When you shop through links on our site, we may earn an affiliate commission. This educational content is not intended to be a substitute for professional advice.

Taste Stl

20 Best Cobalt Drill Bits For Hardened Steel (2022 Updated)

Cobalt drill bits are made of a high-speed steel alloy with 5-8% cobalt content. They are designed for drilling hard metals, including stainless steel and cast iron, as well as for drilling in high-speed applications. Cobalt drill bits are not suitable for use on soft metals such as aluminum or brass.

20 Best Cobalt Drill Bits For Hardened Steel

Product Image Product Name Features Price

Irwin Bit Drill Cobalt 31/64×5-7/8in

  • 31/64 x 5-7/8 Inch

Irwin Cobalt Steel Drill Bit

  • 23/64″, Cobalt Drill Bit, 135 Degree Split Point To Minimize.
  • Walk”, 8% Cobalt For Higher Heat & Abrasion Resistance, Heavy Duty.

Bosch CO2149 11/32 in. x 4-3/4 in. Cobalt Drill Bit

  • 11/32 Inch X 4-3/4 Inch

Irwin Left-Hand Mechanics Length Cobalt HSS Drill Bits

  • 1/8 Inch

Irwin 19/64in Cobalt Drill Bit

  • 19/64 Inch

Drill America 12-Piece 1/4-in x 12-in Cobalt Twist Drill Bit

  • High-speed steel tools are good for most general purpose applications, offering a combination of hardness and toughness for wear resistance

Qualtech 5/8" Reduced Shank Cobalt Drill Bit, 1/2" Shank, DWDCO5/8

  • High-speed steel tools are good for most general purpose applications, offering a combination of hardness and toughness for wear resistance

#21 Cobalt Jobber Length Drill Bit, Qualtech, Dwdco21, Pack of 12

  • Round shanks allow use with a wide variety of toolholding systems
  • When run in a counterclockwise direction (right-hand cut) spiral fluted tools evacuate chips up and out of the cut to reduce clogging

DeWalt DWA1240 14 Piece Cobalt Drill Bit Set

  • Maximum speed and life in stainless steel and other hard metals
  • Pilot point tip starts on contact for clean, accurate holes and reduces lock-up on breakthrough

Irwin 316015 15-Piece Pro Cobalt Drill Bit Set – Quantity 6

  • Cobalt steel extends cutting edge life and maintains cutting life after resharpening
  • Extra hard drill for greater wear
  • 135-Degree split point tip starts on contact, cuts with less force

Hanson 3018002B Drill Bit Set, Cobalt, 29 Piece

  • These brad point drill bits are excellent for both home repair and woodworking use
  • This product meets customer requirement

Cle-Line C23352 Jobber Drill,11/64",cobalt

  • 11/64

Irwin 10239CB #9 Unibit Cobalt Step Drill

  • 7/8″ and 1-1/8″

Drill America – DWD29J-CO-PC 29 Piece M35 Cobalt Drill Bit Set in Round Case – x

  • Cobalt steel provides extended tool life compared to high-speed steel drill bits when drilling hard materials
  • Gold oxide finish lubricates the drill bit and provides wear resistance

Warrior 61886 115 PC Cobalt Drill Bit Set

  • 115 Pc

Bosch Co21 21-Piece Cobalt Metal Drill Bit Set

  • 21 Pc

9/16" Reduced Shank Cobalt Drill Bit, 1/2" Shank, Drill America

  • Round shanks allow use with a wide variety of toolholding systems
  • When run in a counterclockwise direction (right-hand cut) spiral fluted tools evacuate chips up and out of the cut to reduce clogging

Qualtech DWD115J-CO-SET #1-60, A-Z & 1/16-1/2x64ths 115 Piece Cobalt Drill Bit Set

