Helical Solutions 86758 Corner Radius End Mill 3/16 in 5 Flute

Product Description

The HELICAL SOLUTIONS 86758 is a 5-flute, solid carbide corner radius end mill designed for high-performance milling in demanding materials. It features a 3/16 inch (0.1875 inch) mill diameter, a 7/32 inch (0.2188 inch) length of cut, and a 2.5 inch overall length. The Tplus PVD coating provides wear resistance suited for cutting stainless steel, high-temperature alloys, and hardened steel. Variable index flute spacing reduces harmonic vibration, improving surface finish and tool life. The centercutting geometry allows plunge entry, and the extended reach design with a 1-1/8 inch reach length accommodates deeper cavity work. Installed by machinists and toolroom professionals on CNC milling equipment.

The 86758 is built for roughing and finishing operations in stainless steel, high-temperature alloys (such as Inconel and titanium), and hard materials up to approximately 65 HRC depending on application parameters. The long-length, extended-reach configuration makes it suitable for mold and die work, aerospace component machining, and medical part production where deep pockets or restricted-access features require a slender neck profile. The 0.0300 inch corner radius reduces stress concentration at the cutting edge and improves part corner geometry in precision cavity milling. High precision toolholders are recommended for this end mill.

Key Features

• 5-flute variable index geometry reduces chatter and improves surface finish
• Tplus PVD coating rated for stainless steel, high-temperature alloys, and hardened steel
• 0.0300 inch corner radius with tolerance of -0.0020 to 0.0020 inch
• Centercutting design allows direct plunge milling
• Extended reach with 1-1/8 inch reach length and 0.1780 inch neck diameter for deep cavity access
• Right-hand cut, right-hand spiral flute, straight-cylindrical shank for standard ER and hydraulic toolholders

Compatibility

Designed for use with high precision toolholders. The 3/16 inch straight-cylindrical shank (h6 tolerance) is compatible with standard ER collet chucks, shrink-fit holders, and hydraulic chucks accepting 3/16 inch shank diameters.

Installation Notes

Installation and tool changes must be performed with the machine spindle fully stopped and locked out per facility safety procedures. Seat the shank fully and evenly in a high precision toolholder to maintain the 0.0005 inch maximum TIR specification. Inspect the cutting edges and corner radius for chips or wear before each use, as carbide end mills in hard materials are sensitive to interrupted cuts and thermal shock. Flood coolant or minimum quantity lubrication (MQL) is recommended where the machine setup permits, even though this tool does not feature through-coolant capability.