Center Drill Bits | McMaster-Carr

For applications where the workpiece will go through several machining processes, these countersinks bevel the outer edges of the hole and provide an additional 120° chamfer to prevent damage to the center hole.

Radius-Style Drill-Point Countersinks for Lathe Centers

These countersinks create a surface that minimizes contact between the material and the lathe centers to prevent damage and allow for more precise machining.

Starter-Hole-Eliminating Drill-Point Countersinks
with Two Countersinking Ends for Lathe Centers

Starter-Hole-Eliminating Drill-Point
Countersinks for Lathe Centers

No need to create a starter hole—the drill point is incorporated into the countersink flutes.

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

Use in general purpose applications.

Carbide Drill-Point Countersinks with
Two Countersinking Ends for Screws

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

High-Speed Steel Drill-Point Countersinks for Screws

For general purpose use.

High-Speed Steel Starter-Hole-Eliminating
Drill-Point Countersinks for Screws

To remove the need for a starter hole, the drill point is incorporated into the countersink flutes.

Carbide Starter-Hole-Eliminating Drill-Point
Countersinks with Two Countersinking Ends for Screws

Carbide Starter-Hole-Eliminating Drill-Point
Countersinks with Two Countersinking Ends for Rivets

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

High-Speed Steel Starter-Hole-Eliminating
Drill-Point Countersinks for Rivets

For general purpose use.

Countersinking Drill Bits for Screws

Also known as step drill bits. The 82° countersink angle is compatible with the profile of flat- and oval-head inch screws.

Drill-Bit Countersinks with Drill Bit

These countersinks come attached to a high-speed steel jobbers’ bit.

High-Speed Steel Drill-Bit Countersinks for Screws

Use on plastic and most metals.

Carbon Steel Drill-Bit Countersinks for Screws

For use on wood and plastic.

Quick-Change Combination
Countersinking Drill and Screwdriver Bits

Drill, countersink, and drive screws without switching three separate bits in and out of your power tool.

Countersink Sets

Cobalt Steel Drill-Point Countersink
Sets for Lathe Centers

With more heat and abrasion resistance than high-speed steel, cobalt steel is often used on hard-to-machine materials.

High-Speed Steel Drill-Point
Countersink Sets for Lathe Centers

Choose for general purpose applications.

Carbide Drill-Point Countersink Sets for Lathe Centers

Carbide is harder, stronger, and more wear resistant than cobalt steel and high-speed steel for better performance on hard and abrasive materials.

High-Speed Steel Drill-Point
Countersink Sets for Screws

Use in general purpose applications.

High-Speed Steel 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.

High-Speed Steel Drill-Bit Countersink Sets

For use with most metals in addition to plastic and wood.

Carbon Steel Drill-Bit Countersink Sets

Use with plastic and wood.

Quick-Change Combination Countersinking
Drill and Screwdriver Bit Sets

Fasten differently sized screws with these sets. They save you the effort of switching three separate bits in and out of a power tool, instead letting you flip between a countersinking drill and a screwdriver bit with a single hand.

Drill Bits

These jobbers'-length bits have the rigidity and length required for most applications.

Short-Length Drill Bits

Also known as screw-machine and stub-length bits, these provide maximum rigidity for drilling straighter holes than jobbers'- and maintenance-length drill bits.

Maintenance-Length Drill Bits

Also known as mechanics' bits, these are shorter and more rigid than jobbers’ bits but longer than short-length bits.

Short-Flute Extended-Length Drill Bits

The short flutes provide increased rigidity for drilling straighter holes than standard extended-length drill bits.

Chip-Clearing Drill Bits

These jobbers'-length bits have the rigidity and length required for most applications.

Extended-Length Chip-Clearing Drill Bits

Cobalt Steel Drill Bits

Short-Flute Cobalt Steel Drill Bits

The short flutes on these jobbers'-length bits provide increased rigidity for drilling straighter holes.

Short-Length Cobalt Steel Drill Bits

Also known as screw-machine and stub-length bits, these provide maximum rigidity for drilling straighter holes than jobbers'-length drill bits.

Short-Flute Extended-Length Cobalt Steel Drill Bits

The short flutes provide increased rigidity for drilling straighter holes than standard extended-length drill bits.

Extended-Length Cobalt Steel Drill Bits

Chip-Clearing Cobalt Steel Drill Bits

The parabolic spiral flutes lift chips out of the hole, reducing clogging and improving coolant flow.

Carbide Drill Bits

These jobbers'-length bits have the rigidity and length required for most applications.

Short-Length Carbide Drill Bits

Also known as screw-machine and stub-length bits, these provide maximum rigidity for drilling straighter holes than jobbers'-length drill bits.

