The tap drill chart now covers every standard thread, with each drill shown in both inch and mm. New thread series UNEF (extra fine), #12-32 through 1-11/16-18 UN constant pitch (8-UN, 12-UN) and 1-14 UNS Metric fine threads: M8×1, M10×1.25, M12×1.5, M14×1.25 and more NPT / NPTF pipe threads, 1/16" to 4" BSPP (G) and BSPT (R) pipe threads STI helical insert drills, inch and metric Expanded sizes UNC now runs up to 4" UNF adds #12-28 and sizes up to 1-1/2" Metric coarse now covers M1 through M64 New features Cut Tap / Form (Roll) Tap switch with the correct drill for each Thread engagement % shown on every size The closest metric drill for inch threads, and the closest inch drill for metric threads Custom calculator with selectable thread engagement (50–85%) New Drill Sizes tab: every number, letter, fractional and metric drill with decimal and mm equivalents Smarter search: try “1/4 20”, “M6x1”, “NPT” or “G1/2”