B-Line Eaton series strut back-to-back welded channel, 2.43" channel height, 240" channel length, 1.62" channel width, Steel, 12 Gauge, B12 channel ty

It's a back-to-back welded channel, meaning two B12 strut sections welded spine to spine to form a closed box profile. That's why the overall section measures 2.43 in in height and 1.62 in in width, with slots facing out on both sides. Use it where a single channel would deflect too much on long spans or where you need to hang or attach on two opposing faces, such as trapeze supports and freestanding racks.

The finish is hot-dipped galvanized steel, which is the finish specified for exterior, damp, and corrosive-duty runs, rooftop equipment supports, parking structures, and wash-down areas. Cut ends are raw steel once you saw the stick, so field cuts should get a cold galvanizing compound to keep the protection continuous.

Yes. B12 is B-Line's 1-5/8 in strut profile, so the 1.62 in channel width matches the industry-standard 1-5/8 in slot opening that ordinary strut nuts, spring nuts, clamps, post bases, and angle fittings are made for. Buy the galvanized or plated hardware to match the hot-dip finish if the run is outdoors.

12 gauge steel, which is B-Line's standard heavy-duty strut thickness rather than the lighter 14 or 16 gauge material used for light fixture and small conduit hangers. Combined with the welded back-to-back section, that's the makeup for trapeze hangers carrying multiple large conduits, pipe racks, and equipment framing.

Order Eaton B-Line part number B12A-240HDG(MIG). That breaks down as the B12 channel profile, back-to-back welded, 240 in long, hot-dipped galvanized, MIG welded. Quote that full string so you don't get the pre-galvanized or plain-finish version by mistake.