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Best Cobalt Extra Long Drill Bits of 2026

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Jennifer Fraser

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Cobalt Extra Long Drill Bits are high-quality drill bits designed for drilling through tough materials such as stainless steel, cast iron, and titanium. With their extra-long length, they are ideal for drilling deep holes, and their cobalt construction ensures durability and longevity. These drill bits are suitable for both professional and DIY use, and they come in a variety of sizes to accommodate different drilling needs. If you are looking for reliable and efficient drill bits, Cobalt Extra Long Drill Bits are an excellent choice.

At a Glance: Our Top Picks

6mm x 140mm Flute x 205mm Extra Long Series HSS Cobalt Jobber Drill Bit Cover #TOP 1

6mm x 140mm Flute x 205mm Extra Long Series HSS Cobalt Jobber Drill Bit

9.8
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6mm x 180mm Flute x 260mm Extra Extra Long Series HSS Cobalt Jobber Drill Bit Cover #TOP 2

6mm x 180mm Flute x 260mm Extra Extra Long Series HSS Cobalt Jobber Drill Bit

9.7
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4mm x 120mm Flute x 175mm Extra Long Series HSS Cobalt Jobber Drill Bit Cover #TOP 3

4mm x 120mm Flute x 175mm Extra Long Series HSS Cobalt Jobber Drill Bit

9.5
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Top 10 Cobalt Extra Long Drill Bits

#TOP 1

6mm x 140mm Flute x 205mm Extra Long Series HSS Cobalt Jobber Drill Bit

6mm x 140mm Flute x 205mm Extra Long Series HSS Cobalt Jobber Drill Bit Cover

6mm x 140mm Flute x 205mm Extra Long Series HSS Cobalt Jobber Drill Bit For Stainless Steel, Hard Metals, Aluminium, Cast Iron, Copper. DIN1869 Twist Drill Bit

Features

  • HSS Cobalt Extra Long Series Drill Bits - For Drilling Particularly Tough Or Hard Metal Drilling Applications Such As Stainless Steel, Hardened Metal, Cast Iron, Cr-Ni And Special Acid Resistant Steels. Also Work Very Well On Standard Metals / Steels, RSG, Aluminium, High Temperature Alloy, Titanium Alloy, Non Ferrous Metals, Plastics And Wood.
  • DIN1869 Standard - This Cobalt Drill Bit Is Manufactured To DIN1869 Specifications And Is Dimensionally Precise. These HSSCO HSS Drill Bits Can Be Used In Pillar Drills, Handheld Electric Drills, Battery Powered Drills Etc And Can Also Be Used In CNC Machines
  • Our High-Quality M35 HSS Drill Bits For Metal Offer Exceptional Hardness, Heat Resistance, And Durability. Our 2 Flute Design Is Optimised For Fast Chip Removal And Smooth Cutting. This Extra Long Cobalt Jobber Drill Bit Is Ideal For Professionals, DIY Enthusiasts And Home Improvement Enthusiasts
9.8
FTB Score
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#TOP 2

6mm x 180mm Flute x 260mm Extra Extra Long Series HSS Cobalt Jobber Drill Bit

6mm x 180mm Flute x 260mm Extra Extra Long Series HSS Cobalt Jobber Drill Bit Cover

6mm x 180mm Flute x 260mm Extra Extra Long Series HSS Cobalt Jobber Drill Bit For Stainless Steel, Hard Metals, Aluminium, Cast Iron, Copper. DIN1869-II Twist Drill Bit.

Features

  • HSS Cobalt Extra Extra Long Series Drill Bits - For Drilling Particularly Tough Or Hard Metal Drilling Applications Such As Stainless Steel, Hardened Metal, Cast Iron, Cr-Ni And Special Acid Resistant Steels. Also Work Very Well On Standard Metals / Steels, RSG, Aluminium, High Temperature Alloy, Titanium Alloy, Non Ferrous Metals, Plastics And Wood.
  • DIN1869-2 Standard - This Cobalt Drill Bit Is Manufactured To DIN1869/2 Specifications And Is Dimensionally Precise. These HSSCO HSS Drill Bits Can Be Used In Pillar Drills, Handheld Electric Drills, Battery Powered Drills Etc And Can Also Be Used In CNC Machines
  • Our High-Quality M35 HSS Drill Bits For Metal Offer Exceptional Hardness, Heat Resistance, And Durability. Our 2 Flute Design Is Optimised For Fast Chip Removal And Smooth Cutting. This Extra Long Cobalt Jobber Drill Bit Is Ideal For Professionals, DIY Enthusiasts And Home Improvement Enthusiasts
9.7
FTB Score
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#TOP 3

