Timber bolts have an oversized head to eliminate the need for a washer, and fins to resist spinning during installation.
A low carbon steel for general use. Hot dipped galvanized (A153) for very good 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.
Heat treated for adequate strength. Zinc plated for moderate corrosion resistance.