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Search the published shop chart and select a thread to get its 75% tap drill and decimal equivalent instantly.
Use a 5/16-inch drill (0.3125 inch) for approximately 75% thread engagement.
Use a #7 drill, with a 0.2010-inch decimal diameter.
For common metric coarse threads, subtracting pitch from major diameter closely matches a 75% chart size. For example, M6 × 1.0 uses a 5.0 mm drill.
No. NPT is tapered and uses dedicated pipe-tap drill sizes, so select the chart entry rather than applying the UNC or metric formula.
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