These screws are used to screw light guage steel, galvanized or aluminum roofing panels (24ga - 18ga) to a structural purlin. They are made from case hardened steel. They are a #12 screw, 1 1/4" long, (appx 1" of thread) have a self sealing washer, have a self drilling point and use a 3/8" standard screw bit.
Lot of (1200) slotted / indented hex washer head self-threading sheet metal screws. These zinc plated screws are size #8 and are 1" in length with a 1/4" hex. The type A screw is designed for use in sheet metal from .015 to .050" thick with pre-drilled or punched holes as well as some plastics, impregnated plywood, and other materials.
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