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Dormer A3459.5 Extra Length Drill, Morse Taper Shank, Steam Oxide Coating, High Speed Steel, 0.374" Head Diameter, 175 mm Flute Length
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Dormer A3459.5 Extra Length Drill, Morse Taper Features
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Extra-length, for deeper holes
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Morse taper shank, for a secure and accurate tool-holding system
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118-degree, web-thinned, conventional point angles, for reduced drilling pressure
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Black oxide finish, for improving lubricity, resisting corrosion, and resistances to chipping or flaking
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High-speed steel (HSS), for use on a wide variety of materials
About Dormer A3459.5 Extra Length Drill, Morse Taper
The Dormer A345 extra-length, black oxide-coated, general-purpose Morse taper shank drill bit drills holes into a wide variety of metals and synthetic materials. It can drill to a depth up to ten times the diameter of the drill size. The shank diameter is the same as the drill size. The A345 series has a type N flute form, with a regular helix (21 to 34 degrees) angle, and performs best when drilling into magnetic soft steel or structural steel (case carburizing steel). Black oxide helps to prevent buildup and welding of material on the drill’s cutting edge when working with iron and steel. 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 extra length allows for more freedom in being able to drill a wider variety of circumstances. The principle of a Morse taper is that of the cone in the cone. The trunnion (the male portion – drill shank) and the bore (the female portion – the tool- holder) are both uniformly tapered. This system allows for torque to be transferred directly to the drill through the friction between the taper shank and the tool holder. The tang at the end of the taper is used for ejecting the drill bit from the spindle, with the aid of a drift pin. 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. They are made to DIN 340 industry standards, which 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.
