About this app
Standing at the mill and can't remember the right drill size for an M8x1.25 tap? This app gives you the answer faster than flipping through a chart book. Select thread type (UNC, UNF, Metric), pick your size, and instantly see the recommended tap drill, clearance drill, thread percentage, and decimal equivalent. No searching, no guessing. TAP DRILL CALCULATOR: Select thread standard and size to get tap drill size, clearance drill, and thread percentage. Covers M3 to M24 metric, #0 to 1 inch imperial. DRILL CHART: Full reference table with tap drill, clearance drill, and thread percentage for every common size. One-tap lookup. THREAD SPECIFICATIONS: Detailed data for each size: pitch, threads per inch (TPI), major diameter, minor diameter, and pitch diameter for UNC, UNF, and ISO Metric standards. FAVORITES: Save your most-used tap and drill combinations for instant access on repeat jobs. Works completely offline. No account required. Built for machinists, CNC operators, and fabrication shops who need fast, accurate thread data at the machine.
Latest release
What’s New
Added a More Pro Tools section to discover related field calculators.
Audience growth
Ratings growth
Baseline captured. Growth appears after the crawler observes a changed rating count.
Momentum comes from crawler snapshots for the tracked storefront. “Viral growth signal” means unusually fast recent rating gains; it is an indicator, not download data.
Price tracking
Price intelligence
First snapshot captured. The trend line starts after the next crawler price observation.
- First observed Oct 2, 2026 · 7:51 PM $0.99
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