  • 115 Pc

49/64" Reduced Shank Cobalt Drill Bit, 1/2" Shank, Drill America

  • Material: Cobalt
  • Finish: Gold
  • Flute Length: 3

59/64" Reduced Shank Cobalt Drill Bit, 1/2" Shank, Drill America, D/ACO59/64

  • Other Details
  • Size: 59/64
Irwin Bit Drill Cobalt 31/64×5-7/8in
  • 31/64 x 5-7/8 Inch
Irwin Cobalt Steel Drill Bit
  • 23/64″, Cobalt Drill Bit, 135 Degree Split Point To Minimize.
  • Walk”, 8% Cobalt For Higher Heat & Abrasion Resistance, Heavy Duty.
Bosch CO2149 11/32 in. x 4-3/4 in. Cobalt Drill Bit
  • 11/32 Inch X 4-3/4 Inch
Irwin Left-Hand Mechanics Length Cobalt HSS Drill Bits
  • 1/8 Inch
Irwin 19/64in Cobalt Drill Bit
  • 19/64 Inch
Drill America 12-Piece 1/4-in x 12-in Cobalt Twist Drill Bit
  • High-speed steel tools are good for most general purpose applications, offering a combination of hardness and toughness for wear resistance
Qualtech 5/8" Reduced Shank Cobalt Drill Bit, 1/2" Shank, DWDCO5/8
  • High-speed steel tools are good for most general purpose applications, offering a combination of hardness and toughness for wear resistance
#21 Cobalt Jobber Length Drill Bit, Qualtech, Dwdco21, Pack of 12
  • Round shanks allow use with a wide variety of toolholding systems
  • When run in a counterclockwise direction (right-hand cut) spiral fluted tools evacuate chips up and out of the cut to reduce clogging
DeWalt DWA1240 14 Piece Cobalt Drill Bit Set
  • Maximum speed and life in stainless steel and other hard metals
  • Pilot point tip starts on contact for clean, accurate holes and reduces lock-up on breakthrough
Irwin 316015 15-Piece Pro Cobalt Drill Bit Set – Quantity 6
  • Cobalt steel extends cutting edge life and maintains cutting life after resharpening
  • Extra hard drill for greater wear
  • 135-Degree split point tip starts on contact, cuts with less force
Hanson 3018002B Drill Bit Set, Cobalt, 29 Piece
  • These brad point drill bits are excellent for both home repair and woodworking use
  • This product meets customer requirement
Cle-Line C23352 Jobber Drill,11/64",cobalt
  • 11/64
Irwin 10239CB #9 Unibit Cobalt Step Drill
  • 7/8″ and 1-1/8″
Drill America – DWD29J-CO-PC 29 Piece M35 Cobalt Drill Bit Set in Round Case – x
  • Cobalt steel provides extended tool life compared to high-speed steel drill bits when drilling hard materials
  • Gold oxide finish lubricates the drill bit and provides wear resistance
Warrior 61886 115 PC Cobalt Drill Bit Set
  • 115 Pc
Bosch Co21 21-Piece Cobalt Metal Drill Bit Set
  • 21 Pc
9/16" Reduced Shank Cobalt Drill Bit, 1/2" Shank, Drill America
  • Round shanks allow use with a wide variety of toolholding systems
  • When run in a counterclockwise direction (right-hand cut) spiral fluted tools evacuate chips up and out of the cut to reduce clogging
Qualtech DWD115J-CO-SET #1-60, A-Z & 1/16-1/2x64ths 115 Piece Cobalt Drill Bit Set
  • 115 Pc
49/64" Reduced Shank Cobalt Drill Bit, 1/2" Shank, Drill America
  • Material: Cobalt
  • Finish: Gold
  • Flute Length: 3
59/64" Reduced Shank Cobalt Drill Bit, 1/2" Shank, Drill America, D/ACO59/64
  • Other Details
  • Size: 59/64

1. Irwin Bit Drill Cobalt 31/64×5-7/8in

Irwin Bit Drill Cobalt 31/64x5-7/8in

  • 31/64 x 5-7/8 Inch

Check Latest Price

Sold By Price
Amazon.com
Walmart – Dallas Textile
eBay – contractorstock
PlumbersStock.com

Product Details

Specifications

Reviews From Real Customers

M.
T.
Y.

2. Irwin Cobalt Steel Drill Bit

Irwin Cobalt Steel Drill Bit

  • 23/64″, Cobalt Drill Bit, 135 Degree Split Point To Minimize.
  • Walk”, 8% Cobalt For Higher Heat & Abrasion Resistance, Heavy Duty.
  • Web Construction For Strength & Durability, For Tough Metal.
  • Drilling, Including Heavy Duty Abrasive, Alloy Metal Drilling On.
  • Hardened Steel, Cast Iron & Stainless Steel, Carded.

