Table 1 shows the various types of “self-tapping” screw threads covered by the ANSI B18.6.4- 1981 (R1991) standard. (Metric thread forming and thread cutting tapping screws are discussed beginning on page 1766). ANSI designations are also shown. Types A, AB, B, BP and C when turned into a hole of proper size form a thread by a displacing.. Screws for Hardwood. Also known as Type 17 auger point screws, these penetrate hardwood and reduce driving torque. They require a pilot hole to prevent splitting when used near an edge. Choose from our selection of self-cutting screws, including over 750 products in a wide range of styles and sizes. In stock and ready to ship.
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