2 Tap Drilling Sizes

Drilled Hole Size

 

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BSW 
Screw Threads
BSF
Screw Threads
G (BSP)
Screw Threads
Rc (BSPT)
Screw Threads
Thread Size Drill Dia. MM Thread Size Drill Dia. MM Thread Size Drill Dia. MM Thread Size Drill Dia. MM
1/16X60 1.16 3/16X32 3.97 G1/16X28 6.8 Rc1/16X28 6.2
3/32X48 1.65 7/32X28 4.65 1/8X28 8.8 1/8X28 8.2
1/8X40 2.54 1/4X26 5.37 1/4X19 11.8 1/4X19 10.9
5/32X32 3.18 9/32X26 6.2 3/8X19 15.3 3/8X19 14.4
3/16X24 3.7 5/16X22 6.8 1/2X14 19.1 1/2X14 18
7/32X24 4.5 3/8X20 8.3 5/8X14 21.1 3/4X14 23
1/4X20 5.08 7/16X18 9.7 3/4X14 24.6 1”X11 29
9/32X20 5.87 1/2X16 11.1 7/8X14 28.4 1.1/4X11 38
5/16X18 6.5 9/16X16 12.7 1”X11 30.9 1.1/2X11 44
3/8X16 7.9 5/8X14 14.1 1.1/8X11 35.6 2”X11 55
7/16X14 9.3 11/16X14 15.6 1.1/4X11 39.6 2.1/2X11 71
1/2X12 10.6 3/4X12 16.9 1.3/8X11 42 3”X11 83
9/16X12 12.2 13/16X12 18.5 1.1/2X11 45.5
5/8X11 13.6 7/8X11 19.9 1.3/4X11 51.4
3/4X10 16.5 1”X10 22.9 2”X11 57.3
13/16X10 18.1 1.1/8X9 25.8 2.1/4X11 63.4
7/8X9 19.4 1.1/4X9 28.9 2.1/2X11 72.9
15/16X9 21 1.3/8X8 31.8 2.3/4X11 79.2
1”X8 22.2 1.1/2X8 34.9 3”X11 85.6
1.1/8X7 24.9 1.5/8X8 38.1
1.1/4X7 28.1 1.3/4X7 40.8
1.3/8X6 30.7 1.7/8X7 44
1.1/2X6 33.9 2”X7 47.2
1.5/8X5 36.2
1.3/4X5 39.4
1.7/8X4.1/2 42
2”X4.1/2 45.2
2.1/4X4 50.8
2.1/2X4 57.2
2.3/4X3.1/2 62.6
3”X3.1/2 68.9

American Pipe Threads American Dryseal Pipe Threads
NPT
Screw Threads
NPS
Screw Threads
NPTF
Screw Threads
NPSF
Screw Threads
Thread Size Drill Dia. MM Thread Size Drill Dia. MM Thread Size Drill Dia. MM Thread Size Drill Dia. MM
1/16X27 6.3 1/16X27 6.7 1/16X27 6.3 1/16X27 6.3
1/8X27 8.6 1/8X27 9.1 1/8X27 8.4 1/8X27 8.7
1/4X18 11 1/4X18 12.1 1/4X18 10.9 1/4X18 11.3
3/8X18 14.5 3/8X18 15.4 3/8X18 14.25 3/8X18 14.7
1/2X14 18 1/2X14 19.1 1/2X14 17.75 1/2X14 18.1
3/4X14 23 3/4X14 24.5 3/4X14 23 3/4X14 23.5
1”X11.1/2 29 1”X11.1/2 30.6 1”X11.1/2 29 1”X11.1/2 29.5
1.1/4X11.1/2 38 1.1/4X11.1/2 39.4 1.1/4X11.1/2 37.8
1.1/2X11.1/2 44 1.1/2X11.1/2 45.4 1.1/2X11.1/2 43.8
2”X11.1/2 56 2”X11.1/2 57.5 2”X11.1/2 55.8

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