Self drilling screws have a drill bit point. Pan heads are slightly rounded with short vertical sides. Phillips drive is x-shaped for installation with a phillips screw driver.
A stainless alloy that is harder than 18-8 stainless steel, but not as resistant to corrosion.
Heat treated for adequate strength. Zinc plated for moderate corrosion resistance.
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A slotted hex washer head can be installed with either a wrench or a flat bladed screw driver, and has a built-in washer.
The most common stainless steel for general hardware use.