• Counterbore set - HSS pilot counterbores for M3 to M20 metric cap screws, 5 or 7-piece kit
  • HSS pilot counterbore set for socket head cap screw recesses in metal and wood
  • Pilot counterbore cutters for steel, aluminum, cast iron and wood
  • 4 flute pilot counterbores with fixed pilot for drill press and milling machine
  • Metric cap screw counterbores in full ground and standard pilot sizes
  • High-speed steel counterbore kit for fixture plates, jigs and machine parts
  • M14 standard HSS pilot counterbore, 14.4mm pilot x 24mm cutter, for M14 socket head cap screws
  • HSS counterbore set, 7-piece pilot counterbore kit for metric cap screws
  • M3 standard HSS pilot counterbore, 3.2mm pilot x 5.9mm cutter, for M3 socket head cap screws
  • M8 full ground HSS pilot counterbore for M8 socket head cap screws
  • M12 full ground HSS pilot counterbore for M12 socket head cap screws
  • M14 full ground HSS pilot counterbore for M14 socket head cap screws
  • M16 full ground HSS pilot counterbore for M16 socket head cap screws
  • M3 full ground HSS pilot counterbore for M3 socket head cap screws
  • M8 standard HSS pilot counterbore, 8.2mm pilot x 13.4mm cutter, for M8 socket head cap screws
  • M12 standard HSS pilot counterbore, 12.4mm pilot x 18.8mm cutter, for M12 socket head cap screws
  • M5 full ground HSS pilot counterbore for M5 socket head cap screws
  • M10 full ground HSS pilot counterbore for M10 socket head cap screws
  • M16 standard HSS pilot counterbore, 16.5mm pilot x 26mm cutter, for M16 socket head cap screws
  • M4 standard HSS pilot counterbore, 4.2mm pilot x 7.4mm cutter, for M4 socket head cap screws
  • M5 standard HSS pilot counterbore, 5.2mm pilot x 8.9mm cutter, for M5 socket head cap screws
  • M6 standard HSS pilot counterbore, 6.2mm pilot x 10mm cutter, for M6 socket head cap screws
  • M6 full ground HSS pilot counterbore for M6 socket head cap screws
  • M4 full ground HSS pilot counterbore for M4 socket head cap screws
  • HSS counterbore set, 5-piece pilot counterbore kit for metric cap screws
  • M20 full ground HSS pilot counterbore for M20 socket head cap screws
  • M10 standard HSS pilot counterbore, 10.3mm pilot x 16.8mm cutter, for M10 socket head cap screws
  • M18 full ground HSS pilot counterbore for M18 socket head cap screws

Counterbore Set - HSS Pilot Counterbores for M3-M20 Cap Screws, 5 or 7-Piece Kit or Single Sizes

Counterbore Set - HSS Pilot Counterbores for M3-M20 Cap Screws, 5 or 7-Piece Kit or Single Sizes

$14.99
$14.99
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Counterbore set - HSS pilot counterbores for M3 to M20 metric cap screws, 5 or 7-piece kit

Counterbore Set - HSS Pilot Counterbores for M3-M20 Cap Screws, 5 or 7-Piece Kit or Single Sizes

$14.99
$14.99
SAVE Sold out
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This counterbore set covers metric socket head cap screws with HSS 4 flute pilot counterbores. Buy a 5 or 7-piece kit for the common sizes, or a single size from M3 to M20 to replace a worn cutter.

The pilot follows the drilled clearance hole and the cutter leaves a flat-bottom recess for the screw head. Use it in a drill press, milling machine or CNC center.

Specifications

  • Type: 4 flute pilot counterbore, high-speed steel (HSS)
  • Kits: 5-piece or 7-piece counterbore set
  • Single sizes, full ground: M3, M4, M5, M6, M8, M10, M12, M14, M16, M18 and M20
  • Single sizes, standard (pilot x cutter): M3 3.2 x 5.9mm, M4 4.2 x 7.4mm, M5 5.2 x 8.9mm, M6 6.2 x 10mm, M8 8.2 x 13.4mm, M10 10.3 x 16.8mm, M12 12.4 x 18.8mm, M14 14.4 x 24mm, M16 16.5 x 26mm
  • Workpiece materials: copper, aluminum, tool steel, cast iron and wood

Choosing an option

Full ground and standard cutters are listed separately because their dimensions differ; the standard versions list the pilot and cutter diameters. A kit is the simplest way to cover several screw sizes at once.

FAQ

What is a counterbore used for?
It enlarges the top of a drilled hole with a flat bottom so a socket head cap screw sits flush or below the surface.

Do I drill the hole first?
Yes. Drill the clearance hole for the screw, then counterbore it; the pilot needs the hole to stay centered.

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