B-Line Eaton series strut channel, 1.37" channel height, 120" channel length, 1.62" channel width, Steel, 12 Gauge, SH hole pattern, B32 channel type,

It's the shallow B32 profile: 1.62 inches wide by 1.37 inches high, so it's the reduced-height channel rather than the full 1-5/8 by 1-5/8 deep section. Width still matches standard 1-5/8 inch strut, so common strut nuts, straps and fittings sized to that width engage the lips normally. Where you need maximum span or load, the deeper full-height channel is the one to specify.

The B32SH-120GLV is pre-galvanized steel, which is meant for dry indoor and protected service. Pre-galv is coated before forming, so the cut ends and the punched slots are bare steel and will show rust in wet, humid or chemically aggressive conditions. For exterior runs, parking decks, pools or wash-down rooms, step up to hot-dip galvanized or stainless channel.

Yes, because the channel opening is the standard 1.62 inch width. Spring nuts, channel nuts, conduit straps and pipe clamps built for 1-5/8 inch strut drop into the lips the same way. What changes with the B32 is depth, not opening width, so deep-throat fittings that rely on the full 1-5/8 inch interior height won't seat in the 1.37 inch section.

SH is the slotted-hole back pattern, so the channel back is punched along its length instead of solid. That lets you bolt the strut straight through to studs, joists, deck or concrete anchors anywhere along the run without drilling on site, and it gives some adjustment to line up fixings. If you want an unpunched back for a cleaner look or to avoid dust and debris paths, order a solid-back B32 instead.

Twelve gauge is the standard heavy-duty strut thickness used for conduit racking, trapeze supports for pipe and duct, and equipment framing, as opposed to the lighter 14 and 16 gauge material sold for signage and light bracketry. Keep in mind this is the shallow 1.37 inch B32 section, so for long unsupported spans or heavy pipe loads the full-depth channel carries more.