B-Line B22KO6-240HDG Eaton series strut channel, 1.62" channel height, 240" channel length, 1.62" channel width, Steel, 12 Gauge, K06 Hole pattern, B22 channel type, Hot-dipped galvanized

B22 channel measures 1.62 inches high by 1.62 inches wide, which is the 1-5/8 inch square strut profile. Any strut nut, clamp, or fitting sized for 1-5/8 inch channel seats in the slot. Note that B22 is the back-to-back welded configuration in Eaton's B-Line numbering, so you get a closed square section rather than a single open-face channel.

Yes. The steel is hot-dipped galvanized, which is the heavier zinc coating used for exterior runs, rooftop supports, parking structures, and damp interior areas. Pre-galvanized (electro-plated) strut is the indoor-dry alternative. Cut ends expose bare steel, so field cuts on an outdoor run should be touched up with a cold galvanizing compound.

K06 is Eaton B-Line's designation for knockouts spaced on 6 inch centers along the channel back. That gives you a fixed hole every 6 inches for through-bolting to structure or running threaded rod, instead of having to field-drill. If your layout needs holes at other intervals, pick a different hole pattern or a solid-back channel and drill on site.

Order Eaton B-Line part number B22KO6-240HDG. The code reads out as B22 channel type, KO6 knockout pattern on 6 inch centers, 240 inch length, HDG for hot-dipped galvanized. Changing any one of those segments gets you a different stick, so quote the full number on the PO.