Dormer A0227/64 Screw Machine Drill, Bright/TiN Coating, High Speed Steel, Head Diameter 0.1094", Flute Length 22 mm, Full Length 47 mm (Pack of 10)
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The Dormer A022 stub-length, TiN-tipped, general-purpose, round-shank drill bit drills holes into a wide variety of metals and synthetic materials. It can drill to a depth up to two-and-a-half times the diameter of the drill size. The shank diameter is the same as the drill size.
The A022 series has a type N flute form, with a regular helix (21 to 34 degrees) angle, and are most suitable for drilling into steel, cast iron, and aluminum magnesium. The TiN finish is a gold-colored ceramic coating that is hard and has low friction, permitting faster cutting speeds than uncoated materials. Drill bit sizes less than 2.00 mm/0.0787 inch only have an uncoated finish. The short-stub length has more rigidity for drilling straighter, shallower holes than Jobber-length bits.
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. The 135-degree split-point angles are self-centering and reduce walking of the drill point, leading to more accurate holes.
Drilling, or hole making, is the most common metalworking operation in the world and twist drill bits are the most common type of drill bit. They can be used in hand-operated drills, standalone drill presses, or a lathe. The flutes of the drill bit act as 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 the chips up and away from the cutting edge. They are made to DIN 340 industry standards, which ensure that drill bits around the world conform to the same specifications.
Together, the Precision Twist and Dormer brands represent a strong tool brand for high-productivity carbide and high-speed steel drill and tap products. Precision was founded in 1952 in Crystal Lake, IL. Dormer Tools, founded in 1913 in Sheffield, England, is known for innovative metalworking products.
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