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Silver HSS counterbore with tapered shank and pilot hole

Drill America

Drill America DEWCBRTS1/2 1/2" x 3/16" HSS Taper Shank Counterbore

SKU CH-4NDY-9NKAA

A high-speed steel taper-shank counterbore with interchangeable pilot for enlarging existing holes to a flat-bottomed finish

  • Two-piece construction allows interchangeable pilot for flexible hole sizes
  • HSS material withstands heat and wear during counterboring operations
  • Taper shank provides secure fit in machine spindles
  • Enlarges existing holes to create flat seats for bolt heads
  • Integral shank and cutter design simplifies tool setup and use

Drill America HSS Taper Shank Counterbore

This new counterbore from Drill America is a power-tool accessory designed for enlarging existing holes. The two-piece construction combines an integral shank and cutter with an interchangeable pilot. It suits machinists and maintenance technicians who need to create flat seats for bolt heads or nuts.

Two-piece construction with interchangeable pilot

The integral shank and cutter form a single unit while the pilot can be swapped to match different pilot-hole diameters. This arrangement frees the operator from keeping multiple dedicated counterbores on hand. The tool fits directly into a machine spindle equipped for a taper shank.

For spot-facing and deep counterboring tasks

This counterbore serves users who need to spot-face shallow recesses or cut deeper counterbores in a single setup. It is not suited for buyers who require a fixed-pilot design or a straight-shank version for collet chucks. The product carries a California Proposition 65 warning for cancer and reproductive-harm chemicals.

How it compares

Measured against everything we stock in Bits, Hole Saws & Accessory Kits, at today’s prices. Recalculated every night.

Price $21.99
Cheaper than about 60% of the 5,493 comparable items (median $27.99).

Specifications

Product
Brand nameDRILL AMERICA

Questions about this item

What is the first limit reached during sustained counterboring with this HSS taper-shank tool?

Heat buildup at the cutting edges becomes the limiting factor during prolonged use.

How much noise, heat or power does the counterbore generate when running all day?

The high-speed steel cutter produces moderate heat and typical machining noise; power demand depends on the host machine.

Which existing equipment is required to mount and operate this taper-shank counterbore?

A machine spindle or holder that accepts the taper shank is needed before the tool can be used.

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