The YG-1 E2248 uncoated cobalt steel roughing-finishing square nose end mill has multiple flutes, a center-cutting design, and a 30-degree helix for high-production metal removal with a fine finish on a range of materials. The end mill has chip-breaking cutting edges that create small chips for heavy cuts and remove material in less time than conventional end mills, with minimal vibration (chatter). It produces a finer finish than fine- or coarse-pitch roughers. The number of flutes varies by diameter to optimize the feed and cut rate. The tool’s square end creates sharp, unrounded cuts. 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 30-degree helix angle supports general-purpose roughing-finishing applications. It balances lower angles’ strong cutting edge for difficult-to-machine materials with higher angles’ increased cutting action.

Cobalt steel can be run at faster speeds and stays sharp longer than high-speed steel tools, while offering resistance to heat and abrasion. This tool has no coating or surface treatment and can be used on a range of materials. Cutting diameter tolerance is + 0.0025 to - 0.0000". The tool has a Weldon shank.

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.

YG-1 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.