If you’re looking for a tool to cut through hardened steel, check out the cobalt drill bit sets at Drill Bit Warehouse. Our premium M42 drill bits come in various lengths to suit your project needs. Shop with us today for high-performance drill bits.

The titanium nitride coating has a dark gold appearance, improves wear resistance, and reduces friction. Since the titanium nitride is just a coating, once your drill bit wears down, you cannot resharpen it and maintain its performance level. The titanium layer will no longer be on the drill bit except in the fluting and perhaps on the sides.

Cobalt drill bits are often the best for drilling into hardened steel. Whereas titanium drill bits only have titanium in the coating, cobalt bits have cobalt throughout. After cobalt drill bits get worn out over time, you can resharpen them.

Drill Bit sizechart for Taps

The metric sizes are dispersed throughout. All of these drill bits are different in size except for the 90 and .22mm which are both 0.0087 inches in diameter, the 85 and the .28mm which are both 0.0110 inches in diameter, the 13 and the 4.7mm which are both 0.1850 inches in diameter, the 4.8mm and the 12 which are both 0.1890 inches in diameter, and the 1/4 inch and letter E bits which are both 0.250 inches in diameter.

These drill bits can be tungsten carbide tipped or full body. Carbide-tipped bits can drill through hard, non-metallic materials like masonry. If you want to drill hardened steel with tungsten carbide, use a full-body bit.

Standarddrill bitsizes in mm

Cobalt drill bits contain an alloy of five to eight percent cobalt. M35 bits contain approximately five percent cobalt, and M42 bits contain about eight percent cobalt.

Hardened steel is medium- or high-carbon steel that has been given heat treatment, rapidly cooled and tempered. The high amount of carbon in the steel makes it possible to harden the metal.

Drill bit sizechart

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Letterdrillsizes

The fractions range from 1/64 inch to 32/64 inch. The numbers range from 107 (smallest) to 1 (largest). Where the number 1 drill bit leaves off the letter A (smallest) begins and continues through the letter Z (largest).

Wooddrill bitsizes

Titanium drill bits are one option for drilling hardened steel. These drill bits are high-speed steel bits coated with titanium nitride. High-speed steel bits that consist of vanadium and tungsten can drill through soft steel, but they won’t cut through hardened steel.

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Numberdrillsizes

Sandvik Coromant 5724408 T-Max® P Turning Insert, ANSI Code: CNMG 432-MR 2025, CNMG Insert, Material Grade: M, 432 Insert, Rhombic Shape, 12 Seat, Negative Rake ...

Hardened steel is resistant to wear and high-impact pressure, making it a choice material for applications that require hard-wearing materials. These characteristics can also make it challenging to machine hardened steel. Read on to discover the best drill bits for drilling into hardened steel.

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Standarddrill bitsizes in mm PDF

Drill bits from zero to one half inch are sized in four ways; fractions, wire gauge numbers, letters, and metric in millimeters. You will see drill bits with a fraction, number, letter or metric number stamped on their shank indicating their size.

The cutting speed formula is same for turning and milling. Here they are, for turning and milling. For both Metric and Inch mode.

Drill bit sizeChart PDF

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to wander or move around aimlessly within a small area. Everyone was milling around, looking for something to do. The students milled about between classes.

The more cobalt the bit contains, the harder the metal it can drill through. But the tradeoff is that increasing the cobalt increases the drill bit’s brittleness. Be sure to use the appropriate drilling techniques to preserve your cutting tools.

Carbide is a compound composed of carbon and a metal. Carbide drill bits are tungsten carbide and can contain cobalt for enhanced durability. Carbide drill bits can handle higher temperatures than cobalt drill bits.