4mm x 120mm Flute x 175mm Extra Long Series HSS Cobalt Jobber Drill Bit

4mm x 120mm Flute x 175mm Extra Long Series HSS Cobalt Jobber Drill Bit Cover

4mm x 120mm Flute x 175mm Extra Long Series HSS Cobalt Jobber Drill Bit For Stainless Steel, Hard Metals, Aluminium, Cast Iron, Copper. DIN1869 Twist Drill Bit

Features

  • HSS Cobalt Extra Long Series Drill Bits - For Drilling Particularly Tough Or Hard Metal Drilling Applications Such As Stainless Steel, Hardened Metal, Cast Iron, Cr-Ni And Special Acid Resistant Steels. Also Work Very Well On Standard Metals / Steels, RSG, Aluminium, High Temperature Alloy, Titanium Alloy, Non Ferrous Metals, Plastics And Wood.
  • DIN1869 Standard - This Cobalt Drill Bit Is Manufactured To DIN1869 Specifications And Is Dimensionally Precise. These HSSCO HSS Drill Bits Can Be Used In Pillar Drills, Handheld Electric Drills, Battery Powered Drills Etc And Can Also Be Used In CNC Machines
  • Our High-Quality M35 HSS Drill Bits For Metal Offer Exceptional Hardness, Heat Resistance, And Durability. Our 2 Flute Design Is Optimised For Fast Chip Removal And Smooth Cutting. This Extra Long Cobalt Jobber Drill Bit Is Ideal For Professionals, DIY Enthusiasts And Home Improvement Enthusiasts
9.5
FTB Score
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#TOP 4

4mm x 150mm Flute x 220mm Extra Extra Long Series HSS Cobalt Jobber Drill Bit

4mm x 150mm Flute x 220mm Extra Extra Long Series HSS Cobalt Jobber Drill Bit Cover

4mm x 150mm Flute x 220mm Extra Extra Long Series HSS Cobalt Jobber Drill Bit For Stainless Steel, Hard Metals, Aluminium, Cast Iron, Copper. DIN1869-II Twist Drill Bit.

Features

  • HSS Cobalt Extra Extra Long Series Drill Bits - For Drilling Particularly Tough Or Hard Metal Drilling Applications Such As Stainless Steel, Hardened Metal, Cast Iron, Cr-Ni And Special Acid Resistant Steels. Also Work Very Well On Standard Metals / Steels, RSG, Aluminium, High Temperature Alloy, Titanium Alloy, Non Ferrous Metals, Plastics And Wood.
  • DIN1869-2 Standard - This Cobalt Drill Bit Is Manufactured To DIN1869/2 Specifications And Is Dimensionally Precise. These HSSCO HSS Drill Bits Can Be Used In Pillar Drills, Handheld Electric Drills, Battery Powered Drills Etc And Can Also Be Used In CNC Machines
  • Our High-Quality M35 HSS Drill Bits For Metal Offer Exceptional Hardness, Heat Resistance, And Durability. Our 2 Flute Design Is Optimised For Fast Chip Removal And Smooth Cutting. This Extra Long Cobalt Jobber Drill Bit Is Ideal For Professionals, DIY Enthusiasts And Home Improvement Enthusiasts
9.3
FTB Score
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#TOP 5

10mm x 185mm Flute x 265mm Extra Long Series HSS Cobalt Jobber Drill Bit

10mm x 185mm Flute x 265mm Extra Long Series HSS Cobalt Jobber Drill Bit Cover

10mm x 185mm Flute x 265mm Extra Long Series HSS Cobalt Jobber Drill Bit For Stainless Steel, Hard Metals, Aluminium, Cast Iron, Copper. DIN1869 Twist Drill Bit

