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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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