The drill size shown by the calculator is the diameter
of the standard drill which is the
closest to the minimum minor diameters of the pipe thread.
When nonferrous metals are to be drilled and tapped, it may be needed to use a drill
with larger or smaller
diameter to have a hole which is appropriate for an acceptable pipe thread
with the required thread height.
NPT tap calculator is intended to help only the occasional user of drills.
NPT Tap Drill Chart and Calculator::
Notes: If the use of reamer selection is "yes" for taper pipe thread, then ream
the hole before tapping with a reamer having a taper of 3/4 inch per foot.
RESULTS |
Value |
Parameter |
Nominal Pipe Size |
---
|
--- |
Outer Diameter of Pipe |
---
|
inch |
Recommended Inch Drill Size |
---
|
--- |
Drill Size Decimal Equivalent |
---
|
inch |