GENERAL INFORMATION SAE 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 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 . . . . . . . . . . . . . . .
1 1.0 . . . . .
METRIC TAP DRILL SIZES 1.9 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 1 1/4-7 1 7/64 1 1/4-12 1 11/64 1 1/2-6 1 11/32 1 1/2-12 1 27/64 1 3/4-5 1 9/16 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 2 1/2-4 2 1/4 2 3/4-4 2 1/2 3-4 2 3/4 Tap Size Drill Size Decimal Equiva- lent Nearest Fraction 3 x .50 3 x .60 4 x .70 4 x .75 5 x .80 5 x .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