Helical Solutions 81425 Corner Radius End Mill 1/4 in 3 Flute

Product Description

The HELICAL SOLUTIONS 81425 is a solid carbide corner radius end mill designed for high-performance milling in a wide range of materials. It features a 1/4 inch diameter with a 0.0150 inch corner radius, a 1/2 inch length of cut, and a 2 inch overall length. The three-flute, single-end geometry with a variable pitch and high helix angle supports both roughing and finishing operations in a single tool. The bright, uncoated finish and centercutting capability make this mill well-suited for aluminum and non-ferrous metals as its primary application, with additional capability in steel, stainless steel, cast iron, high-temperature alloys, and hard materials.

This end mill fits production and job-shop CNC machining environments where tight tolerances and surface finish quality are priorities. The H40ALV-3 series is engineered primarily for aluminum and non-ferrous metal applications, though the secondary material range extends to steel, stainless steel, cast iron, high-temperature alloys, and hard materials. The 1/4 inch straight cylindrical shank is compatible with high-precision toolholders. It is suited for vertical machining centers and similar CNC platforms where a right-hand cutting, right-hand spiral tool is required.

Key Features

• 0.0150 inch corner radius with a tolerance of -0.0020 to 0.0020 inches for consistent edge geometry
• Variable pitch, three-flute design supports both roughing and finishing in a single pass
• High helix, 40 degree angle reduces cutting forces and improves chip evacuation in aluminum
• Centercutting geometry allows plunge entry into workpiece material
• Solid carbide construction provides rigidity and wear resistance across primary and secondary workpiece materials
• TIR maximum of 0.0003 inches ensures runout control in high-precision toolholder setups

Compatibility

Designed for use with high-precision toolholders. Primary workpiece material is aluminum and non-ferrous metal. Secondary workpiece materials include steel, stainless steel, cast iron, high-temperature alloys, and hard materials. Series H40ALV-3.

Installation Notes

Installation is performed by a machinist or CNC setup technician. The machine spindle must be fully stopped and the tool path program verified before tool changes. Ensure the toolholder bore and shank mating surfaces are clean and free of chips before clamping. Follow toolholder manufacturer torque and runout specifications when seating the shank.