Drill America D/ASTCO1/4P12 1/4 Cobalt Heavy Duty Split Point Stub Drill Bit (Pack of 12), D/ASTCO Series 1/4 Cobalt Heavy Duty Split Point Stub Drill Bits, D/ASTCO Series, Pack of 12

The Drill America D/ASTCO series cobalt steel screw machine length drill bit is manufactured to the National Aerospace Standard 907. Its 135-degree split point design 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 such as PH stainless steel, Inconel, and titanium.

Cobalt steel tools, similar to high-speed steel, contain more cobalt for improved performance when cutting harder metals like stainless steel or nickel alloys. The gold oxide surface treatment used to identify these cobalt steel tools is thinner than the more commonly used black oxide, but the performance of the two is similar to that of uncoated tools.

The round shanks of these drill bits allow them to be used with a wide variety of toolholding systems, ensuring versatility and compatibility across different drilling applications. When run in a counterclockwise direction (right-hand cut), the spiral fluted design of the drill bits 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 well-suited for both portable and machine drilling, thanks to their self-centering design, rugged construction, and optimized performance in high-tensile-strength materials. The use of cobalt steel and the gold oxide surface treatment further enhance the capabilities of these drill bits, making them a reliable choice for demanding drilling tasks.

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