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  • Product Image- Style 172 Carbide Tip Koolcarb®, Extra Length Drill
  • Dimensional Drawing
Submicron carbide tip yields exceptional tool life in tool steels, cast and ductile irons, cast aluminum and other abrasive materials.
  • 125° four facet web thinned point starts best into a larger point angle. Not intended for interrupted cut drilling.
  • High speed “milled” body runs 2 to 4 times gun drill feeds on conventional equipment.
  • Longer carbide yields increased regrinds.
  • Straight flute, right hand cut.
  • Specials available to 1.535” (39.0 mm) Ø. Request intermediate sizes from grind down range.
  • Coolant feeding carbide tip Koolcarb construction provides straighter holes and smoother finish.
  • Shank Ø = Cutting Ø
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    Item #

    Cutting Ø "D" (Inch)

    Cutting Ø "D" (mm)

    Dec. Equiv. (Inch)

    Overall Length "A" (Inch)

    Overall Length "A" (mm)

    Flute Length "B" (Inch)

    Flute Length "B" (mm)

    Usable Flute at Full Regrind "F" (Inch)

    Usable Flute at Full Regrind "F" (mm)

    N/A 1/4 N/A 6.35 N/A 0.2500 N/A 10 N/A 254 N/A 8 N/A 203 N/A 7.2000 N/A 183
    N/A 9/32 N/A 7.142 N/A 0.2812 N/A 10 N/A 254 N/A 8 N/A 203 N/A 7.1000 N/A 181
    N/A 5/16 N/A 7.938 N/A 0.3125 N/A 10 N/A 254 N/A 8 N/A 203 N/A 7.1000 N/A 180
    N/A 11/32 N/A 8.733 N/A 0.3438 N/A 10 N/A 254 N/A 8 N/A 203 N/A 7.1000 N/A 180
    N/A 3/8 N/A 9.525 N/A 0.3750 N/A 11 N/A 279 N/A 9 N/A 229 N/A 8.1000 N/A 205
    N/A 13/32 N/A 10.317 N/A 0.4062 N/A 11 N/A 279 N/A 9 N/A 229 N/A 8.0000 N/A 204
    N/A 7/16 N/A 11.113 N/A 0.4375 N/A 11 N/A 279 N/A 9 N/A 229 N/A 7.9000 N/A 202
    N/A 15/32 N/A 11.908 N/A 0.4688 N/A 12 N/A 305 N/A 9 3/4 N/A 248 N/A 8.6000 N/A 219
    N/A 1/2 N/A 12.7 N/A 0.5000 N/A 12 N/A 305 N/A 9 3/4 N/A 248 N/A 8.6000 N/A 218
    N/A 17/32 N/A 13.492 N/A 0.5312 N/A 12 N/A 305 N/A 9 3/4 N/A 248 N/A 8.5000 N/A 216
    N/A 9/16 N/A 14.288 N/A 0.5625 N/A 13 N/A 330 N/A 10 3/4 N/A 273 N/A 9.5000 N/A 240
    N/A 5/8 N/A 15.875 N/A 0.6250 N/A 13 N/A 330 N/A 10 3/4 N/A 273 N/A 9.4000 N/A 239
    N/A 3/4 N/A 19.05 N/A 0.7500 N/A 14 N/A 356 N/A 11 3/4 N/A 298 N/A 10.2000 N/A 260
    N/A 7/8 N/A 22.225 N/A 0.8750 N/A 15 N/A 381 N/A 12 3/4 N/A 324 N/A 11.1000 N/A 281
    N/A 1 N/A 25.4 N/A 1.0000 N/A 16 N/A 406 N/A 13 3/4 N/A 349 N/A 12.0000 N/A 304
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