Drill Bit Set (Pack of 12), D/ACO Series

The Drill America D/ACO series premium quality heavy duty jobber length drill bit is manufactured to the National Aerospace standard 907. It is made of heat-resistant cobalt steel, which displays higher red hardness, allowing it to operate at speeds up to 30 percent greater than High-Speed Steel drills. This drill bit is particularly effective in drilling tough, high tensile strength materials like PH stainless steel, inconel, and titanium.

Cobalt steel tools are similar to high-speed steel, but with more cobalt added to improve performance when cutting harder metals such as stainless steel or nickel alloys. The gold oxide surface treatment used on these tools is a thinner oxide finish compared to the typical black oxide, and it serves to identify the cobalt steel composition. The performance of these coated tools is similar to that of uncoated tools.

The round shanks of these drill bits allow for use with a wide variety of toolholding systems, providing greater flexibility in application. 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.

In summary, the Drill America D/ACO series premium quality heavy duty jobber length drill bits are engineered to excel in drilling challenging materials, thanks to their cobalt steel construction, heat resistance, and enhanced performance capabilities. The gold oxide surface treatment and round shanks further contribute to the versatility and efficiency of these drill bits, making them a valuable tool for a variety of industrial and manufacturing applications.

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