Machinist Screw Thread Tap - Drill Size Table Chart ANSI Sizes

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Machinist Tap - Drill Size Chart ANSI Standard Pipe Thread
Machinist Metric ISO Screw Thread Tap - Drill Size Chart

ANSI Standard Vee-Thread Recommended Tap size and Drilled pilot Hole.

INCH SIZES - NATIONAL COARSE THREAD SERIES
TAP SIZE DRILL SIZE
#0-80 3/64"
#1-64 #53
#2-56 #51
#3-48 5/64"
#4-40 #43
#5-40 #39
#6-32 #36
#8-32 #29
#10-24 #25
#12-24 #17
1/4-20 #7
5/16-18 F
3/8-16 5/16
7/16-14 U
1/2-13 27/64
9/16-12 31/64
5/8-11 17/32
3/4-10 21/32
7/8-9 49/64
1"-8 7/8
1-1/8-7 63/64
1-1/4-7 1-7/64
1-1/2-6 1-11/32
1-3/4-5 1-35/64
2"-4-1/2 1-25/32

 

INCH SIZES - NATIONAL FINE THREADS
TAP SIZE DRILL SIZE
#1-72 #53
#2-64 #50
#3-56 #46
#4-48 #42
#5-44 #37
#6-40 #33
#8-36 #29
#10-32 #21
#12-28 #15
1/4-28 #3
5/16-24 I
3/8-24 Q
7/16-20 W
1/2-20 29/64
9/16-18 33/64
5/8-18 37/64
3/4-16 11/16
7/8-14 13/16
1"-12 15/16
1-1/8-12 1-3/64
1-1/4-12 1-11/64
1-1/2-12 1-27/64
1-3/4-12 1-43/64
2"-12 1-59/64

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