Gw Carbide - 5xd Internal Coolant Tungsten Carbide Drill Bits with

 5xd Internal Coolant Tungsten Carbide Drill Bits for Cast Iron Machining

Raw micro grain material, high hardness and T.R.S
Co: 10%,Wc:90%
TRS: >3600 N/mm2
HRA: 91.8-92.4, HRC:45-50/55-60/65/68
Grain size: 0.4-0.6μm
Helix angle: 30°-45 °
Diameter of cutting edge: 0.2-0.9mm; 1-20mm
Diameter of rods: 4-20mm     
Length: 50-100mm
Cutting Form: Flat,Square,Ball nose, Ball, Corner Radius, Taper Flute, etc.
Flutes No.: 1-7

Application and usage
Suitable to cut Copper, Cast Iron, Carbon steel, Tool steel, Mould steel, Stainless steel, Plastic, Arcylic, etc. 

Coating
Black oxide is an inexpensive black coating. A black oxide coating provides heat resistance and lubricity, as well as corrosion resistance. Coating increases the life of high-speed steel bits.
Titanium nitride (TiN) is a very hard ceramic material that can be used to coat a high-speed steel bit (usually a twist bit), extending the cutting life by three or more times. However, when the bit is sharpened the new edge will not have the benefits of the coating.
Titanium aluminum nitride (TiAlN) is a similar coating that can extend tool life five or more times.
Titanium carbon nitride (TiCN) is another coating also superior to TiN.
Diamond powder is used as an abrasive, most often for cutting tile, stone, and other very hard materials. Large amounts of heat are generated by friction, and diamond coated bits often have to be water cooled to prevent damage to the bit or the workpiece.
Zirconium Gewin has been used as a drill bit coating for some tools under the Craftsman brand name

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Grewin carbide