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Drill Bit Chart

METRIC - GREEN FRACTIONAL - RED WIRE GAGE - PURPLE LETTER SIZE - BLUE
Nominal NPT & NPTF NPSM NPSC NPSF
Pipe Tap Size W/O Reamer W/Reamer      
1/16-27 C (.242) A (.234) -- .250 D (.246)
1/8-27 C (.332) 21/64 T (.358) Q (.332) R (.339)
1/4-18 7/16 27/64 15/32 7/16 7/16
3/8-18 9/16 9/16 .603* 37/64 37/64
1/2-14 45/64 11/16 19,0mm 45/64 45/64
3/4-14 29/32 57/64 61/64 59/64 59/64
1-11-1/2 1-9/64 1-1/8 1-13/64 1-5/32 1-5/32
1-1/4-11-1/2 1-31/64 1-15/32 1-35/64 1-1/2 --
1-1/2-11-1/2 1-23/32 1-45/64 1-25/32 1-47/64 --
2-11-1/2 2-3/16 2-11/64 2-14 2-13/64 --