If your existing gear is fitted with 10-32 hardware, you'll need to swap to 12-24 screws.

58 mounting spaces, which is 58 rack units of usable panel space across the 140 inch frame. That is well above the 45U a typical 7 foot rack gives you, so it suits high-density telco and network bay runs where you're stacking patch panels and switches in one footprint.

The SB5774140TG is built as a Seismic Zone 4 network bay closed duct rack, Zone 4 being the highest seismic classification and the one that covers most of coastal California. It is also UL Listed. The frame is ASTM A570 Grade 33 steel. For a permitted job, the engineer of record will still want the manufacturer's seismic anchorage detail for your floor construction.

Yes. The rack is 19 inches wide, the standard EIA panel width, so any 19 inch patch panel, switch, or rack shelf mounts to it. The panel holes are 12-24 tapped.

It's a network bay rack with closed duct construction and a top channel style frame. The closed duct gives you enclosed vertical cable pathways in the frame itself rather than open cable rings, and the top channel is what ties bays together and carries the overhead cable runway or ladder rack across a lineup of bays. That's why this style is used for multi-bay telco rows rather than a single standalone rack.

The frame alone is 137 lb. At 137 lb and 140 inches tall, this is a two-person lift minimum, and you want it anchored to the floor before loading any equipment. Account for the frame weight plus equipment load when the structural review looks at your floor.

An open frame rack such as the SB5774140TG gives you access from all sides, free air movement, and the most panel space per footprint, 58 mounting spaces here, which is why telco and MDF rooms use them. Choose an enclosed cabinet instead when you need physical security, dust control, or locking doors, since an open frame offers none of those. In a locked, dedicated equipment room, the open frame is the usual call.

The finish is telco gray powder coat over steel, the standard color used across telecom equipment frames, so it lines up with existing telco gray bays in a lineup. Powder coat over ASTM A570 Grade 33 steel holds up in conditioned equipment rooms.