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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Oval heads are countersunk (cone shaped under the head) with a rounded top. Spanner (a.k.a. snake eyes) is a tamper resistant drive that requires a special driver to install.
The most common stainless steel for general hardware use.