A nut with a built in oversize washer which is serrated to resist loosening. Meets IFI-145 (2002) / ASME B18.2.2 (2011).
A low carbon steel for general use. Zinc plated for moderate 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.