B-Line B12S-120HDG Eaton series strut channel, 2.43" channel height, 120" channel length, 1.62" channel width, Steel, 12 Gauge, S hole pattern, B12 channel type, Hot-dipped galvanized

The B12S strut channel comes hot-dipped galvanized, which is the finish you want outdoors, in parking structures, wastewater plants, rooftops, and other damp or corrosive areas. Plain painted or pre-galvanized strut is the indoor-only option. Hot-dip coating is applied after fabrication, so cut ends are the only exposed steel and should be touched up with a cold galvanizing compound after field cutting.

B12 channel measures 1.62 inches wide by 2.43 inches high, which is the deep 1-5/8 inch strut profile (roughly 1-5/8 by 2-7/16). The open face and bolt spacing match the common 1-5/8 inch strut system, so standard 1-5/8 strut nuts, straps, and fittings drop into it. What changes versus the shallow 1-5/8 by 13/16 channel is load capacity and span, not fitting compatibility.

S is the slotted back pattern: the channel back is punched with a repeating run of slots rather than left solid. That lets you through-bolt to structure, run threaded rod hangers, or field-locate an anchor anywhere along the length without drilling. If you want an unpunched back for maximum strength or a cleaner look, you need the solid back version of B12 instead.

It is steel, so yes, it cuts and welds. Two cautions: hot-dipped galvanized coating gives off zinc fumes when welded, so ventilate and follow your site welding procedure, and any cut or weld strips the coating, which then needs a cold galvanizing repair to keep the corrosion protection you bought the hot-dip finish for.

Order it as B-Line B12S-120HDG. Read that as B12 channel profile, S slotted hole pattern, 120 inch length, HDG hot-dipped galvanized. If your spec calls for a different length or a plain or pre-galvanized finish, the suffix changes but the B12S prefix stays.