Smooth-Finish Carbide Drill Bits

Three cutting edges instead of the typical two enable these bits to drill holes with a smoother finish than other bits.

Carbide Drill Bits with Coolant Holes

Holes in these bits allow coolant to be run through the tool for more efficient chip evacuation. Use them in CNC machines with coolant-through technology.

Short-Length Carbide-Tipped Drill Bits

Also known as screw-machine and stub-length bits, these provide maximum rigidity for drilling straighter holes than jobbers'-length drill bits.

Carbide-Tipped Drill Bits

These jobbers'-length bits have the rigidity and length required for most applications.

Short-Flute Extended-Length Carbide-Tipped Drill Bits

The short flutes provide increased rigidity for drilling straighter holes than standard extended-length drill bits.

Cobalt Steel 1/2" Diameter Reduced-Shank Drill Bits

With better heat and wear resistance than high-speed steel, cobalt steel bits can run up to 25% faster and have a longer tool life.

1/2" Diameter Reduced-Shank Drill Bits

Cobalt Steel 3/4" Diameter Reduced-Shank Drill Bits

With better heat and wear resistance than high-speed steel, cobalt steel bits can run up to 25% faster and have a longer tool life.

3/8" Diameter Reduced-Shank Drill Bits

Cobalt Steel Hex-Shank Drill Bits

In addition to resisting heat and wear better than high-speed steel drill bits, these can also run up to 25% faster and have a longer tool life. Insert them into power screwdrivers, impact drivers, and other tools that accept hex shanks.

Hex-Shank Drill Bits

Insert these bits directly into power screwdrivers, impact drivers, and other tools that accept 1/4" hex shanks.

Cobalt Steel Morse Taper-Shank Drill Bits

With better heat and wear resistance than high-speed steel, cobalt steel bits can run up to 25% faster and have a longer tool life.

Threaded-Shank Drill Bits

All have a 1/4"-28 threaded shank which installs directly into the threaded spindle on a compatible drill.

Carbide Drill Bits for Hardened Steel

Harder, stronger, and more wear resistant than carbide-tipped steel, solid-carbide bits maintain their sharp edges longer. They require rigid toolholding to prevent breakage and should not be used in hand-held drilling applications.

Drill Bits for Sheet Metal

These bits have short flutes and a sturdy construction which prevent snagging that deforms sheet metal and thin-wall tubing.

Reversible Drill Bits for Sheet Metal

When one end becomes worn, reverse the bit to use the other end.

Drill Bits for Carbon Fiber, Fiberglass, and Graphite

These jobbers'-length bits have the rigidity and length required for most applications.

Short-Length Drill Bits for Carbon
Fiber, Fiberglass, and Graphite

Also known as screw-machine and stub-length bits, these provide maximum rigidity for drilling straighter holes than jobbers'-length drill bits.

Hex-Shank Masonry Drill Bits
for Tapping Screw Installation

Insert these bits directly into power screwdrivers, impact drivers, and other tools that accept 1/4" hex shanks.

Cobalt Steel Drill Bits for Stainless Steel and Nickel

Cobalt steel bits are heat resistant and maintain their sharp edges when drilling hard material. They are for use in both hand-held drilling and machine-tool applications.

Carbide Drill Bits for Stainless Steel and Nickel

Harder, stronger, and more wear resistant than cobalt steel, solid-carbide bits maintain their sharp edges longer. They require rigid toolholding to prevent breakage and should not be used in hand-held drilling applications.

Drill Bits for Countersunk Holes

Hex-Shank Drill Bits with Guide for Countersunk Holes

Insert directly into power screwdrivers, impact drivers, and other tools that accept a 1/4" hex shank.

Round-Shank Drill Bits with
Guide for Countersunk Holes

The built-in guide has a beveled tip that fits into countersunk holes in hardware, such as hinges and latches, to center the bit.

Hole-Starting Drill Bits

Carbide Hole-Starting Drill Bits

Cobalt Steel Hole-Starting Drill Bits

Cobalt steel bits are heat resistant and maintain their sharp edges when drilling hard material. They are for use in both hand-held drilling and machine-tool applications.

Left-Hand Drill Bits

Cobalt Steel Left-Hand Drill Bits

With better heat and wear resistance than high-speed steel, cobalt steel bits can run up to 25% faster and have a longer tool life.

High-Speed Steel Left-Hand Drill Bits

Use for drilling in most metal.

Drill Bits for Spot Welds

Three drill points allow these bits to separate spot-welded panels without damaging the bottom panel.

General Purpose Drill Bit Sets

Maintenance-Length Drill Bit Sets

Also known as mechanics' bits, these are shorter and more rigid than jobbers’ bits but longer than short-length bits.

Drill Bit Sets

These jobbers'-length bits have the rigidity and length required for most applications.

