The Precision Twist CO500-6 extension length drill bit is made of high speed steel (HSS) and cobalt with a gold oxide finish that drills holes into a wide variety of metals and synthetic materials. It can drill to a depth up to four times the diameter of the drill size. The shank diameter is the same as the drill size.
The CO500 series has a type N flute form, with a regular helix (21- to 34-degree) angle, and performs best when drilling into alloy steel, nodular graphite, malleable cast iron, alloyed titanium, or alloyed nickel. While the CO500 series was designed for the aircraft industry, it also works well for drilling into a variety of materials. The extra length and 135-degree split-point drill geometry provide extra reach and ensure a more accurate hole by reducing walking when the hole is started. The gold oxide is a low temperature heat treatment which reduces grinding stress within the tool, and has an appealing, easy-to-identify gold color. The finish retains lubricant to aid in wear resistance and chip flow. Gold oxide is commonly used to identify cobalt steel tools. Spiral flutes act as a passageway for chip extraction from the hole and for coolant to enter the hole. The right-hand twist brings chips up and away from the cutting edge. The extra length allows for more freedom in being able to drill a wider variety of circumstances.
Drilling, or hole making, is the most common metalworking operation in the world. Twist drill bits are the most common type of drill bit used. Twist drill bits can be used in hand-operated drills, standalone drill presses, or a lathe. They are made to ANSI and NAS 907 type J industry standards, which ensure that drill bits around the world conform to the same specifications.