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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)

12902770 N/A J N/A 7.036 N/A 0.2770 N/A 2 15/16 N/A 75 N/A 2.3000 N/A 58
12902810 N/A K N/A 7.137 N/A 0.2810 N/A 2 15/16 N/A 75 N/A 2.3000 N/A 58
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
12902900 N/A L N/A 7.366 N/A 0.2900 N/A 3 3/16 N/A 81 N/A 2.6000 N/A 66
12902950 N/A M N/A 7.493 N/A 0.2950 N/A 3 3/16 N/A 81 N/A 2.6000 N/A 66
12902969 N/A 19/64 N/A 7.541 N/A 0.2969 N/A 3 3/16 N/A 81 N/A 2.6000 N/A 66
12903020 N/A N N/A 7.671 N/A 0.3020 N/A 3 3/16 N/A 81 N/A 2.6000 N/A 66
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
12903160 N/A O N/A 8.026 N/A 0.3160 N/A 3 3/16 N/A 81 N/A 2.6000 N/A 66
12903230 N/A P N/A 8.204 N/A 0.3230 N/A 3 7/16 N/A 87 N/A 2.7000 N/A 69
12903281 N/A 21/64 N/A 8.344 N/A 0.3281 N/A 3 7/16 N/A 87 N/A 2.7000 N/A 69
12903320 N/A Q N/A 8.433 N/A 0.3320 N/A 3 7/16 N/A 87 N/A 2.7000 N/A 69
12903390 N/A R N/A 8.611 N/A 0.3390 N/A 3 7/16 N/A 87 N/A 2.7000 N/A 69
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
12903480 N/A S N/A 8.839 N/A 0.3480 N/A 3 5/8 N/A 92 N/A 2.9000 N/A 74
12903580 N/A T N/A 9.093 N/A 0.3580 N/A 3 5/8 N/A 92 N/A 2.9000 N/A 74
12903594 N/A 23/64 N/A 9.129 N/A 0.3594 N/A 3 5/8 N/A 92 N/A 2.9000 N/A 74
12903680 N/A U N/A 9.347 N/A 0.3680 N/A 3 5/8 N/A 92 N/A 2.9000 N/A 74
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
12903770 N/A V N/A 9.576 N/A 0.3770 N/A 3 5/8 N/A 92 N/A 2.9000 N/A 74
12903860 N/A W N/A 9.804 N/A 0.3860 N/A 3 7/8 N/A 98 N/A 3.1000 N/A 79
12903906 N/A 25/64 N/A 9.921 N/A 0.3906 N/A 3 7/8 N/A 98 N/A 3.1000 N/A 79
12903970 N/A X N/A 10.084 N/A 0.3970 N/A 3 7/8 N/A 98 N/A 3.1000 N/A 79
12904040 N/A Y N/A 10.262 N/A 0.4040 N/A 3 7/8 N/A 98 N/A 3.1000 N/A 79
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
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