1.11
GENERAL INFORMATION
1
SAE Tap Drill Sizes
Metric Tap Drill Sizes
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 . . 5mm= .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 . . 8mm= .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 . . . . . . . . . . . 13mm = .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 . . . . . . . . . 16mm=. 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
1. . . . . . . . . . 1.0
Thread Size/ Drill Size Thread Size / Drill Size
#0-80 3/64 1/2-13 27/64
#1-64 53 1/2-20 29/64
#1-72 53 9/16-12 31/64
#2-56 51 9/16-18 33/64
#2-64 50 5/8-11 17/32
#3-48 5/64 5/8-18 37/64
#3-56 45 3/4-10 21/32
#4-40 43 3/4-16 11/16
#4-48 42 7/8-9 49/64
#5-40 38 7/8-14 13/16
#5-44 37 1-8 7/8
#6-32 36 1-12 59/64
#6-40 33 1 1/8-7 63/64
#8-32 29 1 1/8-12 1 3/64
#8-36 29 1 1/4-7 1 7/64
#10-24 24 1 1/4-12 1 11/64
#10-32 21 1 1/2-6 1 11/32
#12-24 17 1 1/2-12 1 27/64
#12-28 4.6mm 1 3/4-5 1 9/16
1/4-20 7 1 3/4-12 1 43/64
1/4-28 3 2-4 1/2 1 25/32
5/16-18 F 2-12 1 59/64
5/16-24 I 2 1/4-4 1/2 2 1/32
3/8-16 O 2 1/2-4 2 1/4
3/8-24 Q 2 3/4-4 2 1/2
7/16-14 U 3-4 2 3/4
7/16-20 25/64
Tap Size Drill Size
Decimal
Equivalent
Nearest
Fraction
3x.50 #39 0.0995 3/32
3x.60 3/32 0.0937 3/32
4x.70 #30 0.1285 1/8
4x.75 1/8 0.125 1/8
5x.80 #19 0.166 11/64
5x.90 #20 0.161 5/32
6x1.00 #9 0.196 13/64
7x1.00 16/64 0.234 15/64
8x1.00 J 0.277 9/32
8x1.25 17/64 0.265 17/64
9x1.00 5/16 0.3125 5/16
9x1.25 5/16 0.3125 5/16
10x1.25 11/32 0.3437 11/32
10x1.50 R 0.339 11/32
11x1.50 3/8 0.375 3/8
12x1.50 13/32 0.406 13/32
12x1.75 13/32 0.406 13/32
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