Precision Twist 2ACO Cobalt Steel Jobber Drill Bit, Bronze Oxide Finish, Round Shank, Spiral Flute, 135 Degree Point Angle, 5.00mm (Pack of 12)

The Precision Twist 2ACO jobber-length drill bit is a 135-degree, split-point, heavy-duty, round shank drill bit made of HSS and cobalt with a bronze oxide finish. They meet NAS 907 Type J aircraft industry specifications for heat resistance and use for drilling hard, tough materials. Best performance with drilling into hardened, tempered alloy steel, nodular graphite malleable cast iron, and alloyed titanium and 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 the 2ACO series was designed for aircraft industry, they also work well for drilling into a variety of materials. The 135-degree split-point drill geometry ensure an accurate hole by reducing walking when the hole is started. The finish retains lubricants to aid in wear resistance and chip flow. The 2ACO series has a type N flute form, with a regular helix angle of 21 to 34 degrees. The bronze oxide is a low temperature heat treatment which reduces grinding stress within the tool, and has an appealing, easy-to-identify bronze color. Bronze 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. Right-hand twist brings chips up and away from the cutting edge. 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 are commonly used to drill holes with hand-operated drills, standalone drill presses, or lathes. The flutes of the drill bit act a passageway for chip extraction from the hole and for coolant to enter the hole. These drill bits have a right-hand twist that brings chips up and away from the cutting edge. They are made to DIN 338 and NAS 907 industry standards, which help ensure that drill bits around the world conform to the same specifications. Dormer Pramet manufactures cutting tools under the following brands: Precision Twist Drill, Dormer, Union Butterfield and Pramet. The company has locations around the world, and provides tools adhering to ANSI, NAS, and DIN standards.

• NAS 907 type B standards, used in the aerospace industry
• High-speed steel (HSS) containing cobalt is a good combination of toughness and hardness, for use on drilling through hard substances
• Gold oxide retains cutting fluid and prevents chip to tool welding
• 135-degree split-point angle is self-centering, reduces walking, good for hard material, and reduces pressure on cutting edges
• Jobber-length drill bits, most common length drill bit, suitable for a wide range of applications