B-Line B494-18SS4 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 up, Stainless steel type 304

The B494-18SS4 braced single bracket is rated for 1,700 lbs. That rating is for the bracket as a braced assembly, so the diagonal brace has to be installed with the correct channel piece for the number to hold. On the B494-24 and smaller sizes the bottom brace is B42 channel; on B494 and up it is B22.

Yes. It's Type 304 stainless steel, which is the grade normally specified for outdoor, washdown, and general corrosive-atmosphere work. The SS4 suffix on the part number is what designates the 304 stainless version, so if you're matching an existing corrosion-resistant run, that suffix is the thing to keep consistent across your fittings.

The B494-18SS4 is the bracket itself, 5.09 lbs of 304 stainless. Plan your order to include the B42 brace channel piece plus the strut nuts and bolts needed to fasten the bracket and brace to the vertical channel, and whatever anchors suit the wall you're fixing to. For a stainless installation, keep the fasteners stainless too, so you aren't putting plated steel hardware into a 304 assembly.

Arm length is 18 inches, height is 8.75 inches, and width is 1.62 inches. Weight is 5.09 lbs each, which matters when you're totaling dead load on a wall or hanging a long run of them. The 1.62 inch width is standard 1-5/8 strut width, so it lines up with the strut profile it mounts to.

A braced single bracket carries far more at the tip than an unbraced one because the diagonal transfers load back into the wall channel instead of relying on the bolted joint alone. Use the B494 style where you're cantilevering conduit racks, cable tray, or pipe out 18 inches and want the 1,700 lb rating. A plain unbraced bracket is fine for light single-conduit runs and short projections, and it's quicker to install since there's no brace channel to cut and bolt.

If the existing brackets are B494 series at 18 inches, this is the same part in the 304 stainless finish. What to check on your rack: the projection you need (18 inches here) and whether the run was built with B42 or B22 brace channel. B42 is correct for the 18 inch and other B494-24 and smaller sizes. Mixing a bracket sized for one brace channel with the other won't line up properly.