Best Steel Cutting Drill Bits- Detailed Buying Guide

FACTS CHECKED BY  NICOLE PAV 

Using quality drill bits while cutting through steel is essential for productive and satisfactory work. Many drill bits are available today, making it a daunting task to choose the correct one.

Whether you’re a professional or DIY enthusiast, we can assist you in identifying the ideal drill bit for your project.

This article reviews some of the best steel-cutting drill bits and factors to consider before buying them.

Table of Contents

Top Three Best Steel Cutting Drill Bits Recommendations

COMOWARE Cobalt Drill Bit Set

BOSCH CO21B 21 Pc. Cobalt M42 Drill Bit Set

BOSCH CO21B 21 Pc. Cobalt M42 Drill Bit Set

CO-Z Step Drill Bits

CO-Z Step Drill Bits

Factors to Consider When Choosing the Best Best Steel Cutting Drill Bits

Material

The choice of the material determines the drill bit’s durability, endurance, and ability to maintain a sharp edge. Some of the materials used for drill construction include:

  • High-Speed Steel (HSS): HSS is an excellent choice due to its durability, ability to withstand high temperatures, and ability to maintain a sharper edge.
  • Cobalt: This material is more heat-resistant and durable than HSS, but it’s more expensive.
  • Carbide: Their extremely hard construction makes them resistant to wear and tear, maintaining the bit’s sharpness. Useful for industrial or commercial drilling and applications that require enhanced precision.

Coating

Drill bit coatings help the bit perform better and last longer. Some of the coatings available include:

  • Titanium nitride: The coating has exceptional heat resistivity and durability, which help extend its lifespan and improve its cutting efficiency.
  • Titanium aluminum nitride: This coating offers excellent heat endurance and the ability to minimize friction, contributing to the bit’s longevity and performance.
  • Black oxide: This is a protective layer on most steel drill bit surfaces to offer corrosion protection, ensuring proper functioning and longevity.

Shank Design

The shank of a drill bit refers to the section that the drill’s chuck holds. When choosing a drill bit, consider the design depending on usage, precision level, and torque needed.

  • Hex pattern: The design features six flat surfaces giving a firm grip in the drill’s chuck to avoid sliding. This is crucial when handling tough materials under high-torque conditions.
  • No-spin shank: It features grooves that grasp and hold the bit firmly in place, preventing it from spinning or rotating. This helps increase the drilling operation’s control, precision, and durability.
Hexagonal shank design

Hexagonal shank design

Number

The number helps identify the size of the bit, usually calibrated in inches or millimeters. For instance, a drill bit size of 3/16″ is bigger than 1/16″.

Various drill bit sizes

Various drill bit sizes

Best Steel Cutting Drill Bits

COMOWARE Cobalt Drill Bit Set

The product comprises 115 drill bits made from M35 cobalt HSS.

Pros

  • Suitable for hardened materials like cast Iron, steel, aluminum, and plastic
  • Resistant to high heat and abrasion
  • It comes in different sizes
  • Allows for a clean drilling

Cons

  • May lack enhanced grip, causing snapping
  • The casing may break easily

Customer review

These are excellent and durable drill bits that cut steel fast and precisely. They also withstand heat and abrasion.

BOSCH CO21B 21 Pc. Cobalt M42 Drill Bit Set

BOSCH CO21B 21 Pc. Cobalt M42 Drill Bit Set

The enhanced Bosch Cobalt M42 bits incorporate 8% cobalt alloy to boost longevity and high-temperature resistance. This makes them ideal for steel, iron, titanium, and aluminum use.

Pros

  • Thick web-helix design for stability
  • Suitable for tough applications
  • Penetrates tough, abrasive materials easily
  • Removes drilling waste faster
  • No skate tips to ensure accuracy

Cons

  • Lacks size calibrations
  • Not suitable for thick metal

Customer review

Bosch is a reputable brand, and their drill sets were quality and worked perfectly on my steel projects.

CO-Z Step Drill Bits

CO-Z Step Drill Bits

Consider the CO-Z Step Drill Bits if you seek a sturdy, sharp, and adaptable drill bit. With cobalt HSS construction and titanium coating, these bits can stay shiny and sharp for years.

Pros

  • Compatible with a variety of chuck sizes
  • Can drill different size hole
  • Can work on a variety of surfaces
  • Provides smooth and fast drilling
  • Extremely durable
  • It comes in a casing for easy transportation and storage

Cons

  • It may not be suitable for highly thick metal
  • It may not work perfectly on commercial projects

Customer review

I used this quality tool to make holes in my trailer to fit some lights, and it worked perfectly.

Metric M42 Cobalt Twist Drill Bits

Metric M42 Cobalt Twist Drill Bits

For individuals wishing to cut into hard steel and alloys, the Metric M42 Drill Bits Set is a quality option. Their construction features an M42 8% cobalt steel with a Rockwell hardness of 68-70, making them incredibly powerful.

Pros

  • Allows for faster drilling
  • Extremely durable
  • It comes in different sizes
  • Perfect for professionals and DIY enthusiasts
  • Maintains sharpness for long

Cons

  • It’s expensive
  • They are prone to chipping

Customer review

I bought this drill bit set, and I’m amazed by its quality, durability, and flexibility.

COMOWARE Step Drill Bit Set

COMOWARE Step Drill Bit Set

The COMOWARE Step Drill Bit Set is an excellent option if you seek durable, precise drill bits. The set construction features high-speed steel with a titanium coating to increase its sharpness and endurance.

Pros

  • Lowers friction that generates heat
  • It comes as a set of 5 bits for drilling holes of varying diameters, 
  • A versatile option for various projects. 
  • Resistant to wear
  • Ensures easier particle removal for a clean drilling operation

Cons

  • It may not be suitable for drilling thick steel
  • It may have a low drilling speed

Customer review

I highly recommend these drill bits to everyone searching for reliable and quality ones.

Conclusion

Consider the carefully selected list above when purchasing the best steel-cutting drill bits for your project.

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