Drill America D/AST3/16P12 3/16 High Speed Steel Heavy Duty Split Point Stub Drill Bit (Pack of 12), D/AST Series D/AST Series 3/16 High Speed Steel Heavy Duty Stub Drill Bits, Pack of 12

The Drill America D/AST series High-Speed Steel screw machine length drill bit is manufactured to National Aerospace Standard 907. This drill bit features a 135-degree split point that 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 a broad range of materials in the iron and steel families.

Screw machine drills are widely used in the automotive and construction industries, particularly in screw machine setups where spindle clearance is limited. High-speed steel tools, such as this drill bit, are well-suited for most general-purpose applications, offering a combination of hardness and toughness for wear resistance.

The black oxide treatment applied to this drill bit adds lubricity and creates small pockets on the surface of the tool that act to hold coolant near the cutting edge, enhancing its performance. The round shanks of the drill bit allow it to be used with a wide variety of toolholding systems, providing users with greater flexibility.

When run in a counterclockwise direction (right-hand cut), the spiral fluted design of the drill bit helps to evacuate chips up and out of the cut, reducing the risk of clogging. This feature, combined with the drill bit's self-centering and reduced thrust characteristics, makes it an ideal choice for both portable and machine drilling applications.

In summary, the Drill America D/AST series High-Speed Steel screw machine length drill bit is a versatile and durable tool that is well-suited for a variety of drilling tasks in the iron and steel families. Its design features, including the black oxide treatment, round shanks, and spiral fluted construction, contribute to its overall performance and make it a popular choice in the automotive and construction industries.

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