February 2026 Tip: Basic Thread Dimensions and Tap Drill Sizes

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Today, I'm happy to share a new Machinist Tip with you - a three-page PDF of Basic Thread Dimensions and Tap Drill Sizes. The PDF provides information for American National Coarse Threads - formerly A.S.M.E. Regular for sizes 1-12; U.S. Standard for sizes 1/4 inch and larger.

Clearly marked D for Major Diameter, E for Pitch Diameter, and K for Minor Diameter. Column headers are as follows:

  • Size of Thread and Threads per Inch
  • Major Diameter D Inches
  • Pitch Diameter E Inches
  • Minor Diameter Internal Threads K Inches
  • Commercial Tap Drill to Produce Approx. 75% Full Thread
  • Decimal Equivalent of Tap Drill Inches
Basic Thread Dimensions and Tap Drill Sizes
Sample of Basic Thread Dimensions and Tap Drill Sizes

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