What’s The Hardest Metal To Drill Through?

Cobalt is the hardest metal to drill through, followed by High-speed steel and Diamond tipped drill bits. Carbide burrs are even harder. For a drill press to pierce steel, you will need a bigger, more powerful drill. But, if you only need to make a small hole, a small drill can do the job with ease.

In this article, we will answer this question and provide a better understanding of which metals are best for drilling.


Steel is among the hardest metals to drill through, and cobalt adds strength and heat resistance to it. Drilling through metal produces high temperatures as friction occurs, and the drill bit may break or be damaged as a result. In addition to being harder than titanium, cobalt is also less malleable. For this reason, cobalt drill bits are more expensive than their steel counterparts.

While titanium-coated bits are recommended for drilling soft materials, such as wood, cobalt bits are better for drilling hard metals like cast iron or titanium. Cobalt drill bits are more expensive than titanium drill bits, but their longer lifespan and greater durability make them worth the extra cost. These bits can also withstand extreme temperatures better than titanium drill bits. However, titanium drill bits are not as hard as cobalt ones, and thus are recommended only for heavy drilling.

The best choice for drill bits made from cobalt is an alloy composed of 5-8% Cobalt blended into the base material. Cobalt drill bits are great for drilling stainless steel and harder steel. Cobalt drill bits also retain their hardness even in high temperatures. High-speed steel is less expensive and more abundant than high-carbon steel. The carbide-tipped drill bit is tough and can withstand high temperatures. Its edge holds its sharpness longer than the cobalt drill bits.

If you are considering drilling through cobalt, you should be aware that they are the hardest metal to drill through. These drill bits usually have split or stepped points, which prevent them from sliding on smooth surfaces. Nevertheless, you should still sharpen cobalt drill bits if they are too dull, or you might end up with a hole you can’t repair. There are four basic tips that you should follow to successfully drill through cobalt.

High-speed steel

High-speed steel is a form of tool-steel that provides exceptional heat-resistance. Its high-speed steel makes it useful for drilling and cutting through hard materials. It is less expensive and available in greater quantities than other steels. High-speed steels are often used for drills in stainless steel. Because of their high hardness, they can be drilled through at higher speeds without losing their sharp edge.

High-speed steel is made from an iron and carbon alloy at a ratio of five percent. It comes in several forms, including tungsten HSS and molybdenum HSS. M42 HSS is the most common, offering superior hardness for operations that tend to chip or burn at the edge. M10 has high wear resistance and is ideal for drilling into thicker material. High-speed steel is also the hardest metal to drill through and machining.

Another hard-metal alloy is cobalt steel. This type of steel provides durable cutting edges, and it is less brittle than high-carbon steel. However, cobalt drill bits are more expensive than HSS, but their durability is better than other drill bits. For example, a set of 100 titanium-coated drill bits will last longer than a set of steel ones. They are also less prone to breakage than the steel counterparts.

Carbide tipped drills are the best option for drilling into hardened steel. The carbide tipped drills will prevent chipping and dissipate heat quickly. This type of drill is also cheap and is best for production drilling and for high-end equipment. For general-purpose drilling, carbide bits are used. For this reason, high-speed steel is the hardest metal to drill through.

Diamond tipped drill bits

When it comes to hardness, diamond tipped drill bits are the most solid. The hardness of diamond is 12-14 times greater than the material being drilled through. Wood and metal, for example, have hardness ratios of eighty to one or two hundred. As a result, diamond drill bits are very hard and require special techniques to drill through them. However, diamond drill bits also have a limited life span when drilling through very hard materials.

Core drilling uses a drill bit with diamonds embedded inside the hole. They are more efficient than blunt-nose bits because diamonds are positioned inside the matrix rather than being exposed outside. This allows them to be more engaged in drilling action. Open-bond designs are also an advantage, as they make the diamond and bond work more efficiently. These drill bits can drill through the hardest metals such as steel, marble, and granite.

In addition to hard metals, diamond tipped drill bits can be used on glass and stained glass. They are also good for drilling ceramics, limestone, granite, and slate. These materials are harder than wood, and drilling them requires more patience than wood and glass. These drill bits will not only cut through the material, but will also grind the hole in the material. They can also cut through metal, such as aluminum or copper.

While diamond is the hardest metal to drill through, there are many other materials that are difficult to penetrate. Using a drill bit that is made from tungsten carbide or diamond can be a better option. They are stronger, but are also brittle, and are less prone to corrosion. If you’re looking for the hardest metal to drill through, choose a diamond-tipped drill bit.

Carbide burrs

Carbide burrs are made of different grades of tungsten. The higher the grade, the more expensive the burr is. The prices also depend on the shape, design, and minimum order. Prices vary widely among suppliers, due to the wide variety in production and demand. Here’s how to find the best carbide burr for your drilling needs:

Carbide burrs are often used in industries requiring intricate alloy files. They’re also safe. Safety is paramount to prevent mishaps. Always insert the shank of the burr properly in the collet. Make sure to use light pressure while clamping. Make sure the burr remains moving while drilling. It’s essential to use a proper burr set to make sure you don’t end up with a damaged drill bit.

Carbide burrs can be used for drilling through a variety of metals. High speed steel begins to soften when exposed to high temperatures, and a carbide burr is tougher and more durable. A high-quality carbide burr can last for decades without breaking. They’re also safer to use than HSS burrs. Carbide burrs are generally made of solid carbide, although some products are cemented. Both carbide and cemented carbide are recyclable materials.

As with all carbide burrs, a proper carbide drill bit is essential for the best results. It will cut through the hardest material with ease. It can also be used for cutting, shaping, and removing burrs and sharp edges. Carbide burrs are the hardest metal to drill through, so choosing the right drill bit is important. So, when in doubt, go for the best!

Titanium nitride coating

Drill bits with titanium nitride coatings last longer than uncoated ones. This coating prevents the drill bit from overheating, and it is more resistant to high temperatures. Drill bits with titanium nitride coatings are best for drilling metals with high hardness, such as steel, aluminum, and stainless steel. They are also faster than uncoated drill bits.

Drill bits with titanium nitride coatings are the hardest metals to drill through. These coatings prevent heat and friction and protect the bit against water and corrosion. These drill bits are available in different quality levels, from high-end drills to inexpensive ones. Titanium nitride drill bits are easily identifiable by their golden color, and they are perfect for high-speed drilling.

While titanium drill bits are the hardest metal to drill through, they are not as hard as diamond bits. Using a diamond drill bit can damage the coating, but titanium bits last longer. Titanium drill bits have a harder coating than cobalt drill bits. But the cost of titanium drill bits is relatively low. They are also much cheaper than cobalt drill bits. Just be sure to check the manufacturer’s warranty before you buy a drill bit, and always remember to replace your drill bit when the coating starts to chip.

Titanium nitride drill bits are made of HSS, a steel alloy, and titanium. These drill bits have a titanium nitride coating that enhances the surface hardness and provides a thermal barrier. Because titanium drill bits have titanium nitride coating, they are resistant to heat and corrosion and last 3 to six times longer than their steel counterparts. These drill bits are best for drilling through metal, aluminum, magnesium, and wood.

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