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Metric Fine Thread (I.S.O.)NominalTappingDiameterDrillof Threads Pitch Diametermm mm mmM2.0 0.25 1.75M2.2 0.25 1.95M2.5 0.35 2.15M3.0 0.35 2.65M3.5 0.35 3.15M4.0 0.50 3.50M4.5 0.50 4.00M5.0 0.50 4.50M6.0 0.75 5.20M7.0 0.75 6.20M8.0 0.75 7.20M8.0 1.00 7.00M9.0 0.75 8.20M9.0 1.00 8.00M10.0 1.00 9.00M10.0 1.25 8.80M11.0 1.00 10.00M12.0 1.00 11.00Metric Fine Thread (I.S.O.)NominalTappingDiameterDrillof Threads Pitch Diametermm mm mmM12.0 1.25 10.80M12.0 1.50 10.50M14.0 1.00 13.00M14.0 1.25 12.80M14.0 1.50 12.50M16.0 1.00 15.00M16.0 1.50 14.50M18.0 1.00 17.00M18.0 1.50 16.50M18.0 2.00 16.00M20.0 1.00 19.00M20.0 1.50 18.50M20.0 2.00 18.00M22.0 1.00 21.00M22.0 1.50 20.50M22.0 2.00 20.00M24.0 1.00 23.00M24.0 1.50 22.50Metric Fine Thread (I.S.O.)NominalTappingDiameterDrillof Threads Pitch Diametermm mm mmM24.0 2.00 22.00M25.0 1.50 23.50M25.0 2.00 23.00M27.0 1.50 25.50M28.0 1.50 26.50M30.0 1.50 28.50M32.0 1.50 30.50M33.0 2.00 31.00M36.0 3.00 33.00M39.0 3.00 36.00M40.0 1.50 38.50M40.0 3.00 37.00M42.0 4.00 38.00M45.0 4.00 41.00M48.0 4.00 44.00M52.0 4.00 48.00M56.0 4.00 52.00M60.0 4.00 56.008: DRILLING & CUTTINGFlutelessFlutelessFlutelessTap &SizeTappingDrillTap &SizeTappingDrillTap &SizeTappingDrillMetric Coarse (I.S.O.)M32.8mmM3.5 3.2mmM43.7mmM54.6mmM65.6mmM87.4mmM109.3mmM1211.1mmB.S.W.1/8” 2.9mm3/16” 4.2mm1/4” 5.7mm5/16” 7.2mm3/8” 8.7mmBritish Association Thread (B.A.)U.N.F.No.42.6mmNo.63.2mmNo.83.8mmNo.10 4.5mm1/4” 5.9mm5/16” 7.5mm3/8” 9.0mm1/2” 12.1mmB.A.No.2No.4No.6No.84.4mm3.3mm2.6mm2.0mmU.N.C.No.2 1.95mmNo.4 2.55mmNo.63.2mmNo.83.8mmNo.10 4.3mm1/4” 5.8mm5/16” 7.3mm3/8” 8.8mm1/2” 11.7mmB.S.F.1/4” 5.8mm5/16” 7.3mm3/8” 8.9mmB.A. Threads Overall Core Tapping ClearanceNo. per inch Diameter Diameter Pitch Depth Radius Drill DrillNo.0 25.38 .2362” .1890” .0394” .0236” .0072” 5.1mm 1/4”No.1 28.25 .2087” .1663” .0354” .0212” .0064” 4.5mm 5.5mmNo.2 31.36 .1850” .1468” .0319” .0191” .0058” 4.0mm 4.9mmNo.3 34.84 .1614” .1272” .0287” .0172” .0052” 3.4mm 11/64”No.4 38.46 .1417” .1105” .0260” .0156” .0047” 3.0mm 3.8mmNo.5 43.10 .1260” .0980” .0232” .0139” .0042” 2.65mm 3.4mmNo.6 47.85 .1102” .0852” .0209” .0125” .0038” 2.3mm 3.0mmNo.7 52.91 .0984” .0758” .0189” .0113” .0034” 2.05mm 2.7mmNo.8 59.17 .0866” .0664” .0169” .0101” .0031” 1.8mm 3/32”No.9 64.94 .0748” .0564” .0154” .0092” .0028” 1.65mm 2.1mmNo.10 72.46 .0669” .0503” .0138” .0083” .0025” 1.4mm 1.8mmNo.11 81.97 .0591” .0445” .0122” .0073” .0022” 1.2mm 1/16”No.12 90.91 .0511” .0375” .0110” .0066” .0020” 1.05mm 1.45mmAdelaide08 8396 27818.033© 2011 ALLFASTENERS