US TAP AND DRILL BIT SIZE TABLE

TapFractional Drill BitNumber Drill BitLetter Drill Bit
0-803/64
1-6453
2-5650
3-4847
4-403/3243
5-4038
6-327/6435
8-3229
10-245/3225
10-325/3221
12-2411/6416
1/4-2013/647
1/4-287/323
5/16-1817/64F
5/16-24I
3/8-165/16
3/8-2421/64Q
7/16-1423/64U
7/16-2025/64
1/2-1327/64
1/2-2029/64
9/16-1231/64
9/16-1833/64
5/8-1117/32
5/8-1837/64
3/4-1021/32
3/4-1611/16
7/8-949/64
7/8-1413/16
1-87/8
1-1259/64
1-1415/16