Self-Tapping | Sheeting Screws ... TFC LAUNCHES 304 STAINLESS STEEL BI METAL PANCAKE HEAD SCREW. Triangle Fastener Corporation is pleased to announce the #14 DP1 ... The most common sheet metal screws are a Type A with coarse spaced threads and a sharp gimlet point, mostly seen used in stainlesss steel screws; the Type AB which has more narrow thread spacing and a gimlet point; and the Type B which has a blunt point and threads spaced like an AB.