These bolts have a flange under the head to distribute the load.
A low carbon steel for general use. Hot dipped galvanized (A153) for very good corrosion resistance.
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Oval heads are countersunk (cone shaped under the head) with a rounded top. Phillips drive is x-shaped for installation with a phillips screw driver.
The most common stainless steel for general hardware use.
A highly corrosion resistant grade of stainless steel. Ideal in salt water and chlorine environments. More expensive than 18-8.