Features

  • HSS Cobalt Extra Long Series Drill Bits - For Drilling Particularly Tough Or Hard Metal Drilling Applications Such As Stainless Steel, Hardened Metal, Cast Iron, Cr-Ni And Special Acid Resistant Steels. Also Work Very Well On Standard Metals / Steels, RSG, Aluminium, High Temperature Alloy, Titanium Alloy, Non Ferrous Metals, Plastics And Wood.
  • DIN1869 Standard - This Cobalt Drill Bit Is Manufactured To DIN1869 Specifications And Is Dimensionally Precise. These HSSCO HSS Drill Bits Can Be Used In Pillar Drills, Handheld Electric Drills, Battery Powered Drills Etc And Can Also Be Used In CNC Machines
  • Our High-Quality M35 HSS Drill Bits For Metal Offer Exceptional Hardness, Heat Resistance, And Durability. Our 2 Flute Design Is Optimised For Fast Chip Removal And Smooth Cutting. This Extra Long Cobalt Jobber Drill Bit Is Ideal For Professionals, DIY Enthusiasts And Home Improvement Enthusiasts
9.1
FTB Score
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#TOP 6

10mm x 235mm Flute x 340mm Extra Extra Long Series HSS Cobalt Jobber Drill Bit

10mm x 235mm Flute x 340mm Extra Extra Long Series HSS Cobalt Jobber Drill Bit Cover

10mm x 235mm Flute x 340mm Extra Extra Long Series HSS Cobalt Jobber Drill Bit For Stainless Steel, Hard Metals, Aluminium, Cast Iron, Copper. DIN1869-II Twist Drill Bit.

Features

  • HSS Cobalt Extra Extra Long Series Drill Bits - For Drilling Particularly Tough Or Hard Metal Drilling Applications Such As Stainless Steel, Hardened Metal, Cast Iron, Cr-Ni And Special Acid Resistant Steels. Also Work Very Well On Standard Metals / Steels, RSG, Aluminium, High Temperature Alloy, Titanium Alloy, Non Ferrous Metals, Plastics And Wood.
  • DIN1869-2 Standard - This Cobalt Drill Bit Is Manufactured To DIN1869/2 Specifications And Is Dimensionally Precise. These HSSCO HSS Drill Bits Can Be Used In Pillar Drills, Handheld Electric Drills, Battery Powered Drills Etc And Can Also Be Used In CNC Machines
  • Our High-Quality M35 HSS Drill Bits For Metal Offer Exceptional Hardness, Heat Resistance, And Durability. Our 2 Flute Design Is Optimised For Fast Chip Removal And Smooth Cutting. This Extra Long Cobalt Jobber Drill Bit Is Ideal For Professionals, DIY Enthusiasts And Home Improvement Enthusiasts
9.0
FTB Score
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#TOP 7

1/16 Inch x 6 Inch Aircraft Drill Bit Extra Long Black Oxide Cobalt Extension Bit

  • Narwhal
  • 810147653577
  • 1/16" x 6"
1/16 Inch x 6 Inch Aircraft Drill Bit Extra Long Black Oxide Cobalt Extension Bit Cover

1/16 Inch x 6 Inch Aircraft Drill Bit (Professional Grade 6 Pack) Extra Long Black Oxide Cobalt Extension Bit - Perfect for Drilling into Sheet Metal, Stainless, Aluminum, Wood, & Copper

Features

  • BLACK OXIDE COATING & 135°SPLIT POINT - Designed To Resist Rust & Corrosion & Last 50% Longer Than Standard HSS Bits. 135° Split Point Design Makes It Easier To Drill Repeated Holes In Harder Materials.
  • 6 Pack Of 1/16" X 6" AIRCRAFT DRILL BITS - 1/16 Inch Cutting Diameter With 7/8 Inch Flute & Total Length Of 6 Inches.
  • PLASTIC STORAGE CASE INCLUDED - Incredibly Tough And Durable Plastic Case. Perfect For Keeping Your Cobalt Drill Bits Neatly Organized And Safe.
9.0
FTB Score
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#TOP 8

HLOFIZI 9/64 x 12 Inch Cobalt Long Drill Bits

  • HLOFIZI
  • 3FLAT964X12P2BGM35
  • 9/64"
HLOFIZI 9/64 x 12 Inch Cobalt Long Drill Bits Cover

HLOFIZI 9/64 x 12 Inch Cobalt Long Drill Bits (2 Pack), Drilling for Hard Wood, Aluminum, and Soft Metal Sheet

