- Fractions, Numbers, Letters, Decimals and Metric Equivalents - ------------------------------------------------------------------------------------- Fraction/| | |Fraction/| | |Fraction/| | Number/ | Decimal | MM | Number/ | Decimal | MM | Number/ | Decimal | MM Letter | | | Letter | | | Letter | | ----------------------------+----------------------------+---------------------------- 1/64" = .0156" = .396 | #20 = .161" = 4.089 | T = .358" = 9.093 1/32" = .0312" = .795 | #19 = .166" = 4.216 | 23/64" = .3594" = 9.129 #60 = .040" = 1.016 | #18 = .1659" = 4.214 | U = .368" = 9.347 #59 = .041" = 1.041 | 11/64" = .1718" = 4.366 | 3/8" = .375" = 9.525 #58 = .042" = 1.067 | #17 = .173" = 4.394 | V = .377" = 9.576 #57 = .043" = 1.092 | #16 = .177" = 4.496 | W = .386" = 9.804 #56 = .043" = 1.092 | #15 = .180" = 4.572 | 25/64" = .3906" = 9.921 #55 = .0465" = 1.181 | #14 = .182" = 4.623 | X = .397" = 10.084 3/64" = .0468" = 1.191 | #13 = .185" = 4.699 | Y = .404" = 10.262 #55 = .052" = 1.321 | 3/16" = .1875" = 4.763 | 13/32" = .4063" = 10.320 #54 = .055" = 1.397 | #12 = .189" = 4.801 | Z = .413" = 10.490 #53 = .0595" = 1.511 | #11 = .191" = 4.851 | 27/64" = .4219" = 10.716 1/16" = .0625" = 1.588 | #10 = .1935" = 4.915 | 7/16" = .4375" = 11.113 #52 = .0635" = 1.613 | #9 = .196" = 4.978 | 29/64" = .4531" = 11.509 #51 = .067" = 1.701 | #8 = .199" = 5.055 | 15/32" = .46509 = 11.318 #51 = .067" = 1.701 | #8 = .199" = 5.055 | 15/32" = .4688" = 11.908 #50 = .070" = 1.778 | #7 = .201" = 5.105 | 31/64" = .4844" = 12.304 #49 = .073" = 1.854 | 13/64" = .2031" = 5.159 | 1/2" = .500" = 12.700 #48 = .076" = 1.930 | #6 = .204" = 5.182 | 33/64" = .5156" = 13.096 5/64" = .0781" = 1.984 | #5 = .2055" = 5.220 | 17/32" = .5312" = 13.495 #47 = .0785" = 1.994 | #4 = .209" = 5.309 | 35/64" = .5469" = 13.891 #46 = .081" = 2.060 | #3 = .213" = 5.410 | 9/16" = .5625" = 14.288 #45 = .082" = 2.083 | 7/32" = .2188" = 5.558 | 37/64" = .5781" = 14.684 #44 = .086" = 2.184 | #2 = .221" = 5.613 | 19/32" = .5938" = 15.083 #43 = .089" = 2.260 | #1 = .228" = 5.791 | 39/64" = .6094" = 15.479 #42 = .0935" = 2.375 | A = .234" = 5.943 | 5/8" = .625" = 15.875 3/32" = .0937" = 2.383 | 15/64" = .2344" = 5.954 | 41/64" = .6406" = 16.271 #41 = .096" = 2.438 | B = .238" = 6.045 | 21/32" = .6563" = 16.670 #40 = .098" = 2.489 | C = .242" = 6.147 | 43/64" = .6719" = 17.066 #39 = .0995" = 2.527 | D = .246" = 6.248 | 11/16" = .6875" = 17.463 #38 = .1015" = 2.578 | 1/4" = .250" = 6.350 | 45/64" = .7031" = 17.859 #37 = .104" = 2.642 | E = .250" = 6.350 | 23/32" = .7188" = 18.254 #36 = .1065 = 2.705 | F = .257" = 6.528 | 47/64" = .7344" = 18.654 7/64" = .1094" = 2.779 | G = .261" = 6.629 | 3/4" = .750" = 19.050 #35 = .110" = 2.794 | 17/64" = .2656" = 6.746 | 49/64" = .7656" = 19.446 #34 = .111" = 2.819 | H = .266" = 6.756 | 25/32" = .7813" = 19.845 #33 = .113" = 2.870 | I = .272" = 6.909 | 51/64" = .7969" = 20.241 #32 = .116" = 2.946 | J = .277" = 7.036 | 13/16" = .8125" = 20.638 #31 = .120" = 3.048 | K = .281" = 7.137 | 53/64" = .8282" = 21.034 1/8" = .125" = 3.175 | 9/32" = .2813" = 7.145 | 27/32" = .8438" = 21.433 #30 = .1285" = 3.195 | L = .290" = 7.366 | 55/64" = .8594" = 21.821 #29 = .136" = 3.454 | M = .295" = 7.493 | 7/8" = .875" = 22.225 #28 = .1405" = 3.569 | 19/64" = .2969" = 7.541 | 57/64" = .8906" = 22.621 9/64" = .1406" = 3.571 | N = .302" = 7.671 | 29/32" = .9063" = 23.020 #27 = .144" = 3.658 | 5/16" = .3125" = 7.938 | 59/64" = .9219" = 23.416 #26 = .147" = 3.734 | O = .316" = 8.026 | 15/16" = .9375" = 23.813 #25 = .1495" = 3.797 | P = .323" = 8.204 | 61/64" = .9532" = 24.209 #24 = .152" = 3.861 | 21/64" = .3281" = 8.334 | 31/32" = .9688" = 24.608 #23 = .154" = 3.912 | Q = .332" = 8.433 | 63/64" = .9844" = 25.004 5/32" = .1563" = 3.970 | R = .339" = 8.611 | 1" = 1.000" = 25.400 #22 = .157" = 3.988 | 11/32" = .3438" = 8.733 | #21 = .159" = 4.039 | S = .348" = 8.839 |
NOTE: There's three different types drill bits - fraction, number (wire)
and letter. Actually, there's four, including the metric ones. Use the one
that's closest according to the hole you need to drill.
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Brian Miller.