Drill America D/ACO29P12 #29 Cobalt Heavy Duty Drill Bits (Pack of 12)

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

Cobalt steel tools share similarities with high-speed steel, but with increased cobalt content for improved performance when cutting harder metals such as stainless steel or nickel alloys. Gold oxide is a thinner oxide surface treatment than black oxide, typically used to identify cobalt steel tools. The performance of gold oxide-treated tools is comparable to that of uncoated tools.

The round shanks of these drill bits allow for use with a wide variety of toolholding systems. When run in a counterclockwise direction (right-hand cut), the spiral fluted tools evacuate chips up and out of the cut, reducing the risk of clogging.

Manufactured to the exacting standards of National Aerospace standard 907, these premium quality drill bits deliver exceptional performance and durability for demanding industrial and aerospace applications.

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