Check Latest Price

Sold By Price
eBay
Acme Tools
DK Hardware
McGuckin Hardware

Product Details

Specifications

Details
Assembled Weight (lbs) 0.02 lbs
Package Weight 0.02
Package Weight UOM LB
Net Packaged Quantity 1 EA
Bit Material Cobalt

Reviews From Real Customers

M.
T.
Y.

3. Bosch CO2149 11/32 in. x 4-3/4 in. Cobalt Drill Bit

Bosch CO2149 11/32 in. x 4-3/4 in. Cobalt Drill Bit

  • 11/32 Inch X 4-3/4 Inch

Check Latest Price

Sold By Price
Amazon.com
Tool Nut
Opentip.com
ToolOrbit.com

Product Details

Specifications

Details
Bulk false
Diameter 11/32″
Length 4.75″
Overall Length 4.75
Shank Diameter 0.3437

Reviews From Real Customers

JimBuck3
Pitman
buyinsellindealin4

4. Irwin Left-Hand Mechanics Length Cobalt HSS Drill Bits

Irwin Left-Hand Mechanics Length Cobalt HSS Drill Bits

  • 1/8 Inch

Check Latest Price

Sold By Price
Walmart
eBay
NAPA Auto Parts
Penn Tool Co.

Product Details

Specifications

Details
Applicable Materials Metal
Applications Drilling
Country of Origin BR
Cutting Diam 1/8 in
Cutting Diam [Nom] 1/8 in

Reviews From Real Customers

M.
J.D.

5. Irwin 19/64in Cobalt Drill Bit

Irwin 19/64in Cobalt Drill Bit

  • 19/64 Inch

Check Latest Price

Sold By Price
eBay – perrysmart
PlumbersStock.com
MechanicSurplus.com
HardwareAndTools.com

Product Details

Specifications

Details
Diameter 19/64 in
Flute Type Spiral
Point Angle 135 deg
Point Type Split
Cutting Direction Clockwise

Reviews From Real Customers

M.
T.
Y.

6. Drill America 12-Piece 1/4-in x 12-in Cobalt Twist Drill Bit

Drill America 12-Piece 1/4-in x 12-in Cobalt Twist Drill Bit

  • High-speed steel tools are good for most general purpose applications, offering a combination of hardness and toughness for wear resistance
  • Uncoated tools feature just the base substrate without any additional treatment or coatings and are suitable for a wide range of applications
  • Round shank with square end
  • Straight flute tools allow chips to collect in the flutes as they cut and are well suited for most applications in shallow cuts
  • Right-hand cut tools have a cutting action that engages when they are run in a clockwise direction

Check Latest Price

Sold By Price
Amazon.com
Lowe’s

Product Details

Specifications

Details
Shank Size 1/4-in
Shank Type Round
Heavy Duty Yes
Set/Individual Individual
For Use on Fiberglass No

Reviews From Real Customers

bur_877557
kasehunte-8
Janet F.

7. Qualtech 5/8″ Reduced Shank Cobalt Drill Bit, 1/2″ Shank, DWDCO5/8

Qualtech 5/8

  • High-speed steel tools are good for most general purpose applications, offering a combination of hardness and toughness for wear resistance
  • Black oxide treatment adds lubricity and creates small pockets on the surface of the tool that act to hold coolant near the cutting edge
  • Round shanks allow use with a wide variety of toolholding systems
  • When run in a counterclockwise direction (right-hand cut) spiral fluted tools evacuate chips up and out of the cut to reduce clogging
  • Ideal for drilling in low and medium tensile strength materials

Check Latest Price

Sold By Price
Amazon.com
Walmart
eBay
Lowe’s

Product Details

Specifications

Details
Size 5/8″

Reviews From Real Customers

Unknown
David G.
William G.

