Precision Twist 2ACO 5mm Bronze Cobalt Jobber Drill 135 Degree Split Point Type J NAS907 016450

The Precision Twist R10CO, R15CO, R18CO and 2ACO jobber-length drill bits are a 135-degree, spilt-point, heavy-duty, round shank drill bit made of HSS and cobalt with a bronze oxide finish. For best performance, use for drilling into hardened, tempered alloy steel, nodular graphite malleable cast iron, titanium, and alloyed nickel. It is suitable for drilling to a depth up to four times the diameter of the drill. The shank diameter is the same as the drill size. While this series was designed for the aircraft industry, it also works well for drilling into a variety of materials. The jobber length and 135-degree split-point drill geometry provide good reach and ensure a more accurate hole by reducing walking when the hole is started. The finish retains lubricant to aid in wear resistance and chip flow. The R10CO series has a type N flute form (a regular helix angle of 21 to 34 degrees). Made of HSS with cobalt with bronze oxide finish, is many times harder/stiffer than HSS, will hold an edge longer, and will deflect less than HSS. Provides wear resistance and lubricity.  More resistant to heat than HSS. These qualities allow it to run at higher speeds and feeds.