Counterbore Tools | McMaster-Carr

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445 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

Mil. Spec. Counterbores for Hydraulic Port Holes

Mil. Spec. Counterbores for Hydraulic Port Holes

Create contoured profiles in holes for leak-proof hydraulic connections

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

Changeable-Pilot Counterbores

Changeable-Pilot Counterbores

Create counterbored holes for screws of different diameters

Changeable-Pilot Counterbores Sets

Changeable-Pilot Counterbores Sets

Grab whatever counterbore-pilot combo you need to match the diameters of your screw head and pilot hole

Reverse Counterbores

Reverse Counterbores

If the hole is obstructed, counterbore from the reverse side instead

Adjustable-Diameter Counterbores

Adjustable-Diameter Counterbores

The blade adjusts to do the same job as several normal counterbores

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

Drill-Bit Counterbores for Wood

Drill-Bit Counterbores for Wood

Drill and counterbore holes of different depths without changing tools

Drill-Bit Counterbore Sets for Wood

Drill-Bit Counterbore Sets for Wood

Mix and match counterbores and drill bits to match a range of screw sizes

Quick-Change Hex Drill-Bit Counterbores for Wood

Quick-Change Hex Drill-Bit Counterbores for Wood

Pop into a hand-driven tool to drill and counterbore a hole in a single step

Fast-Cutting Smooth-Finish Drill-Bit Counterbores for Wood

Fast-Cutting Smooth-Finish Drill-Bit Counterbores for Wood

Thin cutting edges reduce surface contact to make smooth cuts at high speeds

Other Products

Counterbore Pilots

Counterbore Pilots

Align counterbores in the center of drilled holes

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.)