Example: 1/2 – 20 Thread. 1/2 = Major diameter; 20 = Threads / Inch (TPI) Percentage of Thread and Tap Drill Selection: Many variables affect the performance of threaded holes and the taps used to generate them.. Most tap drill charts call out only one tap drill size, and that will produce an approximate 75 percent thread. In general, tap.. The PROPER tap drill for a 1/4″-20 thread is a #7, which is 0.201″ diameter. For a 1/4″-28 thread, use a #3 drill (0.213″ diameter). A 7/32″ drill is 0.219″ and will result in sloppy, weak threads on a 1/4″-20. A 13/64″ (0.203) drill would be a better choice if you only have fractional sizes available. 7/32″ is likely “close.

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Tap & Drill Chart: Screw/thread size, major and minor diameter, drill size, decimal equivalent. Tapped hole, close fit, and free fit clearance holes.. Drill Size Decimal Equivalent; 1/4-28: 0.25″ 0.2062″ 1: 0.228″ 1/4-32: 0.25″ 0.2117″ 1: 0.228″ 12-32: 0.216″ 0.1777″ 9: 0.196″ 12-28:. 3/4-20: 0.75″ 0.6887″ 23/32: 0.7188″ 13/16-20: 0.8125.. There are three most common threads per inch for a 1/4 tap, including 1/4-20, 1/4-28, and 1/4-32. Below are the recommended drill bit sizes for a 1/4 tap, depending on the type of material and threads per inch percentage you intend to drill. Standard Screw Size & Threads Per Inch. 75% Thread for Aluminum, Brass, & Plastics – Drill Bit Size.