B-Line Eaton series strut back-to-back welded channel, 1.62" channel height, 120" channel length, 1.62" channel width, Steel, 12 Gauge, B22 channel ty

The B22A-120SS4 is type 304 stainless steel, so the corrosion resistance runs through the material, not a plated or painted surface. That is what makes it usable outdoors, in wash-down areas, food processing spaces, coastal sites and wastewater plants where painted or plain galvanized strut rusts at every cut and drill point.

The channel is 1.62 inches across the face, which is the standard 1-5/8 inch strut opening, so conventional 1-5/8 spring nuts, channel nuts, clamps and fittings engage the lips normally. One caution for the trades: pair stainless channel with stainless nuts, bolts and fittings. Hanging plated carbon steel hardware on 304 channel in a wet or corrosive location puts dissimilar metals in contact and the plated parts will be the first thing to fail.

B22 is two channels welded back to back, giving a closed box section with slot openings on both faces. A single channel bolts flat against a wall or ceiling and takes load in one direction. Back-to-back is what you use for free-standing trapeze runs, pipe racks, and posts where the member spans between supports and has to resist bending without a structure behind it. This piece measures 1.62 inches in both height and width, so the overall profile is a square section rather than the deeper section you get from a 1-5/8 by 3-1/4 back-to-back.

12 gauge steel, which is the standard structural thickness for B-Line strut rather than the lighter 14 or 16 gauge used for light-duty runs and sign framing. Combined with the welded back-to-back B22 section, that is what carries trapeze hangers for conduit banks, cable tray and piping over longer spans.

Yes, the 120 inch stick is meant to be cut to suit. Use a cutting wheel or blade reserved for stainless only. A wheel that has touched carbon steel leaves iron particles embedded in the 304 surface and those will bloom into rust spots that look like the stainless has failed. Deburr and passivate or at least clean the cut end, since the cut face is the most exposed part of the run.