No. 8 Counterbores | McMaster-Carr

Filter by

For Use On

Screw Size

Number of Flutes

Tolerance Rating

Body Diameter

Pilot Diameter

Sold As

Drill Tip Diameter

Pilot Length

Shank Diameter

Shank Type

Pilot Head Diameter

Number of Pieces

Material

Finish

Maximum Hole Drilling Depth

Overall Length

Flute Type

Oversize Amount

DFARS Specialty Metals

Export Control Classification Number (ECCN)

REACH

RoHS

Counterbore Type

Pilot Type

Container Type

How can we improve?

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.)