Drill America 29 Piece m35 Cobalt Drill Bit Set (1/16 - 1/2 x 64ths), DWDCO Series

The Drill America Qualtech 29-piece 135-degree split point heavy-duty drill bit set, manufactured to the National Aerospace Standard 907, is housed in a metal case. These cobalt steel drill bits, made to withstand heat, exhibit higher red hardness, enabling speeds up to 30% greater than high-speed steel drills. They are particularly effective in drilling tough, high-tensile-strength materials such as PH stainless steel, Inconel, and titanium.

The drill bits are self-centering and reduce thrust, with sizes smaller than 1/16-inch featuring the standard 118-degree point. Cobalt steel tools, similar to high-speed steel, have a higher cobalt content for improved performance when cutting harder metals like stainless steel or nickel alloys. The gold oxide surface treatment is a thinner oxide coating than the typical black oxide, providing comparable performance to uncoated tools.

The round shanks of these drill bits allow for use with a wide range of tool-holding systems. When operated in a counterclockwise (right-hand cut) direction, the spiral-fluted design evacuates chips up and out of the cut, reducing clogging. The set includes fractional sizes from 1/16-inch to 1/2-inch, with 1/64-inch increments.

Compared to high-speed steel drill bits, the cobalt steel construction offers extended tool life when drilling hard materials. The gold oxide finish lubricates the drill bit and provides wear resistance. The self-centering 135-degree split point allows for penetration into hard materials without the need for a pilot hole, producing small chips to further reduce clogging.

This drill bit set meets the ANSI specifications, ensuring quality and performance standards. The combination of advanced materials, heat-resistant properties, and specialized design features make this Drill America Qualtech set a reliable choice for demanding drilling applications.

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