Precision Twist M51CO 3/16 Bronze Cobalt Taper Length Drill 135 Degree Split Point 051312

The Precision Twist M51CO and M52CO taper-length drill bits are a 135-degree, spilt-point, heavy-duty, round shank drill bit.  They are made of high-speed steel and cobalt with a gold/bronze oxide finish. Used with a wide variety of materials, it is suitable for drilling to a depth up to six times the diameter of the drill. The shank diameter is the same as the drill size. The series has a type N flute form (a regular helix angle of 21 to 34 degrees). 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. Gold oxide is commonly used to identify cobalt steel tools. Made of HSS with cobalt, which is many times harder/stiffer than HSS, will hold an edge longer, and will deflect less than HSS. These are also more resistant to heat than HSS. These qualities allow it to run at higher speeds and feeds. They are made to ANSI (fractional sizing) industry standards, which ensure that drill bits around the world conform to the same specifications.