Helical Solutions 87380 Corner Radius End Mill 3/8 in 5 Flute

Product Description

The HELICAL SOLUTIONS 87380 is a 5-flute, solid carbide corner radius end mill designed for high-performance metal removal in demanding machining applications. Built to the HEV-C-5 series specification, it features a 3/8 inch mill diameter, a 0.0300 inch corner radius, and a 3/4 inch length of cut. The Tplus PVD coating provides elevated wear resistance and thermal stability. Variable index geometry reduces chatter and harmonics, making it a practical choice for finishing and semi-finishing passes in difficult materials. Licensed machinists and CNC operators working in job shops, aerospace, and precision manufacturing are the primary users.

The 87380 is engineered for primary use in stainless steel, high-temperature alloys, and hardened steel. It is also rated for secondary applications in steel and cast iron. The single-end, centercutting design supports plunge entry, slot milling, and profile operations. The straight-cylindrical shank seats in high-precision toolholders as recommended by the manufacturer, ensuring minimal runout on multi-axis CNC machining centers. The 2.5 inch overall length provides adequate reach for most standard workpiece setups without sacrificing rigidity.

Key Features

• 5-flute spiral geometry with variable index pitch for vibration damping during aggressive cuts
• Tplus PVD coating rated for stainless steel, high-temperature alloys, and hardened steel
• 0.0300 inch corner radius with a tight tolerance of -0.0020 to 0.0020 inches
• Centercutting design allows direct plunge entry without a pre-drilled pilot hole
• Right-hand cut, right-hand flute direction — compatible with standard CNC spindle rotation
• Maximum TIR of 0.0005 inches supports tight-tolerance finishing work

Compatibility

Recommended for use with high-precision toolholders. Primary workpiece materials include stainless steel, high-temperature alloys, and hardened steel. Secondary materials include steel and cast iron.

Installation Notes

Installation should be performed by a qualified machinist or CNC setup technician. Ensure the machine spindle is fully stopped and the toolholder is clean and free of chips before seating the end mill. Use a high-precision collet or shrink-fit holder as recommended for this series to stay within the 0.0005 inch TIR specification. Verify tool runout with a dial indicator after clamping before beginning the cut cycle.