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8: DRILLING & CUTTINGUnified Extra Fine Thread Series (U.N.E.F.)Threads Overall Effective Core Depth Tapping ClearanceSize per inch Diameter Diameter Diameter Pitch of Thread Drill DrillNo.12 32 .216” .196” .178” .031” .019” 4.70mm 5.60mm1/4” 32 .250” .230” .212” .031” .019” 7/32” 6.50mm5/16” 32 .3125” .292” .274” .031” .019” 9/32” 8.10mm3/8” 32 .375” .355” .337” .031” .019” 11/32” 9.70mm7/16” 28 .4375” .414” .394” .036” .022” 10.20mm 11.30mm1/2” 28 .500” .477” .456” .036” .022” 11.80mm 12.90mm9/16” 24 .5625” .535” .511” .042” .026” 13.20mm 14.50mm5/8” 24 .625” .598” .574” .042” .026” 15.00mm 41/64”11/16” 24 .6875” .660” .636” .042” .026” 16.50mm 45/64”3/4” 20 .750” .718” .689” .050” .031” 45/64” 49/64”13/16” 20 .8125” .780” .751” .050” .031” 49/64” 53/64”7/8” 20 .875” .843” .814” .050” .031” 21.00mm 57/64”15/16” 20 .9375” .905” .876” .050” .031” 22.50mm 63/64”1” 20 1.000” .968” .939” .050” .031” 61/64” 1-1/64”Metric Coarse Thread (I.S.O.)Nominal Pitch Basic Basic Basic Minor Basic Minor Recommend. ClearanceDiameter Major Effective Diameter Diameter Tapping DrillDiameter Diameter External Internal Drill SizesThreads Threads Sizesmm mm mm mm mm mm mm mmM1 0.25mm 1.000 0.838 0.693 0.729 0.75 1.05M1.1 0.25mm 1.100 0.938 0.739 0.829 0.85 1.15M1.2 0.25mm 1.200 1.038 0.893 0.929 0.95 1.25M1.4 0.30mm 1.400 1.205 1.032 1.075 1.10 1.45M1.6 0.35mm 1.600 1.373 1.170 1.221 1.25 1.65M1.8 0.35mm 1.800 1.573 1.370 1.421 1.45 1.85M2 0.40mm 2.000 1.740 1.509 1.567 1.60 2.05M2.2 0.45mm 2.200 1.908 1.648 1.713 1.75 2.25M2.5 0.45mm 2.500 2.208 1.948 2.013 2.05 2.60M3 0.50mm 3.000 2.675 2.387 2.459 2.50 3.10M3.5 0.60mm 3.500 3.110 2.764 2.850 2.90 3.60M4 0.70mm 4.000 3.545 3.141 3.242 3.30 4.10M4.5 0.75mm 4.500 4.013 3.580 3.688 3.70 4.60M5 0.80mm 5.000 4.480 4.019 4.134 4.20 5.10M6 1.00mm 6.000 5.350 4.773 4.917 5.00 6.10M7 1.00mm 7.000 6.350 5.773 5.917 6.00 7.20M8 1.25mm 8.000 7.188 6.466 6.647 6.80 8.20M9 1.25mm 9.000 8.188 7.466 7.647 7.80 9.20M10 1.50mm 10.000 9.026 8.160 8.376 8.50 10.20M11 1.50mm 11.000 10.026 9.160 9.376 9.50 11.20M12 1.75mm 12.000 10.863 9.853 10.106 10.20 12.20M14 2.00mm 14.000 12.701 11.546 11.835 12.00 14.25M16 2.00mm 16.000 14.701 13.546 13.835 14.00 16.25M18 2.50mm 18.000 16.376 14.933 15.294 15.50 18.25M20 2.50mm 20.000 18.376 16.933 17.294 17.50 20.25M22 2.50mm 22.000 20.376 18.933 19.294 19.50 22.25M24 3.00mm 24.000 22.051 20.319 20.752 21.00 24.25M27 3.00mm 27.000 25.051 23.319 23.752 24.00 27.25M30 3.50mm 30.000 27.727 25.706 26.211 26.50 30.50M33 3.50mm 33.000 30.727 28.706 29.211 29.50 33.50M36 4.00mm 36.000 33.402 31.093 31.670 32.00 36.50M39 4.00mm 39.000 36.402 34.093 34.670 35.00 39.50M42 4.50mm 42.000 39.077 36.479 37.129 37.50 42.50M45 4.50mm 45.000 42.077 39.479 40.129 40.50 45.50M48 5.00mm 48.000 44.752 41.886 42.587 43.00 48.50M52 5.00mm 52.000 48.752 45.886 46.587 47.00 53.00M56 5.50mm 56.000 52.428 49.252 50.046 50.50 57.008.032MELBOURNE03 9330 0555SYDNEY1300 255 327© 2011 ALLFASTENERS