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Inch Tap Drill Sizes
Thread Size
and
Threads/inch
Nominal
Drill Size
Inch Drills
#0-80 3/64
#1x64 #53
#1x72 #53
#2x56 #51
#2x64 #50
#3x48 5/64
#3x56 #46
#4x40 #43
#4x48 #42
#5x40 #39
#5x44 #37
#6x32 #36
#6x40 #33
#8x32 #29
#8x36 #29
#10x24 #25
#10x32 #21
#12x24 #17
#12x28 #15
1/4x20 #7
1/4x28 #3
5/16x18 F
5/16x24 I
3/8x16 5/16
3/8x24 Q
7/16x14 U
7/16x20 W
Thread Size
and
Threads/inch
Nominal
Drill Size
Inch Drills
1/2x13 27/64
1/2x20 29/64
9/16x12 31/64
9/16x18 33/64
5/8x11 17/32
5/8x18 37/64
3/4x10 21/32
3/4x16 11/16
7/8x9 49/64
7/8x14 13/16
1x8 7/8
1x12 29/32
1-1/8x7 63/64
1-1/8x12 1-3/64
1-1/4x7 1-7/64
1-1/4x12 1-11/64
1-1/2x6 1-11/32
1-1/2x12 1-27/64
1-3/4x5 1-35/64
1-3/4x12 1-43/64
2x4-1/2 1-25/32
2x12 1-59/64
2-1/4x4-1/2 2-1/32
2-1/2x4 2-1/2
3x4 2-3/4
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