1.73
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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