Machinists Tools Catalog
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30 COUNTERSINKS · Technical Information Countersinking types Countersinks open up the top of an existing drilled hole to allow for the head of a flat head screw to set flush to the workpiece. The zero flute countersinks can also deburr the top of an existing hole as well. Single Flute: Large positive rake and single flute construction provide a smooth surface finish on a wide variety of materials. Known to be the most centering of all the countersinks. Three & Four Flute: End user can expect the best chip clearance, and these are suitable when machining plastics & non-ferrous metals like aluminum, copper, brass & bronze. Six Flute: Provides for the highest feed rate of all countersinks. Cutting load is evenly distributed providing a longer tool life. Drill Point: This design allows the user to spot drill & countersink with the same tool. CNC: Tight dimensions on length and angle ensure setting accuracy and repeatability. Technical Information · COUNTERSINKS CouNTerSuNk Hole wAiTiNg For SCrew MouNTiNg Zero Flute & Deburring: Chatter-free cutting action requires minimal power. Through-hole design allows for tool resharpening. Micro Stop: The countersink depth can be controlled with the use of the micro stop fixture. FlAT HeAD CAP SCrew MouNTeD iN CouNTerSuNk Hole Aircraft: Shorter overall lengths provide better rigidity and allow for faster speeds. tool Materials Choice of tool material is driven by the workpiece material and number of holes desired along with the life of the countersink. Finish/Coating Coating or surface treatments have a direct effect on tool performance and tool life. They also build a barrier between the cutting tool and workpiece. angle options Cobalt: M35, M42 ­ Better than high speed steel. Cobalt countersinks hold their hardness at much higher temperatures and are well suited for harder to machine materials and stainless steels. Bright: Surface is untreated. Use for general purpose countersinking of most metals, wood and plastic. 60º: Designed for creating holes on a shaft that will be used to machine between centers. High Speed Steel: Economical choice for general applications in most materials including steel, cast iron and forgings. Provides good tool life and efficiency. Steam Homogeneous Surface Treatment: Blackening ­ to prolong tool life & prevent galling. 82º: Creates holes that match the angle of popular flat and oval head screws. Solid Carbide: Resists wear better than both high speed steel and cobalt steel. Has a better degree of accuracy for countersinking very hard materials such as stainless steel, titanium alloys and nickel alloys. TiN Coated: Long Life Titanium Nitride ­ Bright Gold ­ is a very hard ceramic material, and when used to coat a high speed steel bit can extend the cutting life by three or more times. Increases machining speeds by 25% to 30%. 90º: Creates holes that match the angle of popular flat and oval head screws & is used to enlarge existing holes.
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