B-Line Eaton series strut channel, .81" channel height, 240" channel length, 1.62" channel width, Aluminum, 14 Gauge, SH hole pattern, B54 channel typ

It's a half-height (shallow) channel. The B54 profile measures .81 inch high by 1.62 inch wide, so it's roughly half the depth of a standard 1-5/8 by 1-5/8 strut while keeping the same 1-5/8 inch nominal channel width. That matters two ways: standard 1-5/8 strut nuts, straps and fittings still seat in the open slot, but you get less bending strength than a full-height section, so use it for light hanger runs, conduit racks and trim-out work rather than long unsupported spans.

Aluminum is the corrosion answer. This B54 channel is 14 gauge aluminum, which won't rust in wet, coastal, wash-down or chemical areas where painted or even galvanized steel strut eventually bleeds. It's also far lighter to handle overhead: a full 240 inch stick weighs 18.2 lb. The tradeoff is load capacity, aluminum is less stiff than steel at the same gauge, so space your supports closer on heavier runs.

Yes. The open face of the B54 is 1.62 inches wide, the standard 1-5/8 inch strut opening, so conventional spring nuts, channel nuts, pipe straps and post bases made for 1-5/8 strut drop right in. What does not carry over is depth-dependent hardware: at .81 inch high this is a shallow section, so anything sized for a 1-5/8 inch deep channel, like deep-throat inserts or back-to-back splice hardware for full-height strut, won't seat correctly.

SH is the slotted-hole back pattern: the back of the channel comes punched with a repeating slot series so you can bolt the strut to structure or thread all-thread through it without drilling on site. If you want an unpunched solid back for a cleaner run or maximum section strength, you need a plain-back B54 instead. The punched back is the reason most electricians pick this version for overhead and wall-mounted conduit support.

Order Eaton B-Line part number B54SH-240AL. The number breaks down as B54 channel profile, SH slotted-hole back, 240 inch length, AL for aluminum, so if a drawing calls out a different suffix you're looking at a different material or punch pattern.