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Pipe Tap Drill Sizes
Tapered Pipe
Thread Size
and
Threads/inch
Nominal
Drill Size
Inch Drills
1/8x27 R
1/4x18 7/16
3/8x18 37/64
1/2x14 23/32
3/4x14 59/64
1x11-1/2 1-5/32
1-1/4x11-1/2 1-1/2
1-1/2x11-1/2 1-47/64
2x11-1/2 2-7/32
2-1/2x8 2-5/8
3x8 3-1/4
3-1/2x8 3-3/4
4x8 4-1/4
4-1/2x8 4-3/4
5x8 5-9/32
6x8 6-11/32
Straight Pipe
Thread Size
and
Threads/inch
Nominal
Drill Size
Inch Drills
1/8x27 S
1/4x18 29/64
3/8x18 19/32
1/2x14 47/64
3/4x14 15/16
1x11-1/2 1-3/16
1-1/4x11-1/2 1-33/64
1-1/2x11-1/2 1-3/4
2x11-1/2 2-7/32
2-1/2x8 2-21/32
3x8 3-9/32
3-1/2x8 3-25/32
4x8 4-9/32
4-1/2x8 4-25/32
5x8 5-11/32
6x8 6-13/32
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