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Reference Tables -- NPT Tap Drill Sizes
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Standard NPT Tap Drill Sizes

NPT Size
 Tap Drill Size (in.)
Decimal Equivalent (in.)
1/16 - 27
"C"
0.242
1/8 - 27
"Q" 
0.332
1/4 - 18
7/16
0.438
3/8 - 18
9/16
0.562
1/2 - 14
45/64
0.703
3/4 - 14
29/32
0.906
1.0 - 111/2
19/64
1.141
11/4 - 111/2
131/64
1.484
11/2 - 111/2
123/32
1.719
2.0 - 111/2
23/16
2.188
21/2 - 8
239/64
2.609
3.0 - 8
315/64
3.234

 

 

 

 

 

 

 


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