These screws transmit pressure where the screw touches the surface, eliminating the need for a separate washer. They also take up less space than a washer. They are more robust than stainless steel screws since they are made of alloy steel. In arid conditions, their black-oxide coating offers a moderate level of corrosion protection. The flange is included in head height. From beneath the flange, length is measured.

If you are unsure of the pitch or threads per inch, go with the industry standard coarse thread screws.