TAP-DRILL CHART. RECOMMEND TAP DRILL TO USE FOR 75% DEPTH OF THREAD. To Tap This Size Screw Or Bolt: Use This Drill Bit: (Closest Fractional:). Tap Size Cutting Taps. Forming Taps and. Drill. Decimal. Drill. Decimal. Pitch. Size. Equiv. Hole sizes shown may not suit UNJ and MJ hole requirements. Tap . Machine Screw Size, Threads Per Inch, Minor Dia, Tap Drills, Clearance Hole Drills. Alum, Brass, & Plasitcs. 75% Thread. Stainless Steel, Steels & Iron. This tap and clearance drill chart shows tap and clearance drill sizes for standard threads. There is also a printable version that has both metric and inch threads. Below is a comprehensive drill and tap size chart for all drills and taps, imperial and metric, up . A good tap drill is 85% (± 2 pp) of major diameter for coarse threads, and. A good tap drill is 90% (± 2 pp) of major diameter for fine threads. Imperial Tap Drill Chart. Machine Screw Size, Number of Threads Per Inch, Minor Dia. Tap Drills, Clearance Hole Drills. Aluminum, Brass & Plastics. Taps drill sizes , inch and metric , and tap drill calculator. . For other sizes that don't work out so nicely, just use the closest drill size. Back to Top of Page . Jump to How Can One Use the Drill Chart - Drill and tap charts rely on comparing the size of a . Drill charts work nicely with wood and metal components. EQUIVALENT. –. 0.10 .0039. –. 0.20 .0079. –. 0.25 .0098. –. 0.30 .0118. 80. 0.34 .0135. 79. 0.37 .0145. 1/64. 0.40 .0156. 78. 0.41 .0160. 77. 0.46 .0180. –. 0.50.