B-Line B22S58-120SS4 Eaton series strut channel, 1.62" channel height, 120" channel length, 1.62" channel width, Steel, 12 Gauge, S58 hole pattern, B22 channel type, Stainless steel type 304

It is stainless, type 304. The channel is steel in 12 gauge with a 304 stainless material finish, which is what you want for wash-down areas, coastal and exterior runs, water treatment, and food processing where painted or plain galvanized strut corrodes out.

S58 is B-Line's slotted back pattern, so the B22S58-120SS4 comes pre-slotted along the channel back rather than solid. That lets you bolt the run to structure anywhere along its length without field drilling. If you need an unpunched back for continuous welding or a clean look, S58 is the wrong pattern to order.

B22 is the deep 1-5/8 by 1-5/8 inch section, twice the depth of the shallow 13/16 inch back-to-back style. Use the deep section where you are spanning between supports or hanging heavier pipe and conduit; the shallow profile is for light single-conduit runs and short trapeze spans where depth would be wasted. This one is 12 gauge, the heavier of the common wall thicknesses.

Order it as Eaton B-Line B22S58-120SS4. Reading the number: B22 channel type, S58 slot pattern, 120 inch length, SS4 for type 304 stainless. Any of those four elements changing gives you a different stick, so match the whole string when you are standardizing a facility.

Yes, the 120 inch stick is meant to be field cut. Cut 304 stainless with an abrasive or carbide blade rated for stainless, then deburr and passivate or touch up the cut end, since a bare cut edge is the first place corrosion starts on an otherwise stainless run. Figure the 17.9 lb per full length into your handling and trapeze load math before you cut.