Zinc Plated Steel Self Drilling Screw, Pan Head, Phillips Drive, #8-18, 5/8" Length (Pack of 100) Features Create their own threads when driven into material Zinc Plated Steel fasteners are suitable where strength and corrosion resistance are... So I gathered a web store that sells Zinc Plated Steel Self Drilling Screw, Pan Head, Phillips Drive, #8-18, 5/8" Length (Pack of 100) and compare prices to. Some stores offers me fast shipping. Pan head fasteners have a low, large cylindrical head with a high rounded top edge for higher tightening torques - these fasteners are often recommended to replace older head styles such as round, binding, or truss-head where possible. Steels are designated by a 4 number SAE Steel grade.