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  • Product Image-Style 290 Carbide Tip, Kooltwist®, Heavy Duty, Long Series Drill
  • Dimensional Drawing
Submicron carbide tipped coolant fed oil hole construction cuts best in cast irons, powdered metals, brass, bronze, free machining stainless steels, titaniums and some high temperature alloys.
  • Heavy web slow spiral for maximum rigidity.
  • Right hand spiral, right hand cut.
  • Self centering 125° four facet point is easily re-sharpened on standard point grinding equipment.
  • 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 6 1/8 N/A 156 N/A 3 3/4 N/A 95 N/A 3.1000 N/A 79
N/A 9/32 N/A 7.142 N/A 0.2812 N/A 6 1/4 N/A 159 N/A 3 7/8 N/A 98 N/A 3.2000 N/A 81
N/A 5/16 N/A 7.938 N/A 0.3125 N/A 6 3/8 N/A 162 N/A 4 N/A 102 N/A 3.3000 N/A 83
N/A 11/32 N/A 8.731 N/A 0.3438 N/A 6 1/2 N/A 165 N/A 4 1/8 N/A 105 N/A 3.4000 N/A 86
N/A 3/8 N/A 9.525 N/A 0.3750 N/A 6 3/4 N/A 171 N/A 4 1/4 N/A 108 N/A 3.5000 N/A 88
N/A 13/32 N/A 10.317 N/A 0.4062 N/A 7 N/A 178 N/A 4 3/8 N/A 111 N/A 3.6000 N/A 90
N/A 7/16 N/A 11.113 N/A 0.4375 N/A 7 1/4 N/A 184 N/A 4 5/8 N/A 117 N/A 3.8000 N/A 96
N/A 15/32 N/A 11.906 N/A 0.4688 N/A 7 1/2 N/A 191 N/A 4 7/8 N/A 124 N/A 4.0000 N/A 102
N/A 1/2 N/A 12.7 N/A 0.5000 N/A 7 3/4 N/A 197 N/A 5 N/A 127 N/A 4.1000 N/A 104
N/A 17/32 N/A 13.492 N/A 0.5312 N/A 8 N/A 203 N/A 5 1/4 N/A 133 N/A 4.3000 N/A 109
N/A 9/16 N/A 14.288 N/A 0.5625 N/A 8 1/4 N/A 210 N/A 5 3/8 N/A 137 N/A 4.4000 N/A 112
N/A 19/32 N/A 15.083 N/A 0.5938 N/A 8 1/2 N/A 216 N/A 5 5/8 N/A 143 N/A 4.6000 N/A 116
N/A 5/8 N/A 15.875 N/A 0.6250 N/A 8 3/4 N/A 222 N/A 5 3/4 N/A 146 N/A 4.7000 N/A 118
N/A 21/32 N/A 16.667 N/A 0.6562 N/A 9 N/A 229 N/A 5 7/8 N/A 149 N/A 4.8000 N/A 121
N/A 11/16 N/A 17.463 N/A 0.6875 N/A 9 1/4 N/A 235 N/A 6 N/A 152 N/A 4.8000 N/A 123
N/A 23/32 N/A 18.258 N/A 0.7188 N/A 9 1/2 N/A 241 N/A 6 3/16 N/A 157 N/A 5.0000 N/A 126
N/A 3/4 N/A 19.05 N/A 0.7500 N/A 9 3/4 N/A 248 N/A 6 3/8 N/A 162 N/A 5.1000 N/A 131
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