Tap & Drill: Tap Drill Chart
By Atanas Dimitrov on AppTrack Ninja.
Thread Sizes for Machinists
The tap drill chart machinists actually reach for, in your pocket. Pick a thread and the right drill appears at a size you can read from across the bench, with its decimal size and thread percentage. ONE TAP, THE RIGHT DRILL • 1/4-20 is a #7. M8 x 1.25 is 6.8 mm. Every common thread, answered instantly. • Number, letter, fractional and metric drills checked together, closest first. • Next size up and down, each with its thread percentage. THE WHOLE CHART • UNC and UNF from #0 to 1 inch, ISO metric coarse and fine from M1.6 to M30. • Search, quick picks or browse the full chart like the one on…
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