A nut with a finished top that covers the end of the bolt. These nuts are fully threaded and accept more thread than standard cap nuts.
The most common stainless steel for general hardware use.
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Flat heads are countersunk (cone shaped under the head) with a flat top. Square drive is designed to reduce the risk of cam-out (stripping) and allow single-handed installation.
Heat treated for adequate strength. Zinc plated for moderate corrosion resistance.