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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)

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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
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
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
12902188 N/A 7/32 N/A 5.558 N/A 0.2188 N/A 2 1/2 N/A 64 N/A 2.0000 N/A 51
12902500 N/A 1/4 N/A 6.35 N/A 0.2500 N/A 2 3/4 N/A 70 N/A 2.2000 N/A 56
12902812 N/A 9/32 N/A 7.142 N/A 0.2812 N/A 2 15/16 N/A 75 N/A 2.3000 N/A 58
12903125 N/A 5/16 N/A 7.938 N/A 0.3125 N/A 3 3/16 N/A 81 N/A 2.6000 N/A 66
12903438 N/A 11/32 N/A 8.733 N/A 0.3438 N/A 3 7/16 N/A 87 N/A 2.7000 N/A 69
12903750 N/A 3/8 N/A 9.525 N/A 0.3750 N/A 3 5/8 N/A 92 N/A 2.9000 N/A 74
12904062 N/A 13/32 N/A 10.317 N/A 0.4062 N/A 3 7/8 N/A 98 N/A 3.1000 N/A 79
12904375 N/A 7/16 N/A 11.113 N/A 0.4375 N/A 4 1/16 N/A 103 N/A 3.2000 N/A 81
12904688 N/A 15/32 N/A 11.908 N/A 0.4688 N/A 4 5/16 N/A 110 N/A 3.4000 N/A 86
12905000 N/A 1/2 N/A 12.7 N/A 0.5000 N/A 4 1/2 N/A 114 N/A 3.5000 N/A 89
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
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
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
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