![]() Keep the information with you on a durable stainless steel engraved card. It also allows for the combining of inch and metric taps and drills where convenient to do so. Never be away from your wall mounted drill & tap chart. ![]() In both ISO and UN thread series, having a range of useful drill sizes allows designers and machinists to tailor effective thread depth for long holes, various materials and thread strength requirements. Metric tap drill charts have the same drill size problem in that they use the same formula as that employed for the obsolete AS threads. Metric threads of the International Standards Organization (ISO) have the same 60-degree thread form as UN threads, though the diameters and pitches are not interchangeable. For example a 100% thread specification is only 5% stronger than a 75% thread specification but requires 3 times the torque to produce. TAP DRILL RECOMMENDATIONS Tap Size Cutting Taps Forming Taps and Drill Decimal Drill Decimal Pitch Size Equiv. Lower percentages such as 75 of the thread depth. In our case, the correct tap drill would be the closest to 3.4 mm from below, and that is the 3.3 mm or 0.13-inch tap drill. Double sided 3' x 5' cards for quick conversion between Fractional Inches, Metric and Decimals as well as Tap Drill sizes. Style B charts provide a pipe tap drill chart as well as decimal equivalents of tap drill sizes, fractions, wire gauge drill sizes, letter drill sizes, and. Thread strength is not directly proportional to percent of thread. A rule of thumb is that the right tap drill is around 85 for coarse threads and 90 for fine threads which feature a higher number of threads per axial distance. Choose from our selection of drill charts, including reference books and charts, size identifying, and more. In general, tap tool life can be increased significantly by using a lower percent of thread and we suggest using values between 60% and 70% for most applications. Most tap drill charts call out only one tap drill size, and that will produce an approximate 75 percent thread. One very important factor is the drill size used to produce the hole that will be tapped. Many variables affect the performance of threaded holes and the taps used to generate them. ![]() Includes a tap drill calculator like no other. Our more advanced thread calculators are extra-cost modules. Just sign up for the 30-day trial and the basic Thread Calculator is yours forever. Percentage of Thread and Tap Drill Selection: G-Wizard’s built-in Thread Calculator is loaded with features and information, and it’s completely free.
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