B-Line B293-18SS4 Eaton series strut fittings and accessories, 3.5" Height, 18" Length, 1.62" Width, 3.4lbs, Steel, Number of mounting holes (1) 9/16 in diameter (vertical), Bracket, Uniform load capacity 400 lb, Stainless steel type 304

The B293-18SS4 carries a uniform load capacity of 400 lb. That is a uniform load across the bracket, not a point load at the free end, so if you are hanging a concentrated weight out at the tip, derate accordingly and spread the load over the channel where you can.

Yes. It is Type 304 stainless steel, which is the usual choice for exterior runs, damp mechanical rooms, food processing and washdown areas where painted or plain steel would rust out. For chloride-heavy environments like coastal exposure or pool chemistry, buyers typically step up to a 316 stainless fitting instead.

There is one mounting hole, 9/16 in diameter, oriented vertically. A 9/16 in hole is the standard strut hole size and takes a 1/2 in bolt or strut nut with clearance. Since there is a single hole at the mounting end, the bracket will pivot on that one fastener unless the channel leg is seated against the strut to resist rotation.

The B293-18SS4 measures 18 in length/depth, 3.5 in height and 1.62 in width. The 1.62 in width matches standard 1-5/8 in strut channel, so it lines up on a single-width run. Budget the full 18 in of clear projection off the face of your strut before ordering.

Yes. At 1.62 in wide it sits within the profile of standard 1-5/8 in strut, and the 9/16 in hole aligns with the channel slot so a strut nut engages normally. It mounts to the face of a vertical run of channel and cantilevers 18 in out from it.

Channel opening upward means the strut slot faces the sky once the bracket is mounted, so you drop strut nuts, clamps or pipe straps into the open face from above and slide them along to position. It is the orientation you want for supporting conduit, tray or pipe sitting on top of the arm. If you need to hang loads underneath from the slot, you want a bracket with the channel opening down instead.

Plan on it. The bracket itself is the 3.4 lb stainless arm with a single 9/16 in mounting hole; the bolt, strut nut and washer that fasten it to the channel, plus whatever clamps or straps hold your conduit or pipe, are separate line items. Match those fasteners to 304 stainless as well, otherwise you get galvanic corrosion at the joint and defeat the reason you bought a stainless bracket.

Order it as B-Line B293-18SS4. The B293 is the bracket series, 18 is the 18 in length, and the SS4 suffix is what tells you it is Type 304 stainless rather than plain or galvanized steel. If a submittal calls out a plain-steel B293, the SS4 is not a drop-in substitution on paper even though the geometry matches.