B-Line MG122518FM 20 Eaton series Grate-Lock traction grip female to male interlock, 240" Grating length, 12" Grating width, Carbon steel, 2.5" Channel size, Mill-galvanized, Traction grip, Female/Male, 18 gauge

The MG122518FM is a female-to-male interlock panel, meaning one long edge is formed male and the other female. Lay panels in the same direction and each male edge drops into the next panel's female edge, so a 12 inch wide panel repeats across the span without separate splice hardware. Mixing orientation defeats the lock, so run all panels the same way.

The traction grip surface is made for safe, sturdy footing where non-slip is required, which is why it gets used on catwalks, platforms and mezzanine walkways. Finish is mill-galvanized carbon steel, suitable for the damp and industrial interiors typical of mechanical rooms. For fully exposed coastal or chemical exposure, a heavier coating is the better call.

It's 18 gauge carbon steel formed into a 2.5 inch deep channel section. Product height is listed at 2.5 inches, so your support framing, curb or opening has to allow that much depth below finished walking level if you want the grating flush. Support spacing is set by the structural design of the platform, not by the panel itself.

Mill-galvanized carbon steel is the as-formed zinc-coated finish, so panels go in bare in most industrial work. It can be painted, but galvanized steel needs an etching or self-etching primer first or topcoats won't hold. Cut ends made in the field expose bare steel and should be touched up with a zinc-rich coating.