YG-1 EM668 Carbide Corner Radius End Mill, Long Reach, Uncoated (Bright) Finish, 45 Deg Helix, 8 Flutes, 4.125' Overall Length, 0.75' Cutting Diameter, 0.75' Shank Diameter, 0.030' Corner Radius: Industrial & Scientific. YG-1 EM668 Carbide Corner Radius End Mill, Long Reach, Uncoated (Bright) Finish, 45 Deg Helix, 8 Flutes, 4.125" Overall Length, 0.75" Cutting Diameter, 0.75" Shank Diameter, 0.030" Corner Radius: Industrial & Scientific. Corner radius end mills have cutting edges with rounded corners to reduce chipping and provide longer tool life . Suitable for high-performance machining and finishing on high-hardened materials up to Rockwell hardness C70 . Long-length end mills have longer cutting edges and can make deeper cuts than standard-length end mills . Titanium aluminum nitride (TiAlN) coating lubricates the end mill for high-temperature stability and abrasion resistance at high cutting speeds, offering better heat resistance than TiN and TiCN coatings . High-performance carbide provides better wear resistance and toughness than standard carbide and can run at higher speeds than high-speed or cobalt steel, resisting wear and high cutting temperatures . The EM668 TiAlN-coated carbide long-length corner radius end mill has a 45-degree helix, multiple flutes, and a center-cutting design for high-performance machining and finishing on high-hardened materials up to Rockwell hardness C70. Corner radius end mills have a square end with rounded corners on the cutting edges to reduce chipping and extend the life of the tool. Long-length end mills have longer cutting edges than standard-length end mills for applications with a high depth of cut. (Feed should be reduced by about 50%.) The 45-degree helix angle offers increased cutting action compared to end mills with lower helix angles, as it moves excess material quickly up the spiral and away from the workpiece. The number of flutes varies by diameter to optimize the feed and cut rate. The center-cutting design has cutting teeth at the end of the tool, so it can be fed into the workpiece like a drill bit. . The TiAlN coating resists heat better than TiN and TiCN coatings, increasing tool life and performance. It also offers increased hardness compared to TiN and may reduce the need for lubricants based on the application. The high-performance carbide substrate provides better wear resistance and toughness than standard carbide. It is also harder than high-speed or cobalt steel, making it more wear resistant at high speeds and providing longer tool life. Cutting diameter tolerance is + 0.0000 to - 0.0012". The round shank accommodates a range of tool holders. . End mills are designed to remove material and create multi-dimensional shapes and profiles. They have cutting edges along the outside diameter and flutes that remove chips from the cutting area and allow cooling fluids to enter. If heat is not reduced effectively, the tool’s cutting edges will dull and additional material buildup can occur. The number of flutes can range from two to eight. Two-flute designs offer the most efficient chip removal, but more flutes provide a smoother finish. The shank is the end of the tool held in place by a tool holder or machine. Center-cutting end mills can create three-dimensional shapes and profiles, and make plunge cuts similar to a drill bit. Non-center-cutting end mills are for applications such as peripheral milling and finishing, but cannot make plunge cuts. . manufactures drills, taps, end mills, and rotary tooling. The company, founded in 1981, is headquartered in South Korea and has a U.S. office in Vernon Hills, IL.. . . . .