Machinist Tap Drill Chart

By Signet LLC on AppTrack Ninja.

Thread, screw & hole sizes

The chart on the shop wall says 1/4-20 takes a #7. It does not say what thread you actually end up with. This one does. Pick a thread and it names a drill you can pick up out of the index — then shows the diameter the formula asked for, the difference, and the percent of thread that drill really cuts. You asked for 75%. The #7 gives you 75.4%. Both numbers are on the screen, because the second one is the one in your part. WHAT IS IN IT, FREE - Cutting taps: UNC, UNF, metric coarse and metric fine - Forming and roll taps, on the forming constant rather than the cutting one - NPT pipe threads -…

Categories: Utilities, Productivity

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