Drill Size for Tapping Chart - Somta

1 Drill Sizes for Tappingfor 75% thread depth ( *) ( *) ( *) ( *) ( *) ( *) ( *) ( *) ( *) ( *) 1516161718181818202020222222242424252525 2727282830303030323233333335 size in mmDrill Sizein mmDrill Sizein mmPitchPitchPitchPitchMetric FineMetric FineMetric CoarseMetric SizeDrill size in mmDrill Sizein mmPitchPitchMetric FineMetric CoarseMETRIC (60 INCLUDED ANGLE)(Fluteless*) Drill size in mmNominalDiameterSizeNominalDiameterDril l Sizein mmSizeDrill Sizein ASSOCIATION (47 INCLUDED ANGLE) Drill Sizein mmDrill Sizein "1/4"5/16"3/8"7/16"1/2"9/16"5/8"3/4"7/8" 1" " " " " "2"645648404032322424 2824242020181816141212121212 UNFUNCD rill Sizein mm 2718 18 14 14 Sizein mmTPINPS 2718 18 14 14 NATIONAL THREADS (60 INCLUDED ANGLE)

2 Drill Sizein mmDrill Sizein mmDrill Sizein mmTPITPITPISizeBSBBSFBSWD rill Sizein mmDrill Sizein mmTPITPIBSPTBSP1/16"3/32"1/8"5/32"3/16"7 /32"1/4"9/32"5/16"3/8"7/16"1/2"9/16"5/8" 11/16"3/4"7/8"1" " " " " " "2" " " "3" " " "4"60484032242420 18161412121111109877 6 26 26262626 26 26 26 28 19 19 14 14 141411 11 11 11111111 11 28 19 19 14 14 11 11 11 11 BRITISH STANDARD WHITWORTH THREADS (55 INCLUDED ANGLE)Local Sales Tel: 011 390 8700 Fax: 011 397 6720 Email: Export Sales Tel: +27 33 355 6600 Fax: +27 33 394 7509 Email: Technical Toll Free Number: 0800 331 399 Email: Web.