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NPT Tap Drill Chart

National Pipe Tapered Tap (NPT) Chart 

Tap Size Drill Size  Tap and Drill Set
 1/8" NPT Tap  "R" Drill Bit  1/8" NPT Tap and Drill Set
 1/4" NPT Tap  7/16" Drill Bit 1/4" NPT Tap and Drill Set
 3/8" NPT Tap  37/64" Drill Bit 3/8" NPT Tap and Drill Set
 1/2" NPT Tap  23/32" Drill Bit 1/2" NPT Tap and Drill Set
 3/4" NPT Tap  59/64" Drill Bit 3/4" NPT Tap and Drill Set
 1" NPT Tap  1-5/32" Drill Bit 1" NPT Tap and Drill Set
 1-1/2" NPT Tap  1-1/2" Drill Bit Only Sold Individually
 1-3/4" NPT Tap  1-47/64" Drill Bit Only Sold Individually
 2" NPT Tap  2-7/32" Drill Bit Only Sold Individually
 2-1/2" NPT Tap  2-5/8" Drill Bit Only Sold Individually
 3" NPT Tap  3-1/4" Drill Bit Only Sold Individually
 3-1/2" NPT Tap  3-3/4 Drill Bit Only Sold Individually
 4" NPT Tap  4-1/4 Drill Bit Only Sold Individually