B-Line B32SH-120SS4 Eaton series strut channel, 1.37" channel height, 120" channel length, 1.62" channel width, Steel, 12 Gauge, SH hole pattern, B32 channel type, Stainless steel type 304

It is type 304 stainless steel, not a coating over carbon steel. That matters for wash-down areas, food processing, coastal and exterior runs, water treatment and pool rooms, where galvanized strut will eventually bleed rust. If your job is dry indoor commercial work, plain pre-galvanized channel is the cheaper spec and 304 is more than the application needs.

Yes. B32 carries the 1.62 inch face, which is the standard 1-5/8 inch strut opening, so spring nuts, channel nuts, conduit clamps, pipe straps and post bases sized for 1-5/8 inch strut engage the lips normally. In a stainless installation, match the fittings and hardware to 304 as well; mixing zinc-plated nuts into stainless channel in a wet or coastal environment gives you corrosion at every fastener.

SH is the short-slot pattern, so the back of the channel is punched rather than solid. That lets you bolt the strut through to structure anywhere along the run without drilling on site, which is the usual reason electricians and mechanical contractors pick a punched back over plain channel for conduit racks and trapeze hangers.

B32 at 1.37 inches deep is the shallower section, and it is the right call where clearance is tight, loads are light to moderate, or you are building short trapeze spans and uprights. For long unsupported spans or heavy multi-conduit and pipe loads, the deeper full-height 1-5/8 by 1-5/8 channel gives you more section depth to work with. Both share the same 1.62 inch face, so fittings carry over between them on the same job.

Order Eaton B-Line B32SH-120SS4. Reading the code: B32 is the channel type, SH is the slot pattern, 120 is the length in inches, and SS4 designates type 304 stainless. The SS4 suffix is the part to watch, since the same B32SH-120 body is built in other finishes and the stainless version is a different order line.