Drill America 60-Piece m42 Cobalt Screw Machine Drill Bit Set (Wire Sizes: #1 - #60), D/ASTCO Series

The Drill America 60-piece 135-degree split point heavy-duty drill bit set, manufactured to the National Aerospace Standard 907, is designed for optimal performance in a wide range of materials, including the iron and steel families. These self-centering drills feature a short, rugged construction that helps reduce thrust, making them ideal for both portable and machine drilling applications.

Screw machine drills are particularly popular in the automotive and construction industries, as they are often used in screw machine set-ups where spindle clearance is limited. Sizes smaller than #52 have the standard 118-degree point, while cobalt steel tools offer enhanced performance when cutting harder metals, such as stainless steel or nickel alloys.

The gold oxide surface treatment used on these cobalt steel tools is a thinner oxide layer compared to the more commonly used black oxide. This treatment provides similar performance to uncoated tools, but with the added benefit of easier identification.

The round shanks of these drill bits allow for use with a wide variety of toolholding systems, ensuring versatility and compatibility across various machine setups. When run in a counterclockwise direction (right-hand cut), the spiral flutes on these tools effectively evacuate chips up and out of the cut, reducing the risk of clogging and improving the overall drilling efficiency.

The 60-piece drill bit set comes conveniently packaged in a durable metal case, making it an ideal choice for workshops, job sites, or any environment where a comprehensive and well-organized set of high-quality drill bits is required. The combination of the 135-degree split point, cobalt steel construction, and thoughtful design features make this Drill America set a reliable and versatile solution for a wide range of drilling applications.

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