Piloted Countersinks | McMaster-Carr

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188 Products

About Counterbores

Counterboring—Enlarge the top of an existing hole to create a cylindrical-shaped opening with a flat bottom that acts as a seat for the head of a screw or wood plug.

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Countersinking

High-Speed Steel Vibration-Resistant
Through-Hole Countersinks with Pilot for Screws

The built-in pilot maintains alignment in the hole.

Vibration-Resistant Through-Hole
Countersink Sets with Pilot for Screws

Vibration-Resistant Through-Hole Countersink Sets with Pilot for Screws

The built-in pilot maintains alignment in the hole.

High-Speed Steel Drill-Point Countersink Sets
with Two Countersinking Ends for Screws

Carbide Drill-Point Countersink Sets with
Two Countersinking Ends for Screws

Carbide Drill-Point Countersink Sets with Two Countersinking Ends for Screws

For excellent performance on hard and abrasive materials, carbide is harder, stronger, and more wear resistant than high-speed steel.

Counterboring

Metric Size High-Speed Steel
Counterbores with Built-In Pilot

Inch Size High-Speed Steel
Counterbores with Built-In Pilot

Oversized High-Speed Steel
Counterbores with Built-In Pilot

Counterbore screw holes in misaligned sheets or layers of material.

Oversized Carbide-Tipped
Counterbores with Built-In Pilot for Steel

Designed for counterboring screw holes in misaligned sheets or layers of material.

Carbide-Tipped Counterbores
with Built-In Pilot for Steel

To resist damage when cutting steel, these counterbores are C5 carbide-tipped alloy steel.

Oversized Carbide-Tipped Counterbores with Built-In
Pilot for Aluminum, Brass, Bronze, and Cast Iron

Use these counterbores with screw holes in misaligned sheets or layers of material.

Carbide-Tipped Counterbores with Built-In Pilot
for Aluminum, Brass, Bronze, and Cast Iron

C2 carbide-tipped alloy steel has excellent performance on abrasive materials such as cast iron and nonferrous metals.

Counterbores for High-Profile
Rounded-Head Screws

Mil. Spec. Counterbores for Hydraulic Ports

Create contoured profiles for installing hydraulic ports in accordance with military and SAE specifications.

Metric Size Counterbore Sets with Built-In Pilot

Metric Size Counterbore Sets with Built-In Pilot

Inch Size Counterbore Sets with Built-In Pilot

Inch Size Counterbore Sets with Built-In Pilot

Oversized Counterbore Sets with Built-In Pilot

Oversized Counterbore Sets with Built-In Pilot

Use these counterbore sets when the screw holes in sheets or layers of material are misaligned.

The quick brown fox jumped over the lazy dog. Pedestal (35" Ht. x 4" Wd. x 4" Dp.)