CNC-K™ Precision Countersinks

Designed for CNC and NC Machining Applications

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Precision for Automated Machining

CNC-K countersinks are specifically engineered for the demands of CNC and NC machining centers.

Unlike standard countersinks, CNC-K tools feature tighter tolerances on all critical dimensions including body diameter, shank diameter, and included angle. This precision ensures consistent countersink depth and diameter in automated production environments.

Tight Tolerances

  • Tighter tolerances on angles, diameters and lengths for setting accuracy
  • Nose diameter held to +.001"/-.000"
  • 6-flute Chatterless tooth geometry

CNC Benefits

  • Consistent depth control
  • Repeatable results
  • Tool-to-tool consistency
  • Reduced setup time
CNC-K Precision Countersinks for CNC Machining
Available Configurations
  • Angles: 60°, 82°, 90°, 100°, 110°, 120°
  • Materials: HSS, Carbide
  • Sizes: 1/4" to 1" body single ended, 1/8" to 3/4" double ended
  • Flutes: 6-flute chatterless

CNC-K HSS Countersinks

Premium M2 high-speed steel with precision tolerances for CNC applications. Available in all 6 standard included angles. The nose diameter depends on the angle, so each body size is listed once per nose diameter. See the speed and feed page for programming and setup assistance.

Body Dia. Nose Dia. (+.001/-.000) Shank Dia. OAL Shank Length Tool Name 60° EDP 82° EDP 90° EDP 100° EDP 110° EDP 120° EDP
1/4".0783/16"1-1/2"3/4"CNC-K-1/402970-----
1/4".0463/16"1-1/2"3/4"CNC-K-1/4-0298002990030000301003020
3/8".1251/4"1-3/4"7/8"CNC-K-3/802971-----
3/8".0781/4"1-3/4"7/8"CNC-K-3/8-029810299103001--
3/8".0621/4"1-3/4"7/8"CNC-K-3/8----0301103021
1/2".1563/8"2-1/8"1-1/8"CNC-K-1/202972-----
1/2".1093/8"2-1/8"1-1/8"CNC-K-1/2-029820299203002--
1/2".0783/8"2-1/8"1-1/8"CNC-K-1/2----0301203022
5/8".2033/8"2-3/8"1-1/8"CNC-K-5/802973-----
5/8".1253/8"2-3/8"1-1/8"CNC-K-5/8-029830299303003--
5/8".1093/8"2-3/8"1-1/8"CNC-K-5/8----0301303023
3/4".2501/2"2-11/16"1-5/16"CNC-K-3/402974-----
3/4".1561/2"2-11/16"1-5/16"CNC-K-3/4-029840299403004--
3/4".1251/2"2-11/16"1-5/16"CNC-K-3/4----0301403024
7/8".2811/2"2-13/16"1-5/16"CNC-K-7/802975-----
7/8".1721/2"2-13/16"1-5/16"CNC-K-7/8-029850299503005--
7/8".1401/2"2-13/16"1-5/16"CNC-K-7/8----0301503025
1".3281/2"2-13/16"1-5/16"CNC-K-102976-----
1".2031/2"2-13/16"1-5/16"CNC-K-1-029860299603006--
1".1711/2"2-13/16"1-5/16"CNC-K-1----0301603026
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CNC-K Carbide Countersinks

Solid carbide for maximum tool life in high-volume production and abrasive materials. Available in all 6 standard included angles.

Body Dia. Nose Dia. (+.001/-.000) Shank Dia. OAL Shank Length Tool Name 60° EDP 82° EDP 90° EDP 100° EDP 110° EDP 120° EDP
1/4".0783/16"1-1/2"1-3/16"CNC-K-1/4-W03120-----
1/4".0463/16"1-1/2"1-3/16"CNC-K-1/4-W-0313003140031500316003170
3/8".1251/4"2-1/4"1-3/4"CNC-K-3/8-W03121-----
3/8".0781/4"2-1/4"1-3/4"CNC-K-3/8-W-031310314103151--
3/8".0621/4"2-1/4"1-3/4"CNC-K-3/8-W----0316103171
1/2".1563/8"2-1/2"2"CNC-K-1/2-W03122-----
1/2".1093/8"2-1/2"2"CNC-K-1/2-W-031320314203152--
1/2".0783/8"2-1/2"2"CNC-K-1/2-W----0316203172
5/8".2033/8"2-5/8"2"CNC-K-5/8-W03123-----
5/8".1253/8"2-5/8"2"CNC-K-5/8-W-031330314303153--
5/8".1093/8"2-5/8"2"CNC-K-5/8-W----0316303173
3/4".2501/2"2-3/4"2"CNC-K-3/4-W03124-----
3/4".1561/2"2-3/4"2"CNC-K-3/4-W-031340314403154--
3/4".1251/2"2-3/4"2"CNC-K-3/4-W----0316403174
7/8".2811/2"2-7/8"2"CNC-K-7/8-W03125-----
7/8".1721/2"2-7/8"2"CNC-K-7/8-W-031350314503155--
7/8".1401/2"2-7/8"2"CNC-K-7/8-W----0316503175
1".3281/2"3"2"CNC-K-1-W03126-----
1".2031/2"3"2"CNC-K-1-W-031360314603156--
1".1711/2"3"2"CNC-K-1-W----0316603176

CNC-K Double-Ended Countersinks

Two countersinks in one tool with CNC-K precision tolerances. Double-ended countersinks can lower tool inventories and labor costs: when one end dulls, reverse the tool and continue machining. For nose flats, see the single ended tables above.

HSS Double-Ended

Body Dia. OAL Tool Name 60° EDP 82° EDP 90° EDP 100° EDP 110° EDP 120° EDP
1/8"1-1/2"CNC-K-1/8-DE031770318503193032010320903217
3/16"1-7/8"CNC-K-3/16-DE031780318603194032020321003218
1/4"2"CNC-K-1/4-DE031790318703195032030321103219
5/16"2-1/8"CNC-K-5/16-DE031800318803196032040321203220
3/8"2-1/2"CNC-K-3/8-DE031810318903197032050321303221
1/2"3"CNC-K-1/2-DE031820319003198032060321403222
5/8"3-1/4"CNC-K-5/8-DE031830319103199032070321503223
3/4"3-1/2"CNC-K-3/4-DE031840319203200032080321603224

Carbide Double-Ended

Body Dia. OAL Tool Name 60° EDP 82° EDP 90° EDP 100° EDP 110° EDP 120° EDP
1/8"1-1/2"CNC-K-1/8-W-DE034230343103439034470345503463
3/16"1-7/8"CNC-K-3/16-W-DE034240343203440034480345603464
1/4"2"CNC-K-1/4-W-DE034250343303441034490345703465
5/16"2-1/8"CNC-K-5/16-W-DE034260343403442034500345803466
3/8"2-1/2"CNC-K-3/8-W-DE034270343503443034510345903467
1/2"3"CNC-K-1/2-W-DE034280343603444034520346003468
5/8"3-1/4"CNC-K-5/8-W-DE034290343703445034530346103469
3/4"3-1/2"CNC-K-3/4-W-DE034300343803446034540346203470

Related Products

Chatterless Countersinks™

Standard 6-flute countersinks for all applications.

View Countersinks

3N1™ Countersinks

Combination drill-countersink-chamfer tools.

View 3N1
Regrind Service

Professional resharpening to restore CNC-K tolerances.

Regrind Service Details

Need Technical Support for Your CNC Application?

Our engineers can help optimize tool selection and cutting parameters for your specific machine and material.

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Detailed pages: CNC-K Countersinks
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