Features

  • Longer Life: Made Of M35 Cobalt High Speed Steel, Provide Durability And Resisting Breakage. Premium Coating For High-Heat Resistant And Rust Protection
  • Cobalt Long Drill Bits: 2-Piece Of 9/64” X 12” Drill Bits. Ideal For Drilling Hard Wood, Plastic, Aluminum And Soft Metal
  • Prevent Walking: 135 Degrees Split Point For Precision Start NO WALKING, And Stays Sharper Longer
8.9
FTB Score
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#TOP 9

HLOFIZI 3/8 x 12 Inch Cobalt Long Drill Bits

  • HLOFIZI
  • 3FLAT38X12P1BGM35
HLOFIZI 3/8 x 12 Inch Cobalt Long Drill Bits Cover

HLOFIZI 3/8 x 12 Inch Cobalt Long Drill Bits (1 Pack), Drilling for Hard Wood, Aluminum, and Soft Metal Sheet

Features

  • Longer Life: Made Of M35 Cobalt High Speed Steel, Provide Durability And Resisting Breakage. Premium Coating For High-Heat Resistant And Rust Protection
  • Cobalt Long Drill Bits: 1-Piece Of 3/8” X 12” Drill Bits. Ideal For Drilling Hard Wood, Plastic, Aluminum And Soft Metal
  • Prevent Walking: 135 Degrees Split Point For Precision Start NO WALKING, And Stays Sharper Longer
8.9
FTB Score
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#TOP 10 Best Extra Long Drill Bit for Metal

sourcing map HSS Extra Long Twist Drill Bits

sourcing map HSS Extra Long Twist Drill Bits Cover

sourcing map HSS(High Speed Steel) Extra Long Twist Drill Bits, 4mm Drill Diameter 160mm Length for Hardened Metal Woodwork Plastic Aluminum Alloy 2 Pcs

The sourcing map Twist Drill Bits are designed for precision and durability. With a diameter of 4mm and a length of 160mm, these high-speed steel bits are ideal for drilling through non-ferrous metals, hard plastics, and more. Their twisted design enhances cutting accuracy, ensuring the drill bit stays centred and reduces displacement during use. Additionally, the high strength and hardness of the material contribute to a longer drilling life, making these bits a reliable choice for both professional and DIY projects.

8.9
FTB Score
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What We Like

  • High-speed steel construction
  • Improved cutting accuracy
  • Suitable for various materials
  • Longer drilling life
  • Works with multiple drill types

Frequently Asked Questions (FAQs)

1. What is stronger than a cobalt drill bit?

Titanium drill bits are harder than cobalt, but because they are coated, they can't be sharpened. Cobalt drill bits are made of cobalt steel, and they can be sharpened. They are also highly resistant to heat and are very hard and abrasive.

2. Is titanium or cobalt better for drill bits?

Cobalt drill bits are more expensive, but offer longer life, and are more resistant to heat than titanium drill bits. Cobalt drill bits are also tougher and can drill holes in the hardest metals. Here is a quick comparison chart that explains the key differences between titanium vs cobalt drill bits.

3. Are cobalt drill bits worth it?

Cobalt drill bits are incredibly strong. They can be operated at much higher speeds than a standard HSS drill bit. The ability to withstand heat means that cobalt bits perform for long periods without cooling or the need for cutting fluid. They are most often used to cut through hardened and abrasive materials.

4. What is difference between M35 and M42 cobalt?

A: M35 and M42 refer to the percentage of cobalt in the cobalt steel alloy. M35 is five percent cobalt whereas M42 has eight percent.

Editor's Notes

During our cobalt extra long drill bit research, we found 46 cobalt extra long drill bit products and shortlisted 10 quality products. We collected and analyzed 2,851 customer reviews through our big data system to write the cobalt extra long drill bits list. We found that most customers choose cobalt extra long drill bits with an average price of £20.00.

The cobalt extra long drill bits are available for purchase. We have researched hundreds of brands and picked the top brands of cobalt extra long drill bits, including Rennie Tool Company, Narwhal, HLOFIZI, sourcing map.

Written by

Jennifer Fraser Avatar

Jennifer Fraser

Jennifer Fraser is a licensed contractor specializing in sales, maintenance, and kitchen, bathroom, and home appliances, tools, and utilities. She owns a store in Leeds where you can get any home and tool appliance. Jenny has a degree in literature, but she combines her knowledge and experience with her degree to publish DIY articles on solving home appliances issues to keep up the family enterprise.