Drill America D/AST Series 3/16 High Speed Steel Heavy Duty Split Point Stub Drill Bit (Pack of 12)

The Drill America D/AST series High-Speed Steel screw machine length drill bits are manufactured to the National Aerospace Standard 907. They feature a 135-degree split point that is self-centering and reduces thrust, making them ideal for both portable and machine drilling applications.

These rugged, short-construction drill bits are well-suited for a broad range of materials in the iron and steel families. They are particularly popular in the automotive and construction industries, where they are often used in screw machine setups with limited spindle clearance.

High-speed steel tools, such as those in the D/AST series, offer a combination of hardness and toughness that makes them suitable for a wide range of general-purpose applications. The black oxide treatment applied to these drill bits adds lubricity and creates small pockets on the surface of the tool that help to hold coolant near the cutting edge, further enhancing their performance.

The round shanks of these drill bits allow them to be used with a variety of toolholding systems, increasing their versatility. When operated in a counterclockwise (right-hand cut) direction, the spiral flutes on the drill bits help to evacuate chips up and out of the cut, reducing the risk of clogging.

Overall, the Drill America D/AST series High-Speed Steel screw machine length drill bits are a durable and capable choice for a wide range of drilling applications, offering a balance of hardness, toughness, and functionality that makes them well-suited for use in both portable and machine-based drilling operations.

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