Osg HP434-1872 Corner Radius End Mill 3/16 in 4 Flute

Product Description

The OSG HP434-1872 is a solid carbide corner radius end mill designed for precision milling in demanding machining environments. It carries a 3/16 inch (0.1875 inch) mill diameter, a 0.02 inch corner radius, and four right-hand spiral flutes with a medium helix for balanced chip evacuation and surface finish. The cutting edge is TiAlN coated via a PVD process, which improves heat resistance and tool life when working in high-temperature alloys and hardened steels. This is a single-end, centercutting tool, meaning it can be ramped or plunged into the workpiece. It is installed and run by CNC machinists and toolroom operators in production and job-shop settings.

The HP434-1872 is built for roughing and finishing operations across a broad range of workpiece materials including steel, stainless steel, cast iron, non-ferrous metals, superalloys, titanium, and hard materials. Its regular-length geometry and straight cylindrical shank make it a straightforward drop-in for standard collet chucks and shrink-fit toolholders. The 5/8 inch length of cut and 2 inch overall length suit it to shallow-to-medium depth slot milling, profiling, and contouring passes where a corner radius is required to reduce stress concentrations at the base of a feature.

Key Features

• TiAlN PVD coating for extended tool life in high-heat and hard-material applications
• 0.02 inch corner radius reduces stress risers and improves surface finish at feature floors
• Four right-hand flutes with normal pitch and medium helix for stable cut across steel and stainless
• Centercutting geometry allows ramping and plunge entry without a pre-drilled hole
• Solid carbide construction provides rigidity and wear resistance beyond HSS tooling
• Straight cylindrical shank with h6 tolerance for accurate, repeatable toolholder seating

Compatibility

Designed for use with standard collet chuck and shrink-fit toolholders accepting a 3/16 inch straight cylindrical shank. Suitable for CNC machining centers and manual mills running steel, stainless steel, cast iron, non-ferrous metals, superalloys, titanium, and hard materials per the HP434 series application range.

Installation Notes

This tool is installed by machinists in collet chucks or shrink-fit toolholders rated for the 3/16 inch shank diameter. Confirm toolholder runout is within acceptable limits before operation, as excessive runout accelerates wear on small-diameter carbide end mills. Always verify spindle speed and feed rate against the material and coating manufacturer recommendations before engaging the cut. Carbide tooling is brittle — avoid dropping or impacting the cutting end during handling and storage.