Short-Length Drill Bit Sets

Also known as screw-machine and stub-length bits, these provide maximum rigidity for drilling straighter holes than jobbers'- and maintenance-length drill bits.

Chip-Clearing Drill Bit Sets

The parabolic spiral flutes lift chips out of the hole, reducing clogging and improving coolant flow.

Short-Flute Cobalt Steel Drill Bit Sets

The short flutes on these jobbers'-length bits provide increased rigidity for drilling straighter holes.

Cobalt Steel Drill Bit Sets

Short-Length Cobalt Steel Drill Bit Sets

Also known as screw-machine and stub-length bits, these provide maximum rigidity for drilling straighter holes than jobbers'-length drill bits.

Cobalt Steel 1/2" Diameter Reduced-Shank Drill Bit Sets

With better heat and wear resistance than high-speed steel, cobalt steel bits can run up to 25% faster and have a longer tool life.

Hex-Shank Drill Bit Sets

Insert these bits directly into power screwdrivers, impact drivers, and other tools that accept 1/4" hex shanks.

High-Speed Steel 1/2" Diameter
Reduced-Shank Drill Bit Sets

Use these bits for general purpose drilling in most material.

Counterboring

Long-Life Counterboring Drill Bits

Also known as subland drill bits, these last longer than standard counterboring drill bits because the diameter stays the same after sharpening.

Oversized Long-Life Counterboring Drill Bits

Often used with screw holes in misaligned sheets or layers of material.

Counterboring Drill Bits

Often called step drill bits.

Inch Size Drill-Point Counterbores

Drill and counterbore holes with enough clearance for socket head screws without changing tools.

Metric Size Drill-Point Counterbores

The same tool lets you drill and counterbore holes with enough clearance for socket head screws.

Large-Diameter Drill-Bit Counterbores

Also known as multi-spur counterbores, these have two set screws to secure them to a woodworking drill bit.

Drill-Bit Counterbores with Drill Bit

These counterbores are attached to a drill bit for drilling and counterboring in a single step.

Drill-Bit Counterbores

For jobbers’ and brad-point drill bits.

Drill-Bit Counterbore Sets

Convert standard jobbers’ and brad-point drill bits into counterboring drill bits that drill and counterbore at the same time.

Metric Size Drill-Point Counterbore Sets

No need for separate tools, these sets have counterbores in various sizes that drill and counterbore holes with enough clearance for socket head cap screws.

Inch Size Drill-Point Counterbore Sets

Keep counterbores in various sizes on hand to drill and counterbore holes with enough clearance for socket head cap screws without changing tools.

Carbide Drill/Mill End Mills

Made of solid carbide, these end mills are harder, stronger, and more wear resistant than cobalt steel for the longest life and best finish on hard material. A 90° pointed tip allows them to be used for drilling as well as for slotting, profiling, chamfering, and spotting cuts.

Electrical Discharge Machining

Electrical Discharge Machining Tube Electrodes

Create very small holes, including pilot holes to run EDM wire through. For use in hole-popping EDM machines.

Guides for Electrical Discharge
Machining Tube Electrodes

Hold a tube electrode in place as it penetrates the workpiece.

Drill Bit Decimal Size Equivalents

About Drill Bits

Countersinks

High-Speed Steel Drill-PointCountersinks for Lathe Centers

Cobalt Steel Drill-Point Countersinks withTwo Countersinking Ends for Lathe Centers

Cobalt Steel Drill-Point Countersinks for Lathe Centers

Carbide Drill-Point Countersinks for Lathe Centers

Bell-Style Drill-Point Countersinks for Lathe Centers

Radius-Style Drill-Point Countersinks for Lathe Centers

Starter-Hole-Eliminating Drill-Point Countersinkswith Two Countersinking Ends for Lathe Centers

Starter-Hole-Eliminating Drill-PointCountersinks for Lathe Centers

High-Speed Steel Drill-Point Countersinkswith Two Countersinking Ends for Screws

Carbide Drill-Point Countersinks withTwo Countersinking Ends for Screws

High-Speed Steel Drill-Point Countersinks for Screws

High-Speed Steel Starter-Hole-EliminatingDrill-Point Countersinks for Screws

Carbide Starter-Hole-Eliminating Drill-PointCountersinks with Two Countersinking Ends for Screws

Carbide Starter-Hole-Eliminating Drill-PointCountersinks with Two Countersinking Ends for Rivets

