Flat Head machine screws have a 90 degree angle underneath the head. This head style recesses into a countersunk hole to sit flush with the work surface.
Unlike other machine screws style such as pan or cheese head, flat head screws are measured by overall length including the head.
A4 / 316 Stainless Steel fasteners are “marine grade” corrosion resistant; suitable for salt water applications. A4 fasteners also offer increased resistance to chemicals when compared with A2 stainless fasteners.
