B-Line Eaton series Grip Strut stair tread, 288" Grating length, 4.75" Grating width, Steel, 1.5" Channel size, Mill-galvanized, Stair tread, 14 gauge

The Grip Strut tread, model T21514 24 GL, gives a 4.75 inch grating width with a 1.5 inch channel depth. That is a single-plank tread width, so on deeper stairs crews typically run two planks side by side per step. Height off the stringer or support angle is 1.5 inches, which is what you need to account for when setting your riser dimensions.

Yes. The B-Line Grip Strut stair tread is listed as OSHA compliant, and the diamond-pierced surface is the reason: it provides slip resistance in all directions where non-slip footing is required, including on oily or wet steel stairs. Note that OSHA compliance of the finished stair also depends on how you set rise, run and railings, not on the tread alone.

It ships as one 288 inch length of 14 gauge steel plank, which is 24 feet. Fabricators routinely cut it to tread length on site, but be aware the cut ends and any drilled holes break through the mill-galvanized coating, so those edges need field touch-up with a zinc-rich paint if the stair sees weather or wash-down.

Mill-galvanized steel is the pre-galvanized coating applied to the coil before forming. It handles covered exterior and general industrial use, but in coastal air, chemical exposure, or constant wetting a hot-dip galvanized or stainless plank is the better call. For dry interior mezzanines and plant stairs, mill-galvanized is the normal specification.

Channel depth drives the span. At 1.5 inches, this plank suits the short spans of a stair tread between two stringers. Where you are decking a walkway or platform with supports farther apart, a deeper channel plank carries the load over the longer span. Pick the depth from your support spacing, not from the walking width.

Listed product weight is 2.3 lb. It is a light-gauge formed steel plank, so one person can carry a length, though a 24 foot piece is awkward to handle alone and is best moved by two.