by Precision
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The Dormer A141 Jobber-length, combination black oxide (also called steam tempered) and gold oxide, general-purpose, round shank drill bit drills holes into a wide variety of metals and synthetic materials with best performance with steel, stainless steel, cast iron, titanium, nickel, and copper. It can drill to a depth up to four times the diameter of the drill size.
Combination black and gold oxide finish improves lubricity, resists corrosion, and will not chip or flake off. Black and gold oxide is an appealing surface treatment which combines the benefits of both. Black oxide finish gives a strongly adhering blue oxide surface that acts to retain cutting fluid and prevent chip to tool welding, reducing the formation of a built-up edge. 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 A141 series has a type W flute form, with a fast helix angle of 35 to 45 degrees, and are most suitable for drilling into stainless steel and titanium. They are a common choice for drilling in materials of low tensile strength. The flutes quickly clear out chips.
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 ANSI (fractional sizing) standards, which ensure that drill bits around the world, confirm to the same specifications.
Precision manufactures machine tools under the following brands: Precision Twist, Precision Dormer, and Union Butterfield. They have locations around the world, and provide tools adhering to ANSI, NAS, and DIN standards.
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