B-Line B494-18ZN Eaton series strut fittings and accessories, 8.75" Height, 18" L, 1.62" W, 5.09lbs, Steel, Braced single bracket, Load capacity 1700 lbs, Bottom brace: B42 on B494-24 and smaller and B22 on B494 and larger, Electro-plated zinc

The B494-18ZN braced single bracket is rated for a 1700 lb load capacity. That rating is for the bracket itself, so the strut it mounts to, the channel nuts, and the anchors into the structure all have to be rated for the same load or more, otherwise the weakest of those governs the assembly.

At 18 inches the B494-18ZN falls in the B494-24 and smaller range, so the bottom brace is B42 channel. The longer brackets, B494 and larger, use B22 for the brace instead. Worth knowing if you are stocking spare brace pieces or matching an existing run.

The B494-18ZN is steel with an electro-plated zinc finish, which is a dry indoor finish. It suits mechanical rooms, electrical rooms, and covered interior spaces. For exterior walls, parking structures, wash-down areas, or corrosive process environments, specify a hot dip galvanized or stainless version of the bracket instead.

It measures 18 inches long, 8.75 inches high, and 1.62 inches wide. The 18 inch dimension is the arm length, so plan for roughly a foot and a half of clear space off the face of the mounting channel before you order. It weighs 5.09 lb, light enough for one person to hold up while starting the channel nuts.

A braced bracket like the B494-18ZN carries a diagonal or bottom brace back to the wall channel, which turns the cantilever load into compression rather than pure bending on the arm. That is what gets it to 1700 lbs. Unbraced single brackets are fine for light conduit runs and small boxes; once you are hanging cable tray, heavy conduit banks, or equipment out 18 inches from the wall, the braced version is the one to use.

The bracket arm is what you get. You still need the vertical strut channel it mounts to, channel nuts and bolts to fasten both the arm and the bottom brace, and the anchors or fasteners into the wall or structure. The brace channel type for this length is B42.

Order as B494-18ZN. It is the Eaton B-Line strut fittings and accessories line; the 18 in the number is the 18 inch arm length and the ZN suffix is the electro-plated zinc finish. Longer and shorter arms run under the same B494 base number with a different length suffix.