High-Speed Steel Starter-Hole-EliminatingDrill-Point Countersinks for Rivets

Countersinking Drill Bits for Screws

Drill-Bit Countersinks with Drill Bit

High-Speed Steel Drill-Bit Countersinks for Screws

Carbon Steel Drill-Bit Countersinks for Screws

Quick-Change CombinationCountersinking Drill and Screwdriver Bits

Countersink Sets

Cobalt Steel Drill-Point CountersinkSets for Lathe Centers

High-Speed Steel Drill-PointCountersink Sets for Lathe Centers

Carbide Drill-Point Countersink Sets for Lathe Centers

High-Speed Steel Drill-PointCountersink Sets for Screws

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

Carbide Drill-Point Countersink Sets withTwo Countersinking Ends for Screws

High-Speed Steel Drill-Bit Countersink Sets

Carbon Steel Drill-Bit Countersink Sets

Quick-Change Combination CountersinkingDrill and Screwdriver Bit Sets

Drill Bits

Drill Bits

Short-Length Drill Bits

Maintenance-Length Drill Bits

Short-Flute Extended-Length Drill Bits

Chip-Clearing Drill Bits

Extended-Length Chip-Clearing Drill Bits

Cobalt Steel Drill Bits

Short-Flute Cobalt Steel Drill Bits

Short-Length Cobalt Steel Drill Bits

Short-Flute Extended-Length Cobalt Steel Drill Bits

Extended-Length Cobalt Steel Drill Bits

Chip-Clearing Cobalt Steel Drill Bits

Carbide Drill Bits

Short-Length Carbide Drill Bits

Smooth-Finish Carbide Drill Bits

Carbide Drill Bits with Coolant Holes

Short-Length Carbide-Tipped Drill Bits

Carbide-Tipped Drill Bits

Short-Flute Extended-Length Carbide-Tipped Drill Bits

Cobalt Steel 1/2" Diameter Reduced-Shank Drill Bits

1/2" Diameter Reduced-Shank Drill Bits

Cobalt Steel 3/4" Diameter Reduced-Shank Drill Bits

3/8" Diameter Reduced-Shank Drill Bits

Cobalt Steel Hex-Shank Drill Bits

Hex-Shank Drill Bits

Cobalt Steel Morse Taper-Shank Drill Bits

Threaded-Shank Drill Bits

Carbide Drill Bits for Hardened Steel

Drill Bits for Sheet Metal

Reversible Drill Bits for Sheet Metal

Drill Bits for Carbon Fiber, Fiberglass, and Graphite

Short-Length Drill Bits for CarbonFiber, Fiberglass, and Graphite

Hex-Shank Masonry Drill Bitsfor Tapping Screw Installation

Cobalt Steel Drill Bits for Stainless Steel and Nickel

Carbide Drill Bits for Stainless Steel and Nickel

Drill Bits for Countersunk Holes

Hex-Shank Drill Bits with Guide for Countersunk Holes

Round-Shank Drill Bits withGuide for Countersunk Holes

Hole-Starting Drill Bits

Carbide Hole-Starting Drill Bits

Cobalt Steel Hole-Starting Drill Bits

Left-Hand Drill Bits

Cobalt Steel Left-Hand Drill Bits

High-Speed Steel Left-Hand Drill Bits

Drill Bits for Spot Welds

Drill Bits for Spot Welds

High-Speed Steel Drill-Point
Countersinks for Lathe Centers

Cobalt Steel Drill-Point Countersinks with
Two Countersinking Ends for Lathe Centers

Starter-Hole-Eliminating Drill-Point Countersinks
with Two Countersinking Ends for Lathe Centers

Starter-Hole-Eliminating Drill-Point
Countersinks for Lathe Centers

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

Carbide Drill-Point Countersinks with
Two Countersinking Ends for Screws

High-Speed Steel Starter-Hole-Eliminating
Drill-Point Countersinks for Screws

Carbide Starter-Hole-Eliminating Drill-Point
Countersinks with Two Countersinking Ends for Screws

Carbide Starter-Hole-Eliminating Drill-Point
Countersinks with Two Countersinking Ends for Rivets

High-Speed Steel Starter-Hole-Eliminating
Drill-Point Countersinks for Rivets

Quick-Change Combination
Countersinking Drill and Screwdriver Bits

Cobalt Steel Drill-Point Countersink
Sets for Lathe Centers

High-Speed Steel Drill-Point
Countersink Sets for Lathe Centers

High-Speed Steel Drill-Point
Countersink Sets for Screws

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

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

Quick-Change Combination Countersinking
Drill and Screwdriver Bit Sets

Short-Length Drill Bits for Carbon
Fiber, Fiberglass, and Graphite

Hex-Shank Masonry Drill Bits
for Tapping Screw Installation

Round-Shank Drill Bits with
Guide for Countersunk Holes

High-Speed Steel 1/2" Diameter
Reduced-Shank Drill Bit Sets

Guides for Electrical Discharge
Machining Tube Electrodes