Page 441 - THREADING CATALOG

THREAD DRILLING

Pre-Thread DCT Drills

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
Head Head Head M Helicoil Head
Drill Designation Dia. Range M Thread Dia. MF Head Dia. TR 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
UNF Head UNC Head Helicoil Head BSW Head BSF Head
Drill Designation Dia. Range Thread Dia. Thread Dia. Thread Dia. Thread Dia. Thread Dia.
UNC
DCT 085-026-14B-M10 8.30-8.99 UNF 3/8-24 8.5 8.4
5/16-18
UNC BSW BSF
DCT 102-030-14B-M12 10.0-10.99 10.8 10.5 10.99
1/2-13 1/2-12 1/2-16
UNC BSF
DCT 120-035-16B-M14 12.0-12.99 12.3 12.50
9/16-12 9/16-16
DCT 140-039-18B-M16 14.0-14.99 UNF 5/8-18 14.5
DCT 175-042-20B-M20 17.3-17.99 UNF 3/4-16 17.5
Inch Threads
UNJF
NPT Head BSF Head BSP Head UNEF Head Helicoil Head
Drill Designation Dia. Range Thread Dia. Thread Dia. Thread Dia. Thread Dia. Thread Dia.
NPT G UNEF UNJF
DCT 085-026-14B-M10 8.30-8.99 8.5 8.8 8.7 8.6
1/8-27 1/8-28 3/8-32 3/8-24
BSF
DCT 102-030-14B-M12 10.0-10.99 10.99
1/2-16
BSF
DCT 120-035-16B-M14 12.0-12.99 12.50
9/16-16
NPT UNEF UNJF
DCT 140-039-18B-M16 14.0-14.99 14.5 14.8 14.5
3/8-18 5/8-24 5/8-18
NPT UNEF
DCT 175-042-20B-M20 17.3-17.99 17.5 17.8
1/2-14 3/4-20

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