Drill & Tap Sizes

American Standard Thread ISO Metric Thread Standard Drill Sizes (Inches)
Thread Size Tap Drill Size (Inches) Thread Size Tap Drill Size (mm) Drill Decimal Drill Decimal Drill Decimal Drill Decimal
0-80 3/64" M1 x 0.25 0.75 80 .0135" 43 .089" 8 .199" 25/64" .3906"
1-64 53 M1.1 x 0.25 0.85 79 .0145" 42 .0935" 7 .201" X .397"
1-72 53 M1.2 x 0.25 0.95 1/64" .0156" 3/32" .0938" 13/64" .2031" Y .404"
2-56 51 M1.4 x 0.3 1.10 78 .016" 41 .096" 6 .204" 13/32" .4063"
2-64 50 M1.6 x 0.35 1.25 77 .018" 40 .098" 5 .2055" Z .413"
3-48 5/64" M1.8 x 0.35 1.45 76 .020" 39 .0995" 4 .209" 27/64" .4219"
3-56 46 M2 x 0.4 1.60 75 .021" 38 .1015" 3 .213" 7/16" .4375"
4-40 43 M2.2 x 0.45 1.75 74 .0225" 37 .104" 7/32" .2188" 29/64" .4531"
4-48 42 M2.5 x 0.45 2.05 73 .024" 36 .1065" 2 .221" 15/32" .4688"
5-40 39 M3 x 0.5 2.50 72 .025" 7/64" .1094" 1 .228" 31/64" .4844"
5-44 37 M3.5 x 0.6 2.90 71 .026" 35 .110" A .234" 1/2" .500"
6-32 36 M4 x 0.7 3.30 70 .028" 34 .111" 15/64" .2344" 33/64" .5156"
6-40 33 M4.5 x 0.75 3.70 69 .0292" 33 .113" B .238" 17/32" .5313"
6-48 31 M5 x 0.8 4.20 68 .031" 32 .116" C .242" 35/64" .5469"
8-32 29 M6 x 1 5.00 1/32" .0313" 31 .120" D .246" 9/16" .5625"
8-36 29 M7 x 1 6.00 67 .032" 1/8" .1250" 1/4" (E) .250" 37/64" .5781"
8-40 28 M8 x 1.25 6.80 66 .033" 30 .1285" F .257" 19/32" .5938"
10-24 25 M9 x 1.25 7.80 65 .035" 29 .136" G .261" 39/64" .6094"
10-32 21 M10 x 1.5 8.50 64 .036" 28 .1405" 17/64" .2656" 5/8" .625"
12-24 17 M11 x 1.5 9.50 63 .037" 9/64" .1406" H .266" 41/64" .6406"
12-28 15 M12 x 1.75 10.20 62 .038" 27 .144" I .272" 21/32" .6563"
1/4"-20 7 M14 x 2 12.00 61 .039" 26 .147" J .277" 43/64" .6719"
1/4"-28 3 M16 x 2 14.00 60 .040" 25 .1495" K .281" 11/16" .6875"
5/16"-18 F M18 x 2.5 15.50 59 .041" 24 .152" 9/32" .2813" 45/64" .7031"
5/16"-24 I M20 x 2.5 17.50 58 .042" 23 .154" L .290" 23/32" .7188"
3/8"-16 5/16" M22 x 2.5 19.50 57 .043" 5/32" .1563" M .295" 47/64" .7344"
3/8"-24 Q M24 x 3 21.00 56 .0465" 22 .157" 19/64" .2969" 3/4" .750"
7/16"-14 U M27 x 3 24.00 3/64" .0469" 21 .159" N .302" 49/64" .7656"
7/16"-20 W M30 x 3.5 26.50 55 .052" 20 .161" 5/16" .3125" 25/32" .7813"
1/2"-13 27/64" M33 x 3.5 29.50 54 .055" 19 .166" O .316" 51/64" .7969"
1/2"-20 29/64" M36 x 4 32.00 53 .0595" 18 .1695" P .232" 13/16" .8125"
9/16"-12 31/64" M39 x 4 35.00 1/16" .0625" 11/64" .1719" 21/64" .3281" 53/64" .8281"
9/16"-18 33/64" M42 x 4.5 37.50 52 .0635" 17 .173" Q .332" 27/32" .8438"
5/8"-11 17/32" M45 x 4.5 40.50 51 .067" 16 .177" R .339" 55/64" .8594"
5/8"-18 37/64" M48 x 5 43.00 50 .070" 15 .180" 11/32" .3438" 7/8" .875"
3/4"-10 21/32" M52 x 5 47.00 49 .073" 14 .182" S .348" 57/64" .8906"
3/4"-16 11/16" M56 x 5.5 50.50 48 .076" 13 .185" T .358" 29/32" .9063"
7/8"-9 49/64" M60 x 5.5 54.50 5/64" .0781" 3/16" .1875" 23/64" .3594" 59/64" .9219"
7/8"-14 13/16" M64 x 6 58.00 47 .0785" 12 .189" U .368" 15/16" .9375"
1"-8 7/8" M68 x 6 62.00 46 .081" 11 .191" 3/8" .375" 61/64" .9531"
1"-14 15/16"     45 .082" 10 .1935" V .377" 31/32" .9688"
        44 .086" 9 .196" W .386" 63/64" .9844"
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