B-Line B409-18SS4 Eaton series strut fittings and accessories, 4.62" Height, 18" Length, 1.62" Width, 3.47lbs, Steel, Single channel bracket, Uniform load capacity 640 lbs, Stainless steel type 304

The B409-18SS4 single channel bracket is rated for a uniform load capacity of 640 lbs. That is a uniform load figure, so a concentrated point load at the free end of the 18 inch arm will not support the same value. Size your supports off the uniform rating and spread the load along the channel where you can.

It is Type 304 stainless steel, which is the grade normally specified for wet, food-processing and outdoor mounting where plain or electro-galvanized strut fittings would rust. For chloride-heavy service such as coastal exposure or pool chemical rooms, Type 316 is the usual step up.

It measures 18 inches in length, 4.62 inches in height and 1.62 inches in width, and weighs 3.47 lbs. The 1.62 inch width is the giveaway that it is a single channel profile rather than a double, so plan on one row of bolt holes and one line of attachment back to the strut.

No. The B409-18SS4 ships as the bracket only, so the strut nuts, bolts and washers are a separate line on the order. If you are buying it for the 304 stainless corrosion resistance, buy stainless hardware to match, otherwise plated steel fasteners will be the first thing to corrode and they can seize against the stainless.

That is exactly what a single channel bracket of this size is for. The 18 inch arm gives you an 18 inch reach off the strut face, and with 640 lbs uniform capacity it will carry conduit racks, small tray runs, pipe clamps or equipment shelving. Mount it to the channel with strut nuts through the bracket slots and support long tray runs with brackets at regular intervals rather than relying on one.

Order it as B-Line B409-18SS4. The B409 is the single channel bracket series, the 18 is the 18 inch length, and the SS4 suffix denotes the Type 304 stainless material. Drop the SS4 and you are ordering a different material, so keep the full suffix on the purchase order if corrosion resistance is the reason you picked it.

No listing or agency certification is carried on the B409-18SS4 bracket, and none is normally required for a strut support fitting. Specify it on load and material: 640 lbs uniform capacity, 304 stainless. Where a job spec calls for certified seismic bracing, that approval sits with the engineered bracing system, not with an individual channel bracket.