Page 163 - Demo

161PRE-THREAD DRILLING WITH CHAMFERING Pre-Thread DCT Metric Threads Recommended DiametersDrill Designation Dia. RangeMThread Head Dia.MF Thread Head Dia.TR Thread Head Dia.M Helicoil Thread Head Dia.DCT 068-021-14B-M8 6.80-7.49M8 6.8 MF8X0.75 7.20 TR10X3 7.49MF8X1 7.00DCT 085-026-14B-M10 8.30-8.99M10 8.5 MF10X1 8.99 TR10X1.5 8.60 M8 8.40MF10X1.25 8.80DCT 102-030-14B-M12 10.0-10.99M12 10.2 MF11X1 10.00 TR12X2 10.20 M10 10.50MF12X1 10.99 TR14X4 10.50MF12X1.25 10.80MF12X1.5 10.50DCT 120-035-16B-M14 12.0-12.99M14 12.0 MF13X1 12.00 TR14X2 12.20 M12 12.50MF14X1 12.99 TR16X4 12.30MF14X1.25 12.80MF14X1.5 12.50DCT 140-039-18B-M16 14.0-14.99M16 14.0 MF14X1 14.00 TR18X4 14.30 M14 14.99MF16X1 14.99MF16X1.5 14.50DCT 175-042-20B-M20 17.3-17.99M20 17.5 TR22X5 17.30MF20X2 17.99DCT 210-048-25B-M24 21.0-21.99 M24 21.0 MF22X1 21.00