|
|
1-11 1 Fraction/Decimal Conversion Chart Drill Bit Sizes (Number) Chart MM/IN. Conversion Chart 8ths 16ths 32nds 64ths 64ths (cont) 1/8 = .125 1/16 = .0625 1/32 = .03125 1/64 = .015625 33/64 = .515625 1/4 = .250 3/16 = .1875 3/32 = .09375 3/64 = .046875 35/64 = .546875 3/8 = .375 5/16 = .3125 5/32 = .15625 5/64 = .078125 37/64 = .578125 1/2 = .500 7/16 = .4375 7/32 = .21875 7/64 = .109375 39/64 = .609375 5/8 = .625 9/16 = .5625 9/32 = .28125 9/64 = .140625 41/64 = .640625 3/4 = .750 11/16 = .6875 11/32 = .34375 11/64 = .171875 43/64 = .671875 7/8 = .875 13/16 = .8125 13/32 = .40625 13/64 = .203125 45/64 = .703125 — 15/16 = .9375 15/32 = .46875 15/64 = .234370 47/64 = .734375 — — 17/32 = .53125 17/64 = .265625 49/64 = .765625 — — 19/32 = .59375 19/64 = .296875 51/64 = .796875 — — 21/32 = .65625 21/64 = .328125 53/64 = .828125 — — 23/32 = .71875 23/64 = .359375 55/64 = .859375 — — 25/32 = .78125 25/64 = .390625 57/64 = .890625 — — 27/32 = .84375 27/64 = .421875 59/64 = .921875 — — 29/32 = .90625 29/64 = .453125 61/64 = .953125 — — 31/32 = .96875 31/64 = .484375 63/64 = .984375 No. Size of Drill in No. Size of Drill in No. Size of Drill in No. Size of Drill in 1 .2280 21 .1590 41 .0960 61 .0390 2 .2210 22 .1570 42 .0935 62 .0380 3 .2130 23 .1540 43 .0890 63 .0370 4 .2090 24 .1520 44 .0860 64 .0360 5 .2055 25 .1495 45 .0820 65 .0350 6 .2040 26 .1470 46 .0810 66 .0330 7 .2010 27 .1440 47 .0785 67 .0320 8 .1990 28 .1405 48 .0760 68 .0310 9 .1960 29 .1360 49 .0730 69 .0292 10 .1935 30 .1285 50 .0700 70 .0280 11 .1910 31 .1200 51 .0670 71 .0260 12 .1890 32 .1160 52 .0635 72 .0250 13 .1850 33 .1130 53 .0595 73 .0240 14 .1820 34 .1110 54 .0550 74 .0225 15 .1800 35 .1100 55 .0520 75 .0210 16 .1770 36 .1065 56 .0465 76 .0200 17 .1730 37 .1040 57 .0430 77 .0180 18 .1695 38 .1015 58 .0420 78 .0160 19 .1660 39 .0995 59 .0410 79 .0145 20 .1610 40 .0980 60 .0400 80 .0135 mm in. mm in. mm in. mm in. .01 .00039 .51 .02008 1 .03937 51 2.00787 .02 .00079 .52 .02047 2 .07874 52 2.04724 .03 .00118 .53 .02087 3 .11811 53 2.08661 .04 .00157 .54 .02126 4 .15748 54 2.12598 .05 .00197 .55 .02165 5 .19685 55 2.16535 .06 .00236 .56 .02205 6 .23622 56 2.20472 .07 .00276 .57 .02244 7 .27559 57 2.24409 .08 .00315 .58 .02283 8 .31496 58 2.28346 .09 .00354 .59 .02323 9 .35433 59 2.32283 .10 .00394 .60 .02362 10 .39370 60 2.36220 .11 .00433 .61 .02402 11 .43307 61 2.40157 .12 .00472 .62 .02441 12 .47244 62 2.44094 .13 .00512 .63 .02480 13 .51181 63 2.48031 .14 .00551 .64 .02520 14 .55118 64 2.51968 .15 .00591 .65 .02559 15 .59055 65 2.55905 .16 .00630 .66 .02598 16 .62992 66 2.59842 .17 .00669 .67 .02638 17 .66929 67 2.63779 .18 .00709 .68 .02677 18 .70866 68 2.67716 .19 .00748 .69 .02717 19 .74803 69 2.71653 .20 .00787 .70 .02756 20 .78740 70 2.75590 .21 .00827 .71 .02795 21 .82677 71 2.79527 .22 .00866 .72 .02835 22 .86614 72 2.83464 .23 .00906 .73 .02874 23 .90551 73 2.87401 .24 .00945 .74 .02913 24 .94488 74 2.91338 .25 .00984 .75 .02953 25 .98425 75 2.95275 .26 .01024 .76 .02992 26 1.02362 76 2.99212 .27 .01063 .77 .03032 27 1.06299 77 3.03149 .28 .01102 .78 .03071 28 1.10236 78 3.07086 .29 .01142 .79 .03110 29 1.14173 79 3.11023 .30 .01181 .80 .03150 30 1.18110 80 3.14960 .31 .01220 .81 .03189 31 1.22047 81 3.18897 .32 .01260 .82 .03228 32 1.25984 82 3.22834 .33 .01299 .83 .03268 33 1.29921 83 3.26771 .34 .01339 .84 .03307 34 1.33858 84 3.30708 .35 .01378 .85 .03346 35 1.37795 85 3.34645 .36 .01417 .86 .03386 36 1.41732 86 3.38582 .37 .01457 .87 .03425 37 1.45669 87 3.42519 .38 .01496 .88 .03465 38 1.49606 88 3.46456 .39 .01535 .89 .03504 39 1.53543 89 3.50393 .40 .01575 .90 .03543 40 1.57480 90 3.54330 .41 .01614 .91 .03583 41 1.61417 91 3.58267 .42 .01654 .92 .03622 42 1.65354 92 3.62204 .43 .01693 .93 .03661 43 1.69291 93 3.66141 .44 .01732 .94 .03701 44 1.73228 94 3.70078 .45 .01772 .95 .03740 45 1.77165 95 3.74015 .46 .01811 .96 .03780 46 1.81102 96 3.77952 .47 .01850 .97 .03819 47 1.85039 97 3.81889 .48 .01890 .98 .03858 48 1.88976 98 3.85826 .49 .01929 .99 .03898 49 1.92913 99 3.89763 .50 .01969 1.0 .03937 50 1.96850 100 3.93700 |