![]() It also allows for the combining of inch and metric taps and drills where convenient to do so. 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. ![]() If you want a drill bit for a ¼ 20 tap, where ¼ is the diameter and 20 stands for the thread pitch, then the overall measurement of the tap’s diameter is 0.252 inches. 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. First, you need to measure the overall diameter of the tap. For example a 100% thread specification is only 5% stronger than a 75% thread specification but requires 3 times the torque to produce. 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. Pipe Tap Size Pitch (TPI) Drill Size (inch) Pitch (TPI) Drill Size (inch) 1/16 27 0.242 (C) - 1/8 27 0.332 (Q) 27 0. This chart includes various materials and applications, offering a quick reference for your threading needs.Percentage of Thread and Tap Drill Selection: TAP-DRILL CHART – RECOMMEND TAP DRILL TO USE FOR 75% DEPTH OF THREADįor your convenience, we’ve compiled a comprehensive tap drill size chart for 5/16-18 taps. Drill Size Drill Size Drill Size Pitch in mm Pitch Pitch in mm in mm. What size hole do I drill for a 5 16 threaded insert?ģ3/64 inches hole suitable for 5/16″ Tap. METRIC COARSE / METRIC FINE - 60° included angle (Fluteless) Metric Fine Metric Coarse Metric Fine Size Size.
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