8. #21 Cobalt Jobber Length Drill Bit, Qualtech, Dwdco21, Pack of 12

#21 Cobalt Jobber Length Drill Bit, Qualtech, Dwdco21, Pack of 12

  • Round shanks allow use with a wide variety of toolholding systems
  • When run in a counterclockwise direction (right-hand cut) spiral fluted tools evacuate chips up and out of the cut to reduce clogging
  • Ideal for drilling in tough, high tensile strength materials

Check Latest Price

Sold By Price
Amazon.com
Walmart
Home Depot
Lowe’s

Product Details

Specifications

Details
Bit Length 3-1/4-in
Shank Size 0.159
For Use on Wood Yes
Package Quantity 12
Right/Left Hand Right handed

Reviews From Real Customers

Unknown
David G.
William G.

9. DeWalt DWA1240 14 Piece Cobalt Drill Bit Set

DeWalt DWA1240 14 Piece Cobalt Drill Bit Set

  • Maximum speed and life in stainless steel and other hard metals
  • Pilot point tip starts on contact for clean, accurate holes and reduces lock-up on breakthrough
  • Industrial strength cobalt for optimum life and durability in metal
  • No bit walking – more user control

Check Latest Price

Sold By Price
Amazon.com
Walmart
Lowe’s
Acme Tools

Product Details

Specifications

Details
Package Weight 0.8 lbs.
Bit Type Set
Bit Material Cobalt
MFG Brand Name DEWALT
Pieces 14.0

Reviews From Real Customers

Michael
Eric Ruble
aman10

10. Irwin 316015 15-Piece Pro Cobalt Drill Bit Set – Quantity 6

Irwin 316015 15-Piece Pro Cobalt Drill Bit Set - Quantity 6

  • Cobalt steel extends cutting edge life and maintains cutting life after resharpening
  • Extra hard drill for greater wear
  • 135-Degree split point tip starts on contact, cuts with less force

Check Latest Price

Sold By Price
Amazon.com

Product Details

Specifications

Details
Finish Type Cobalt Alloy Steel
Cutting Angle String 135 Degrees
Item Dimensions LxWxH 10.25 x 10.94 x 11.06 inches
Tool Flute Type Spiral
Surface Recommendation Alloy Steel,Metal

Reviews From Real Customers

Thomas
J.H.
C.S.

11. Hanson 3018002B Drill Bit Set, Cobalt, 29 Piece

Hanson 3018002B Drill Bit Set, Cobalt, 29 Piece

  • These brad point drill bits are excellent for both home repair and woodworking use
  • This product meets customer requirement
  • Product is easy to use

Check Latest Price

Sold By Price
Amazon.com
Walmart – American Mechanic
Airgas
ToolTopia.com

Product Details

Specifications

Details
Finish Type Titanium
Shank Type Round
Item Dimensions LxWxH 8.25 x 4.63 x 2.75 inches
Tool Flute Type Straight
Surface Recommendation Metal

Reviews From Real Customers

J.H.
W.T.
T.

12. Cle-Line C23352 Jobber Drill,11/64″,cobalt

Cle-Line C23352 Jobber Drill,11/64

  • 11/64

Check Latest Price

Sold By Price
Grainger Industrial Supply
The Woodturning Store
R.S. Hughes
Zoro

Product Details

Specifications

Details
Brand Cle-Line
Surface Finish Straw
Hand of Spiral Right Hand Spiral
Hand of Cut Right Hand Cut
Drill Diameter 11/64 in

Reviews From Real Customers

Ausmus
Grant
Marvin

13. Irwin 10239CB #9 Unibit Cobalt Step Drill

Irwin 10239CB #9 Unibit Cobalt Step Drill

  • 7/8″ and 1-1/8″

Check Latest Price

Sold By Price
Amazon.com
Walmart
eBay
Acme Tools

Product Details

Specifications

Details
Manufacturer Part Number 10239CB
Product Name Drill Bit
Product Type Drill Bit
Product Material High Speed Steel
Weight (Approximate) 2.06 lb

Reviews From Real Customers

B.
Troy
J.A.G.

14. Drill America – DWD29J-CO-PC 29 Piece M35 Cobalt Drill Bit Set in Round Case – x

Drill America - DWD29J-CO-PC 29 Piece M35 Cobalt Drill Bit Set in Round Case - x

  • Cobalt steel provides extended tool life compared to high-speed steel drill bits when drilling hard materials
  • Gold oxide finish lubricates the drill bit and provides wear resistance
  • Self-centering 135-degree split point penetrates hard material without a pilot hole and produces small chips to reduce clogging
  • Meets ANSI specifications

Check Latest Price

Sold By Price
Amazon.com
eBay
Tool Discounter
Newegg.com – BeachAudio

Product Details

Specifications

Details
Cutting Angle 135 degrees
Exterior Finish Gold Oxide
Finish Type Gold Oxide
Hand Orientation Right Hand
Item Shape Round

Reviews From Real Customers

dM
Danny
Harry J.

