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GENERAL INFORMATION
1.14
SAE TAP DRILL SIZES
Thread Size/Drill Size Thread Size/Drill Size
#0-80 3/64
#1-64 53
#1-72 53
#2-56 51
#2-64 50
#3-48 5/64
#3-56 45
#4-40 43
#4-48 42
#5-40 38
#5-44 37
#6-32 36
#6-40 33
#8-32 29
#8-36 29
#10-24 24
#10-32 21
#12-24 17
#12-28 4.6mm
1/4-20 7
1/4-28 3
5/16-18 F
5/16-24 I
3/8-16 O
3/8-24 Q
7/16-14 U
7/16-20 25/64
1/2-13 27/64
1/2-20 29/64
9/16-12 31/64
9/16-18 33/64
5/8-11 17/32
5/8-18 37/64
3/4-10 21/32
3/4-16 11/16
7/8-9 49/64
7/8-14 13/16
1-8 7/8
1-12 59/64
1 1/8-7 63/64
1 1/8-12 1 3/64
11/4-7 17/64
1 1/4-12 1 11/64
11/2-6 111/32
1 1/2-12 1 27/64
13/4-5 19/16
1 3/4-12 1 43/64
2-4 1/2 1 25/32
2-12 1 59/64
2 1/4-4 1/2 2 1/32
21/2-4 21/4
23/4-4 21/2
3-4 2 3/4
METRIC TAP DRILL SIZES
Tap Size Drill Size Decimal
Equiva-
lent
Nearest
Fraction
3x.50
3x.60
4x.70
4x.75
5x.80
5x.90
6 x 1.00
7 x 1.00
8 x 1.00
8 x 1.25
9 x 1.00
9 x 1.25
10 x 1.25
10 x 1.50
11 x 1.50
12 x 1.50
12 x 1.75
#39
3/32
#30
1/8
#19
#20
#9
16/64
J
17/64
5/16
5/16
11/32
R
3/8
13/32
13/32
0.0995
0.0937
0.1285
0.125
0.166
0.161
0.196
0.234
0.277
0.265
0.3125
0.3125
0.3437
0.339
0.375
0.406
0.406
3/32
3/32
1/8
1/8
11/64
5/32
13/64
15/64
9/32
17/64
5/16
5/16
11/32
11/32
3/8
13/32
13/32
DECIMAL EQUIVALENTS
1/64 .0156................
1/32 .0312 1 mm = .0394″........... ...
3/64 .0469................
1/16 .0625...........
5/64 .0781 2 mm = .0787″................ ...
3/32 .0938...........
7/64 .1094 3 mm = .1181″.............. ...
1/8. .1250...
9/64 .1406................
5/32 .1563 4 mm = .1575″........... ...
11/64 .1719...............
3/16 .1875 5 mm = .1969″........... ...
13/64 .2031...............
7/32 .2188...........
15/64 .2344 6 mm = .2362″............... ...
1/4 .25....
17/64 .2656 7 mm = .2756″............... ...
9/32 .2813...........
19/64 .2969...............
5/16 .3125 8 mm = .3150″........... ...
21/64 .3281...............
11/32 .3438 9 mm = .3543″.......... ...
23/64 .3594...............
3/8 .375....
25/64 .3906 10 mm = .3937″............... ...
13/32 .4063.........
27/64 .4219 11 mm = .4331″............... ...
7/16 .4375...........
29/64 .4531...............
15/32 .4688 12 mm = .4724″......... ...
31/64 .4844...............
1/2 .5 13 mm = .5118.... ..............
33/64 .5156...............
17/32 .5313.........
35/64 .5469 14 mm = .5512″............... ...
9/16 .5625...........
37/64 .5781 15 mm = .5906″............... ...
19/32 .5938.........
39/64 .6094...............
5/8 .625 16 mm = .6299″.... ............
41/64 .6406...............
21/32 .6563 17 mm = .6693″......... ...
43/64 .6719
..............
11/16 .6875..........
45/64 .7031 18 mm = .7087″............... ...
23/32 .7188.........
47/64 .7344 19 mm = .7480″............... ...
3/4 .75....
49/64 .7656...............
25/32 .7813 20 mm = .7874″......... ...
51/64 .7969...............
13/16 .8125 21 mm = .8268″......... ...
53/64 .8281...............
27/32 .8438.........
55/64 .8594 22 mm = .8661″............... ...
7/8 .875....
57/64 .8906 23 mm = .9055″............... ...
29/32 .9063.........
59/64 .9219..............
15/16 .9375 24 mm = .9449″......... ...
61/64 .9531...............
31/32 .9688 25 mm = .9843......... ...
63/64 .9844...............
11.0.....