No. 8 Counterbores | McMaster-Carr

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Stainless Steel

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High-Speed Steel

Finish

Titanium Nitride (TiN) Coated

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DFARS Specialty Metals

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17 Products

About Counterbores

Create flat-bottomed holes, so your screw heads sit flush, recessed, or slightly raised.

Counterbores

Built-In-Pilot Counterbores

Built-In-Pilot Counterbores

The go-to for standard screw-head diameters and thread sizes

Counterbores for High-Profile Rounded-Head Screws

Cut deep openings for tall screw heads

Built-In-Pilot Counterbore Sets

Built-In-Pilot Counterbore Sets

Center the counterbore to cut close-fitting recesses for a range of screw-head diameters

Oversized Counterbores

Oversized Counterbores

Cut an opening a bit wider than your screw head to prevent binding

Oversized Counterbore Sets

Oversized Counterbore Sets

Cut oversized openings for a range of screw-head diameters to prevent binding

Drill-Point Counterbores

Drill-Point Counterbores

Create a counterbored pilot hole without switching to a drill bit

Drill-Point Counterbore Sets

Drill-Point Counterbore Sets

Quickly create counterbored pilot holes for a range of screw sizes

Other Products

Counterbore Drill Bits

Counterbore Drill Bits

A single bit drills and creates a flat surface for the head of a socket head cap screw

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