15. Warrior 61886 115 PC Cobalt Drill Bit Set

Warrior 61886 115 PC Cobalt Drill Bit Set

  • 115 Pc

Check Latest Price

Sold By Price
Harbor Freight Tools

Product Details

Specifications

Reviews From Real Customers

Cxx
Cleophus
DL Shepherd

16. Bosch Co21 21-Piece Cobalt Metal Drill Bit Set

Bosch Co21 21-Piece Cobalt Metal Drill Bit Set

  • 21 Pc

Check Latest Price

Sold By Price
Amazon.com
Tool Nut
ToolUp.com
litvon

Product Details

Specifications

Details
Country of Origin China
Width (inches) 113 mm
Height (inches) 197 mm
Length (inches) 43 mm
Catalog CO21

Reviews From Real Customers

7191beth
jack27
heja_jrh_usjhlh

17. 9/16″ Reduced Shank Cobalt Drill Bit, 1/2″ Shank, Drill America

9/16

  • Round shanks allow use with a wide variety of toolholding systems
  • When run in a counterclockwise direction (right-hand cut) spiral fluted tools evacuate chips up and out of the cut to reduce clogging
  • Manufactured to National Aerospace standard 907

Check Latest Price

Sold By Price
Amazon.com
Walmart
eBay – virventures
Home Depot

Product Details

Specifications

Details
Drill Bit Size 9/16″
Drill Bit Point Angle 135 Degrees
Drill Bit Material Cobalt
Drill Bit Finish Gold
Shank Type Round

Reviews From Real Customers

Bruce R.
Gene P.
Billy D.

18. Qualtech DWD115J-CO-SET #1-60, A-Z & 1/16-1/2x64ths 115 Piece Cobalt Drill Bit Set

Qualtech DWD115J-CO-SET #1-60, A-Z & 1/16-1/2x64ths 115 Piece Cobalt Drill Bit Set

  • 115 Pc

Check Latest Price

Sold By Price
Amazon.com
Tool Discounter
Zoro
Drillsandcutters.com

Product Details

Specifications

Details
Drill Bit Point Angle 135 Degrees
Cutting Direction Right Hand
Number of Pieces 115
Drill Bit Grouping Drill Bit Set
Drill Bit Finish Gold

Reviews From Real Customers

Maxwell T.
Paul R.
Sarek

19. 49/64″ Reduced Shank Cobalt Drill Bit, 1/2″ Shank, Drill America

49/64

  • Material: Cobalt
  • Finish: Gold
  • Flute Length: 3
  • Overall Length: 6
  • Point Type: Split Point

Check Latest Price

Sold By Price
Walmart
Home Depot
Opentip.com
Drillsandcutters.com

Product Details

Specifications

Details
Finish Gold
Flute Length 3
Overall Length 6
Shank Size 1/2
Shank Type Round

Reviews From Real Customers

Bruce R.
Gene P.
Billy D.

20. 59/64″ Reduced Shank Cobalt Drill Bit, 1/2″ Shank, Drill America, D/ACO59/64

59/64

  • Other Details
  • Size: 59/64

Check Latest Price

Sold By Price
Walmart
eBay
Home Depot
Drillsandcutters.com

Product Details

Specifications

Details
Finish Gold
Flute Length 3
Overall Length 6
Shank Size 1/2
Shank Type Round

Reviews From Real Customers

Bruce R.
Gene P.
Billy D.

Conclusion

Cobalt drill bits are ideal for drilling through hardened steel. They are made of a high-speed steel with a 5% to 8% cobalt content, which makes them harder and more wear-resistant than standard high-speed steel drill bits. They also have a higher melting point, so they can withstand the high temperatures that are generated when drilling through hard materials.

Similar Posts

Leave a Reply

Your email address will not be published. Required fields are marked *