Osg HP421-5625 Square End Mill 9/16 Inch 2 Flute Solid Carbide

Product Description

The OSG HP421-5625 is a solid carbide square end mill designed for high-performance milling in demanding machining environments. Part of the OSG HP421 series, this centercutting end mill features a 9/16-inch diameter, a 1-1/8-inch length of cut, and a 35-degree helix angle with a TiAlN coating. The TiAlN finish improves heat resistance and extends tool life in ferrous and hardened materials. With two right-hand spiral flutes ground from micrograin carbide, this end mill delivers sharp, consistent cutting edges suited to finishing and semi-finishing operations. Machinists and tool-and-die professionals rely on this geometry for slot milling, profiling, and peripheral cuts where precision and edge integrity are critical.

The HP421-5625 is suited for use in vertical and horizontal machining centers handling steel, alloy steel, stainless steel, cast iron, and similar workpiece materials where a TiAlN-coated carbide tool is the appropriate choice. The 9/16-inch straight shank seats directly into standard collet chucks, shrink-fit holders, or end mill holders with a matching 9/16-inch bore. At 3-1/2 inches overall length, the tool provides adequate reach for most conventional milling setups without excess overhang. This is a single-end tool sold individually.

Key Features

• Solid micrograin carbide construction for rigidity and edge retention
• TiAlN coating for elevated heat resistance and extended tool life in ferrous materials
• 35-degree helix angle promotes smooth chip evacuation and reduced cutting forces
• Centercutting design allows direct plunge entry into workpiece material
• Right-hand cut, right-hand flute spiral geometry for standard CNC and manual mill setups
• No chipbreaker, variable helix, or variable index — optimized for consistent finish cuts

Compatibility

Designed as an OEM-style solid carbide end mill for use in standard 9/16-inch end mill holders, collet chucks, or shrink-fit tooling systems on CNC machining centers and manual knee mills.

Installation Notes

Installation and tool changes must be performed with the machine spindle at a full stop and all energy sources locked out per applicable machine safety procedures. Seat the shank fully into the holder and torque the retention fastener to the tooling manufacturer's specification for the holder type in use. Inspect the cutting edges and coating for chips or damage before each use. Proper runout check after installation is recommended to confirm concentricity before beginning a cut.