Premium Cobalt Stub Drill Bits for Heavy Duty Use (Pack of 12)

The Drill America D/ASTCO series cobalt steel screw machine length drill bit is manufactured to the National Aerospace Standard 907. The 135-degree split point is self-centering and reduces thrust, making it ideal for both portable and machine drilling applications. The short, rugged construction of this drill bit allows it to perform well in high tensile strength materials like PH stainless steel, inconel, and titanium.

Cobalt steel tools are similar to high-speed steel, but with a higher cobalt content, which improves their performance when cutting harder metals such as stainless steel or nickel alloys. The gold oxide surface treatment used on these tools is thinner than the more common black oxide, but it provides similar performance to uncoated tools.

The round shanks of the Drill America D/ASTCO series drill bits allow them to be used with a wide variety of toolholding systems. When run in a counterclockwise direction (right-hand cut), the spiral fluted design of these tools helps to evacuate chips up and out of the cut, reducing the risk of clogging.

Overall, the Drill America D/ASTCO series cobalt steel screw machine length drill bits are a versatile and durable option for both portable and machine drilling applications, particularly when working with high tensile strength materials like stainless steel, inconel, and titanium.

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