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Why Cobalt Drill Bits Are Great for Tough Steel Jobs

When it comes to tackling the most demanding steel projects, the choice of tools can make all the difference between a job well done and one that's fraught with challenges. As someone who's spent years in the trenches of professional trades, I've come to rely on one particular type of tool for these tough scenarios, cobalt drill bits. Here's why these bits are indispensable for anyone working with steel.

Overview of Common Drill Bit Materials

When it comes to drill bits, there's a huge range of materials at our disposal. High-Speed Steel (HSS) and Titanium are familiar sights in any tradesman's kit. However, when the going gets tough, it's Cobalt (Co) drill bits that truly shine. Unlike their counterparts, cobalt drill bits possess a unique blend of strength and resilience perfect for drilling into high-tensile materials.

Cobalt’s Unique Properties

Cobalt drill bits are not your average tool, they're engineered for endurance. With a composition that includes a significant percentage of cobalt alloy, these bits maintain their hardness even under the extreme heat generated by drilling into hard steel. This hardness is crucial for penetrating tough materials without wearing out prematurely.

Cobalt vs. Other Materials for Drilling Steel

While HSS bits might be the go-to for softer metals, and titanium coatings offer a degree of surface hardness and corrosion resistance, neither holds a candle to cobalt when it comes to drilling into hardened or stainless steel. Cobalt bits offer an unparalleled combination of heat resistance and durability, outlasting others and maintaining sharpness over time. This longevity not only makes cobalt bits more cost-effective but also ensures that you can maintain productivity without constant bit changes.

Advantages of Using Cobalt Drill Bits for Steel

1. Enhanced Durability: Cobalt's superior hardness translates to impressive durability. These bits stay sharp longer, making them ideal for repeated use in high-tensile steel applications
2. Heat Resistance: Heat can quickly degrade the quality of a drill bit. Cobalt bits, however, are built to withstand high temperatures, preserving their integrity and performance even in the most intense drilling sessions
3. Versatility: Though we're focusing on steel, it's worth mentioning that cobalt drill bits excel in drilling through other hard materials as well, from cast iron to titanium alloys. This versatility makes them a valuable addition to any toolkit.
4. Precision Drilling: With cobalt drill bits, there's a noticeable difference in the accuracy and cleanliness of the holes drilled. This precision is vital in professional settings where every millimetre counts.


In my own experience, cobalt drill bits have been game-changers for projects involving thick, hard steel. From constructing robust frameworks to installing heavy machinery, these bits have delivered time and again where others fell short. Their ability to cut cleanly through steel without losing their edge means I can trust them to perform every time.

Tips for Selecting and Using Cobalt Drill Bits

Choosing the right cobalt bit involves considering the specific steel you're working with and the project requirements. While these bits represent an investment upfront, their durability and efficiency provide immense value over time. For optimal performance, pair them with appropriate drill speeds and use lubrication to further enhance their lifespan and cutting capabilities.

For Australian tradesmen facing the rigours of steel work, cobalt drill bits aren't just a good choice, they're the best choice. Their unparalleled durability, heat resistance, and versatility make them essential for anyone serious about their craft. Upgrading to cobalt drill bits for steel projects is a decision you won't regret, as their performance speaks for itself.