FREE TOOL

Tap Drill & Thread Size Chart

Metric (M1.6–M24 coarse & fine) and Imperial (UNC/UNF #0–1") tap drill sizes. Adjust thread engagement percentage and see tap drill diameters in mm and inches. Export as CSV — no login required.

HOW IT WORKS

  1. Choose a thread system — Metric coarse/fine or Imperial UNC/UNF.
  2. Set thread engagement % — 50%, 65%, 75% (standard), or 100%.
  3. Search or scroll the table — click any row to highlight it and read off tap drill diameter in mm and inches.
  4. Export CSV to save the full table for your shop floor or engineering notebook.
← All free toolsEngineering Unit Converter →PDF Merger →
Tap Drill & Thread Size Chart
Metric and Imperial tap drill sizes with adjustable thread engagement percentage.
Thread Engagement
ThreadPitch (mm)Tap Drill @ 75% (mm)Tap Drill @ 75% (in)Clearance (mm)
M1.60.351.320.05181.80
M20.41.680.06602.40
M2.50.452.130.08402.90
M30.52.590.10213.40
M3.50.63.010.11863.90
M40.73.430.13514.50
M50.84.350.17135.50
M615.190.20436.60
M81.256.990.27509.00
M101.58.780.345811.00
M121.7510.580.416513.50
M14212.380.487315.50
M16214.380.566017.50
M182.515.970.628820.00
M202.517.970.707522.00
M222.519.970.786224.00
M24321.560.849026.00
Built with Coplain — try the AI documentation builderGet started free →

COPLAIN AI PLATFORM

Need AI-powered manufacturing documentation?

Coplain helps manufacturing teams create job aids, run compliance audits against ISO & AS9100, and translate technical documents — all with AI.

Start free →

Related Tools & Templates

ToolSpeeds & Feeds CalculatorToolDecimal to Fraction to MM ConverterToolHardness Conversion Chart (Rockwell, Vickers, Brinell)GuideGD&T Basics for Manufacturing EngineersToolCpk Process Capability CalculatorAI BuilderGenerate Custom Manufacturing Job Aids & SOPs