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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Flat heads are countersunk (cone shaped under the head) with a flat top. Frearson drive is x-shaped, similar to (but not compatible with) phillips.
Solid bronze. An alloy of copper with greater strength and corrosion resistance than brass. Exact color varies.