Tap Drill Calculated (Unified)


Basic Major Diameter (for example: .25)
Decimal inches

Threads per Inch (for example: 20)

Percent of Full Thread:
Percent (Enter 75 for 75%)

Hole Diameter (See chart for nearest standard size)
Hole Size = Basic major diameter – (1.08253 X % Full thread / Threads per inch)


Leave a Reply

Your email address will not be published. Required fields are marked *

Scroll to Top