METAL PLATE

Heavy metal plate is steel (or other metal) stock at the thick end of the plate range, generally starting around one inch and running up to several inches thick. It’s the material fabricators reach for when a job calls for mass, rigidity, and the ability to carry serious structural or impact loads, not just cover a surface. Metal stock is generally grouped by thickness:

• Sheet metal — under 3/16 inch. Easy to bend, form, and work with light-gauge tooling.
• Standard plate — roughly 3/16 inch up to about 1 inch. Used for tanks, enclosures, and general fabrication.
• Heavy plate — roughly 1 inch and thicker, sometimes running to 6 inches or more. Used where the metal itself needs to do structural work: bearing weight, resisting wear, or holding its shape under repeated stress.

The thicker the plate, the more it behaves like a structural element in its own right rather than just a surface or cladding material — which is why heavy plate shows up in machine bases, structural connections, and heavy equipment rather than in ductwork or cabinetry.