| Standard Drill Sizes - Inches |
Drill | | Decimal | Drill | | Decimal | Drill | | Decimal | Drill | | Decimal | | 80 | = | .0135 | 43 | = | .089 | 8 | = | .199 | 25/64 | = | .3906 | | 79 | = | .0145 | 42 | = | .0935 | 7 | = | .201 | X | = | .397 | | 1/64 | = | .0156 | 3/32 | = | .0938 | 13/64 | = | .2031 | Y | = | .404 | | 78 | = | .016 | 41 | = | .096 | 6 | = | .204 | 13/32 | = | .4063 | | 77 | = | .018 | 40 | = | .098 | 5 | = | .2055 | Z | = | .413 | | 76 | = | .020 | 39 | = | .0995 | 4 | = | .209 | 27/64 | = | .4219 | | 75 | = | .021 | 38 | = | .1015 | 3 | = | .213 | 7/16 | = | .4375 | | 74 | = | .0225 | 37 | = | .104 | 7/32 | = | .2188 | 29/64 | = | .4531 | | 73 | = | .024 | 36 | = | .1065 | 2 | = | .221 | 15/32 | = | .4688 | | 72 | = | .025 | 7/64 | = | .1094 | 1 | = | .228 | 31/64 | = | .4844 | | 71 | = | .026 | 35 | = | .110 | A | = | .234 | 1/2 | = | .500 | | 70 | = | .028 | 34 | = | .111 | 15/64 | = | .2344 | 33/64 | = | .5156 | | 69 | = | .0292 | 33 | = | .113 | B | = | .238 | 17/32 | = | .5313 | | 68 | = | .031 | 32 | = | .116 | C | = | .242 | 35/64 | = | .5469 | | 1/32 | = | .0313 | 31 | = | .120 | D | = | .246 | 9/16 | = | .5625 | | 67 | = | .032 | 1/8 | = | .1250 | 1/4 (E) | = | .250 | 37/64 | = | .5781 | | 66 | = | .033 | 30 | = | .1285 | F | = | .257 | 19/32 | = | .5938 | | 65 | = | .035 | 29 | = | .136 | G | = | .261 | 39/64 | = | .6094 | | 64 | = | .036 | 28 | = | .1405 | 17/64 | = | .2656 | 5/8 | = | .625 | | 63 | = | .037 | 9/64 | = | .1406 | H | = | .266 | 41/64 | = | .6406 | | 62 | = | .038 | 27 | = | .144 | I | = | .272 | 21/32 | = | .6563 | | 61 | = | .039 | 26 | = | .147 | J | = | .277 | 43/64 | = | .6719 | | 60 | = | .040 | 25 | = | .1495 | K | = | .281 | 11/16 | = | .6875 | | 59 | = | .041 | 24 | = | .152 | 9/32 | = | .2813 | 45/64 | = | .7031 | | 58 | = | .042 | 23 | = | .154 | L | = | .290 | 23/32 | = | .7188 | | 57 | = | .043 | 5/32 | = | .1563 | M | = | .295 | 47/64 | = | .7344 | | 56 | = | .0465 | 22 | = | .157 | 19/64 | = | .2969 | 3/4 | = | .750 | | 3/64 | = | .0469 | 21 | = | .159 | N | = | .302 | 49/64 | = | .7656 | | 55 | = | .052 | 20 | = | .161 | 5/16 | = | .3125 | 25/32 | = | .7813 | | 54 | = | .055 | 19 | = | .166 | O | = | .316 | 51/64 | = | .7969 | | 53 | = | .0595 | 18 | = | .1695 | P | = | .323 | 13/16 | = | .8125 | | 1/16 | = | .0625 | 11/64 | = | .1719 | 21/64 | = | .3281 | 53/64 | = | .8281 | | 52 | = | .0635 | 17 | = | .173 | Q | = | .332 | 27/32 | = | .8438 | | 51 | = | .067 | 16 | = | .177 | R | = | .339 | 55/64 | = | .8594 | | 50 | = | .070 | 15 | = | .180 | 11/32 | = | .3438 | 7/8 | = | .875 | | 49 | = | .073 | 14 | = | .182 | S | = | .348 | 57/64 | = | .8906 | | 48 | = | .076 | 13 | = | .185 | T | = | .358 | 29/32 | = | .9063 | | 5/64 | = | .0781 | 3/16 | = | .1875 | 23/64 | = | .3594 | 59/64 | = | .9219 | | 47 | = | .0785 | 12 | = | .189 | U | = | .368 | 15/16 | = | .9375 | | 46 | = | .081 | 11 | = | .191 | 3/8 | = | .375 | 61/64 | = | .9531 | | 45 | = | .082 | 10 | = | .1935 | V | = | .377 | 31/32 | = | .9688 | | 44 | = | .086 | 9 | = | .196 | W | = | .386 | 63/64 | = | .9844
|
TAPPINGTap Drills and Clearance Drills for Machine Screws
with American National Thread Form | Size of Screw | No. of
Threads
per
Inch | Tap Drills | Clearance Hole Drills | No.
or
Dia. | Decimal
Equiv. | Drill
Size | Decimal
Equiv. | Close Fit | Free Fit | Drill
Size | Decimal
Equiv. | Drill
Size | Decimal
Equiv. | | 0 | .060 | 80 | 3/64 | .0469 | 52 | .0635 | 50 | .0700 | | 1 | .073 | 64
72 | 53
53 | .5959
.0595 | 48 | .0760 | 46 | .0810 | | 2 | .086 | 56
64 | 50
50 | .0700
.0700 | 43 | .0890 | 41 | .0960 | | 3 | .099 | 48
56 | 47
45 | .0785
.0820 | 37 | .1040 | 35 | .1100 | | 4 | .112 | 36*
40
48 | 44
43
42 | .0860
.0890
.0935 | 32 | .1160 | 30 | .1285 | | 5 | .125 | 40
44 | 38
37 | .1015
.1040 | 30 | .1285 | 29 | .1360 | | 6 | .138 | 32
40 | 36
33 | .1065
.1130 | 27 | .1440 | 25 | .1495 | | 8 | .164 | 32
36 | 29
29 | .1360
.1360 | 18 | .1695 | 16 | .1770 | | 10 | .190 | 24
32 | 25
21 | .1495
.1590 | 9 | .1960 | 7 | .2010 | | 12 | .216 | 24
28 | 16
14 | .1770
.1820 | 2 | .2210 | I | .2280 | | 14 | .242 | 20*
24* | 10
7 | .1935
.2010 | D | .2460 | F | .2570 | | 1/4 | .250 | 20
28 | 7
3 | .2010
.2130 | F | .2570 | H | .2660 | | 5/16 | .3125 | 18
24 | F
I | .2570
.2720 | P | .3230 | Q | .3320 | | 3/8 | .375 | 16
24 | 5/16
Q | .3125
.3320 | W | .3860 | X | .3970 | | 7/16 | .4375 | 14
20 | U
25/64 | .3680
.3906 | 29/64 | .4531 | 15/32 | .4687 | | 1/2 | .500 | 13
20 | 27/64
29/64 | .4219
.4531 | 33/64 | .5156 | 17/32 | .5312 |
* Screws marked with asterisk (*) are not in the American Standard but are from the former A.S.M.E. Standard.
|
|
