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Premium carbide grade provides excellent wear resistance when cutting cast aluminum, bronze, cast and ductile irons, titaniums, graphite, fiberglass, hard plastics and non-ferrous metals. Not recommended for soft steels.
  • Aircraft extension drills are used principally for the drilling of holes in inaccessible places which cannot be reached with regular length drills.
  • 135° split point per NAS-907-P3 improves accuracy and decreases power consumption.
  • 2 to 2.5 times faster speed than standard high speed steel with better hole finish.
  • 6” overall length, threaded shank adapters and eight facet point available upon request.
  • Right hand spiral, right hand cut, heavy duty high speed steel bodies.
  • Allow 2.5 x Ø up to 1/4” (6.35mm), 2 x Ø up to 7/16”) 11.1mm) and over 7/16” allow 1.5 x Ø of flute for chip exit.
  • Fractional sizes are double margin. Letter/wire are single margin.
  • Shank Ø = Cutting Ø
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Item #

Cutting Ø "D" (Inch/Wire)

Cutting Ø "D" (mm)

Dec. Equiv. (Inch)

Flute Length "B" (Inch)

Flute Length "B" (mm)

Usable Flute at Full Regrind "F" (Inch)

Usable Flute at Full Regrind "F" (mm)

12901160 N/A 32 N/A 2.946 N/A 0.1160 N/A 1 5/8 N/A 41 N/A 1.3000 N/A 33
12901200 N/A 31 N/A 3.048 N/A 0.1200 N/A 1 5/8 N/A 41 N/A 1.3000 N/A 33
12901250 N/A 1/8 N/A 3.175 N/A 0.1250 N/A 1 5/8 N/A 41 N/A 1.3000 N/A 33
12901285 N/A 30 N/A 3.264 N/A 0.1285 N/A 1 5/8 N/A 41 N/A 1.3000 N/A 33
12901360 N/A 29 N/A 3.454 N/A 0.1360 N/A 2 N/A 51 N/A 1.6000 N/A 41
12901405 N/A 28 N/A 3.569 N/A 0.1405 N/A 2 N/A 51 N/A 1.6000 N/A 41
12901406 N/A 9/64 N/A 3.571 N/A 0.1406 N/A 2 N/A 51 N/A 1.6000 N/A 41
12901440 N/A 27 N/A 3.658 N/A 0.1440 N/A 2 N/A 51 N/A 1.6000 N/A 41
12901470 N/A 26 N/A 3.734 N/A 0.1470 N/A 2 N/A 51 N/A 1.6000 N/A 41
12901495 N/A 25 N/A 3.797 N/A 0.1495 N/A 2 N/A 51 N/A 1.6000 N/A 41
12901520 N/A 24 N/A 3.861 N/A 0.1520 N/A 2 N/A 51 N/A 1.6000 N/A 41
12901540 N/A 23 N/A 3.912 N/A 0.1540 N/A 2 N/A 51 N/A 1.6000 N/A 41
12901562 N/A 5/32 N/A 3.967 N/A 0.1562 N/A 2 N/A 51 N/A 1.6000 N/A 41
12901570 N/A 22 N/A 3.988 N/A 0.1570 N/A 2 N/A 51 N/A 1.6000 N/A 41
12901590 N/A 21 N/A 4.039 N/A 0.1590 N/A 2 N/A 51 N/A 1.6000 N/A 41
12901610 N/A 20 N/A 4.089 N/A 0.1610 N/A 2 5/16 N/A 59 N/A 1.9000 N/A 48
12901660 N/A 19 N/A 4.216 N/A 0.1660 N/A 2 5/16 N/A 59 N/A 1.9000 N/A 48
12901695 N/A 18 N/A 4.305 N/A 0.1695 N/A 2 5/16 N/A 59 N/A 1.9000 N/A 48
12901719 N/A 11/64 N/A 4.366 N/A 0.1719 N/A 2 5/16 N/A 59 N/A 1.9000 N/A 48
12901730 N/A 17 N/A 4.394 N/A 0.1730 N/A 2 5/16 N/A 59 N/A 1.9000 N/A 48
12901770 N/A 16 N/A 4.496 N/A 0.1770 N/A 2 5/16 N/A 59 N/A 1.9000 N/A 48
12901800 N/A 15 N/A 4.572 N/A 0.1800 N/A 2 5/16 N/A 59 N/A 1.9000 N/A 48
12901820 N/A 14 N/A 4.623 N/A 0.1820 N/A 2 5/16 N/A 59 N/A 1.9000 N/A 48
12901850 N/A 13 N/A 4.7 N/A 0.1850 N/A 2 5/16 N/A 59 N/A 1.9000 N/A 48
12901875 N/A 3/16 N/A 4.763 N/A 0.1875 N/A 2 5/16 N/A 59 N/A 1.9000 N/A 48
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