B-Line Eaton series strut channel, 1.37" channel height, 240" channel length, 1.62" channel width, Steel, 12 Gauge, S hole pattern, B32 channel type,

Pre-galvanized is the standard indoor and protected finish. It handles normal mechanical room, warehouse, and concealed-ceiling conditions fine, and it is what most interior electrical and mechanical support runs use. For direct weather exposure, wash-down areas, or corrosive environments, specify hot-dip galvanized or stainless strut instead. Note that cut ends on pre-galvanized channel are raw steel and should be cold galvanized after cutting.

Yes. The channel opening is the standard 1-5/8 inch strut width, so 1-5/8 inch spring nuts, channel nuts, pipe clamps, post bases, and angle fittings engage the returned lips normally. What changes with B32 is depth, not the opening: at 1.37 inches high it accepts the same nuts but has less interior room than a 1-5/8 by 1-5/8 channel, so deep or stacked hardware inside the channel can be tight.

S is the slotted back pattern, so the B32 channel comes punched along its back rather than solid. That lets you bolt the strut directly to studs, joists, or concrete anywhere along the run without field drilling, and gives adjustment for threaded rod and beam clamps. If you want a solid back for a cleaner look or maximum uncut section, that is a different suffix, not this one.

Order Eaton B-Line part number B32S-240GLV. Reading the code: B32 is the channel profile, S is the slotted hole pattern, 240 is the length in inches, and GLV is the pre-galvanized finish. Quoting the full designation matters because the same B32 profile is sold in other lengths, hole patterns, and finishes.