B-Line Eaton series strut channel, 1.62" channel height, 120" channel length, 1.62" channel width, Steel, 12 Gauge, B22 D channel type, Stainless stee

It's type 304 stainless steel, not a coating over carbon steel. That matters if you're mounting in a wash-down area, a coastal or exterior location, a water treatment plant, or a food facility where galvanized strut would eventually bloom rust. The channel is 12 gauge, 1.62 inches by 1.62 inches in section.

B22 is the 1-5/8 inch profile, listed here as 1.62 inches high by 1.62 inches wide, so it takes the standard 1-5/8 inch strut nuts, clamps, brackets and hardware the trade uses on that size. If your drawings call out 1-5/8 x 1-5/8 12 gauge channel, this is that section, in 304 stainless.

12 gauge is the heavier of the two common wall thicknesses and is what gets specified for structural pipe racks, trapeze hangers carrying conduit or process piping, and equipment supports where deflection matters. 14 gauge is the lighter-duty version used for light fixture hangers, small conduit runs, and general mounting. This B22 channel is 12 gauge, so it's on the heavy-duty side of the range.

You can physically, but you shouldn't in the environment that made you choose stainless in the first place. Mixing plated carbon steel hardware with a 304 stainless channel puts dissimilar metals in contact in a wet setting, and the fastener corrodes first, which is what fails the joint. Spec stainless channel nuts, bolts and fittings to match the 304 channel.

The manufacturer part number is B22D-120SS4 from Eaton's B-Line series. The D designation is the channel type within the B-Line line, in the 1.62 inch B22 section, 12 gauge, 120 inches long, type 304 stainless. Quote that full MPN rather than just B22, since B22 alone doesn't pin down the length, gauge variant or material.

If what's already up is 1-5/8 inch channel, yes, the profile matches: this is the B22 section at 1.62 by 1.62 inches, so the same brackets, clamps and channel nuts carry over between the old runs and new stainless runs. The difference is the material, 304 stainless rather than plated or painted carbon steel, so use it where corrosion is the problem and keep the cheaper finish for dry interior areas.