B-Line B54SHA-120HDG Eaton series strut back-to-back welded channel, .81" channel height, 120" channel length, 1.62" channel width, Steel, 14 Gauge, SHA hole pattern, B54 channel type, Hot-dipped galvanized

The B54SHA-120HDG is hot-dipped galvanized steel, which is the finish B-Line uses for exterior, rooftop, and damp or corrosive indoor runs. Plain electro-galvanized (pre-galvanized) strut is the indoor-only finish; hot-dip puts a heavier zinc coat over the channel after fabrication, including the welded seam and the punched holes.

B54 is a shallow profile: 1.62 inches wide (the nominal 1-5/8 inch strut opening) by .81 inches high, which is the half-height version of the standard 1-5/8 x 1-5/8 channel. Because the opening and the inturned lips are full 1-5/8 inch size, standard 1-5/8 strut nuts, clamps, and fittings seat in it the same way they do in full-height channel. What changes is load capacity and the depth you need behind the run, not the hardware.

Back-to-back means two B54 channels welded spine to spine so the openings face opposite directions, giving you a stiffer member with a mounting slot on both faces. Contractors use it for trapeze hanger uprights, freestanding support frames, and longer spans where a single channel would deflect. If you only need to mount to one side and the run is short, a single channel is lighter and cheaper to handle.

SHA is B-Line's designation for the slotted hole pattern punched in the channel back, so the B54SHA-120HDG arrives pre-punched rather than solid. That lets you bolt the strut to structure or splice sections without field drilling, which matters here because drilling a hot-dip galvanized channel breaks the zinc at the hole. If you want a solid back for a cleaner look or full section strength, you want a plain (un-punched) B54 instead.

Order it as B-Line B54SHA-120HDG. The number breaks down as B54 channel type, SHA hole pattern, 120 inch length, HDG for hot-dipped galvanized, so if you need a different length or a plain finish you are changing the suffixes on that same B54SHA base.

Yes, B54 back-to-back channel cuts with a bandsaw, chop saw with a metal blade, or portable band saw. Since it is hot-dipped galvanized, brush the burr off and hit the cut end with a cold galvanizing compound so you do not leave bare steel exposed on an outdoor run. Cutting through the welded back of a back-to-back section is slower than a single channel because you are cutting two thicknesses of 14 gauge steel.