Accupro 312137 Corner Radius End Mill 3/8 in 5 Flute

Product Description

The ACCUPRO 312137 is a solid carbide corner radius end mill designed for precision milling operations in ferrous and hardened materials. Built on the HS series platform, it features a 3/8 inch diameter with a 0.090 inch corner radius, 5 flutes, and a variable index geometry that reduces harmonic vibration during aggressive cuts. The AlCrTiN coating provides high-temperature oxidation resistance, making it well suited for high-speed dry or near-dry machining. Overall length is 4 inches with a 1/2 inch length of cut. This tool is installed and operated by machinists and CNC programmers working in job shop, aerospace, die-mold, and general precision machining environments.

This end mill fits applications where a sharp corner must be blended into a defined radius without tool chatter. The extended reach design, with a 1-1/8 inch reach length and a reduced neck diameter of 0.356 inch, allows access to deep pockets and stepped features. Right-hand cutting and right-hand flute spiral are standard for conventional CNC vertical and horizontal machining centers. Single-end configuration means the tool is not reversible, and the centercutting geometry supports plunge entry. Micrograin carbide substrate supports both finishing and semi-finishing passes.

Key Features

• AlCrTiN coating for high-temperature wear resistance in ferrous and hardened stock
• 5-flute variable index geometry reduces vibration and improves surface finish
• 0.090 inch corner radius blends sharp corners and reduces stress concentrations in workpieces
• Extended reach with 1-1/8 inch reach length and reduced 0.356 inch neck diameter for deep pocket access
• Centercutting design allows direct plunge entry without pre-drilling
• Micrograin solid carbide substrate for rigidity and edge retention

Compatibility

Designed as an OEM-style replacement or direct-use solid carbide corner radius end mill for CNC machining centers and manual mills accepting a 3/8 inch straight shank collet or end mill holder.

Installation Notes

Installation should be performed by a qualified machinist or CNC setup technician. Secure the shank in a precision collet or end mill holder to the recommended pull-out depth before tightening. Verify runout with a dial indicator before running the spindle. Always confirm spindle direction matches the right-hand cutting geometry before engaging the workpiece.