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       INDEXABLE DRILLS  Pre-Thread DCT Drills                                              USER GUIDE





                There are two main applications
                for pre-thread hole drilling:
                Drilling pre-thread blind and through holes:
                Drilling with a 45° chamfer







                Drilling and counter boring








                                  6 mm max


                Pre-Thread DCT Metric Threads
                Recommended Diameters
                                                                                              M
                                        Dia.      M     Head    MF     Head    TR     Head   Helicoil   Head
                 Drill Designation      Range   Thread  Dia.   Head     Dia.  Thread  Dia.  Thread   Dia.
                                                 M8       6.8  MF8X0.75    7.20  TR10X3    7.49
                 DCT 068-021-14B-M8    6.80-7.49
                                                               MF8X1      7.00
                                                 M10      8.5  MF10X1     8.99  TR10X1.5    8.60  M8    8.40
                 DCT 085-026-14B-M10   8.30-8.99
                                                              MF10X1.25    8.80
                                                 M12    10.2   MF11X1   10.00  TR12X2  10.20  M10   10.50
                                                               MF12X1   10.99  TR14X4  10.50
                 DCT 102-030-14B-M12   10.0-10.99
                                                              MF12X1.25  10.80
                                                              MF12X1.5  10.50
                                                 M14    12.0   MF13X1   12.00  TR14X2  12.20  M12   12.50
                                                               MF14X1   12.99  TR16X4  12.30
                 DCT 120-035-16B-M14   12.0-12.99
                                                              MF14X1.25  12.80
                                                              MF14X1.5  12.50
                                                 M16    14.0   MF14X1   14.00  TR18X4  14.30  M14   14.99
                 DCT 140-039-18B-M16   14.0-14.99              MF16X1   14.99
                                                              MF16X1.5  14.50
                                                 M20    17.5                  TR22X5  17.30
                 DCT 175-042-20B-M20   17.3-17.99
                                                               MF20X2   17.99
                 DCT 210-048-25B-M24   21.0-21.99  M24  21.0   MF22X1   21.00
                Inch Threads
                                                                       UNC
                                       Dia.   UNF  Head   UNC    Head        Head  BSW  Head   BSF   Head
                                                                      Helicoil
                Drill Designation     Range  Thread  Dia.  Thread  Dia.  Thread  Dia.  Thread  Dia.  Thread  Dia.
                DCT 085-026-14B-M10   8.30-8.99 UNF3/8-24   8.5     UNC5/16-18  8.4
                DCT 102-030-14B-M12 10.0-10.99          UNC1/2-13  10.8          BSW1/2-12 10.5  BSF1/2-16  10.99
                DCT 120-035-16B-M14 12.0-12.99          UNC9/16-12 12.3                      BSF9/16-16 12.50
                DCT 140-039-18B-M16 14.0-14.99 UNF5/8-18 14.5
                DCT 175-042-20B-M20 17.3-17.99 UNF3/4-16 17.5

                Inch Threads
                                                                                               UNJF
                                       Dia.   NPT   Head   BSF   Head  BSP  Head  UNEF  Head  Helicoil  Head
                Drill Designation     Range  Thread  Dia.  Thread  Dia. Thread Dia.  Thread  Dia.  Thread  Dia.
                DCT 085-026-14B-M10    8.30-8.99 NPT1/8-27    8.5    G1/8-28  8.8  UNEF3/8-32    8.7  UNJF3/8-24    8.6
                DCT 102-030-14B-M12  10.0-10.99          BSF1/2-16  10.99
                DCT 120-035-16B-M14  12.0-12.99          BSF9/16-16 12.50
                DCT 140-039-18B-M16  14.0-14.99 NPT3/8-18  14.5                 UNEF5/8-24  14.8  UNJF5/8-18  14.5
                DCT 175-042-20B-M20  17.3-17.99 NPT1/2-14  17.5                 UNEF3/4-20  17.8





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