Helical Solutions 84678 Corner Radius End Mill 3/8in 5 Flute

Product Description

The HELICAL SOLUTIONS 84678 is a 5-flute, solid carbide corner radius end mill designed for high-performance milling in demanding materials including stainless steel, superalloys, and titanium. The tool measures 3/8 inches in diameter with a 3/4-inch length of cut and a 0.0100-inch corner radius that reduces edge chipping and improves surface finish on hardened and difficult-to-machine workpieces. At 2.5 inches overall length with a 3/8-inch straight cylindrical shank, it fits standard precision toolholders. The Tplus PVD coating provides thermal and wear resistance suited to the high heat generated in stainless and superalloy cuts. This tool handles both roughing and finishing operations in a single setup. It is installed and used by CNC machinists and toolroom operators in production and job-shop environments.

The 84678 is engineered for milling stainless steel, superalloys, titanium, non-ferrous metals, and hard materials. Its variable-pitch, spiral flute geometry in the HEV-5 series is configured for reduced harmonics and improved chip evacuation in these high-resistance materials. The single-end, centercutting design allows plunge entry and is compatible with high-precision toolholders. Typical applications include contour milling, slot milling, and profile work on aerospace, medical, and industrial components where edge integrity and dimensional accuracy are critical.

Key Features

• 5-flute solid carbide construction for rigidity and wear resistance in hard materials
• 0.0100-inch corner radius reduces stress concentration and extends tool life at workpiece edges
• Tplus PVD coating rated for stainless steel, superalloys, and titanium cutting
• Variable-pitch flute geometry (HEV-5 series) reduces vibration and chatter in demanding cuts
• Centercutting design permits direct plunge entry without pre-drilling
• Right-hand cut and right-hand spiral flute direction for use on standard CNC vertical and horizontal mills
• Compatible with high-precision toolholders for maximum runout control

Compatibility

Designed for use with high-precision toolholders. Suited for CNC machining centers requiring a 3/8-inch straight cylindrical shank end mill. Primary workpiece materials are stainless steel, superalloys, and titanium; secondary workpiece materials include non-ferrous metals and hard materials.

Installation Notes

Installation should be performed by a qualified CNC machinist or toolroom technician. Ensure the spindle is fully stopped and the machine is powered down or in a safe-tool-change state before inserting or removing the end mill. Seat the shank fully in a clean, high-precision collet or toolholder to maintain runout within the specified TIR maximum of 0.0005 inches. Do not exceed the recommended depth-of-cut or feed parameters for the workpiece material, as overloading a solid carbide tool can cause sudden fracture.