A nut with a built in washer and a nylon insert to prevent loosening. Meets IFI-100/107 (2002)
Grade F nuts are used with Grade 5 fasteners. 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.