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Drill America 13/16 inch HSS taper shank counterbore with 1/4 inch pilot hole

Drill America

Drill America 13/16" x 1/4" Pilot Hole HSS Taper Shank Counterbore

SKU CH-N1BH-402QE

HSS taper-shank counterbore with interchangeable 1/4" pilot for enlarging existing holes to 13/16"

  • Two-piece design allows interchangeable pilots for flexible counterboring
  • HSS construction withstands heat during repeated cutting operations
  • Taper shank seats securely in machine spindles for accurate alignment
  • 13/16 inch diameter creates flat-bottom holes for bolt heads
  • 1/4 inch pilot guides tool through pre-drilled holes precisely

Drill America 13/16" Counterbore Tool

This Drill America counterbore is a two-piece cutting tool designed to enlarge existing holes with a 13/16" diameter. It features a taper shank for machine mounting and an interchangeable pilot for guided alignment. The high-speed steel construction suits general-purpose counterboring and spot-facing tasks in metalworking shops.

Interchangeable Pilot System

The tool uses a separate pilot that fits into a pre-drilled guide hole to keep the cutter centred during operation. This design allows the operator to swap pilots for different guide-hole sizes without replacing the entire cutter body. The flexibility reduces tool inventory while maintaining accurate concentricity between the original and enlarged bores.

Taper Shank Mounting Limits

The integral taper shank fits directly into compatible machine spindles or sleeves without a separate chuck. This interface transmits torque through friction and requires a matching taper socket in the equipment. Machines lacking the correct internal taper cannot accept the tool, and worn or damaged sockets will reduce holding power and cutting accuracy.

How it compares

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

Price $28.99
Typical for this category: the median of 5,493 items is $27.99.

Specifications

Product
Brand nameDRILL AMERICA

Questions about this item

Will the 13/16" cutter or the 1/4" pilot need replacing first?

The 1/4" pilot is interchangeable, so it can be swapped out independently when worn while the counterbore cutter remains in service.

What stops continuous counterboring in hard material?

Heat buildup in the high-speed steel cutter limits sustained cutting before the tool must cool.

Does the taper shank run hot during all-day use?

The high-speed steel body conducts heat into the shank, so the tool and holder become warm during extended operation.

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