B-Line B178SHLZN Eaton series strut fittings and accessories, 3.43" Height, 12" Length, 1.62" Width, 1.43lbs, Steel, Left bracing slotted bracket, Thickness 1/4 in, Electro-plated

It's a left bracing slotted bracket for strut channel systems, used to run a diagonal brace off a strut run to stiffen a trapeze, rack, or support frame. The slotted leg lets you adjust the brace angle and position before tightening rather than locking you to fixed hole centers. Being the left-hand version, it braces in one direction only, so mirrored bracing on the opposite side of a run needs the right-hand counterpart.

Six holes total: one 7/16 inch diameter round hole, plus four slots measuring 1 inch long by 13/32 inch. The 7/16 inch hole and the 13/32 inch slot width both take standard 3/8 inch strut hardware, so it bolts up with the same channel nuts and bolts already on the run. The slots are what let you set the brace angle instead of matching fixed hole spacing.

Two of the same part won't mirror. The B178SHLZN is the left bracing bracket, so if you're bracing both directions on a run, or bracing symmetric legs of a trapeze, order the matching right-hand bracket for the opposite side. Ordering a pair of lefts is the most common mistake on this part.

1/4 inch steel, which is heavy-gauge for a strut fitting rather than a light formed sheet bracket. At 12 inches long and 1.62 inches wide it weighs 1.43 lb, so it is substantial enough for bracing loaded trapeze and pipe-support runs, not just conduit tack-ups.

The finish is electro-plated zinc, which is an indoor, dry-location coating. It resists handling corrosion and normal interior humidity fine, but for exterior, wash-down, or corrosive environments you want a hot-dip galvanized or stainless strut fitting instead. Don't specify this one on a rooftop or in a chemical area.

No. The bracket ships as the bracket alone, so you supply the channel nuts, bolts, and washers to fasten it to the strut. Size that hardware to the 7/16 inch round hole and 13/32 inch slot width, which is standard 3/8 inch strut hardware.

Same thing. B-Line is Eaton's strut and support line, and B178SHLZN is the Eaton B-Line catalog number for the left bracing slotted bracket. If a drawing or a submittal calls out B178SHLZN, this is the part, no cross-reference needed.