Accupro 12182589 Corner Radius End Mill 1/2 in 4 Flute Carbide

Product Description

The ACCUPRO 12182589 is a solid carbide corner radius end mill designed for precision milling operations where a controlled edge radius is required to reduce stress concentrations and extend part life. The 0.015-inch corner radius and 4-flute geometry deliver smooth surface finishes in ferrous and non-ferrous materials. With a 0.5-inch mill diameter, a 1-inch length of cut, and a 40-degree helix angle, this end mill is suited for side milling, slotting, and profiling in CNC machining centers. The bright uncoated finish makes it a practical general-purpose choice across a range of workpiece materials.

This end mill fits standard CNC milling applications in job shops, tool rooms, and production environments. The 0.5-inch shank diameter seats in ER collets, end mill holders, or shrink-fit toolholders commonly used on vertical and horizontal machining centers. The single-end, centercutting design allows plunge entry and full 3D contouring. Right-hand cutting and right-hand flute direction are standard for conventional CNC spindle configurations. Overall length is 3 inches, keeping the tool rigid for accurate corner radius control during profiling passes.

Key Features

• 0.015-inch corner radius reduces stress risers and improves surface finish on profiled edges
• 4-flute solid micrograin carbide construction for rigidity and wear resistance
• 40-degree helix angle promotes smooth chip evacuation and reduced cutting forces
• Centercutting geometry enables direct plunge entry without pre-drilling
• Bright uncoated finish suitable for use in aluminum, brass, steel, and stainless with appropriate cutting parameters
• Right-hand cut and right-hand spiral match standard CNC spindle rotation

Compatibility

Designed as a direct-fit replacement or standard selection for CNC milling operations requiring a 0.5-inch shank diameter corner radius end mill in ER collet, end mill holder, or shrink-fit tooling systems.

Installation Notes

Installation should be performed by a qualified CNC machinist or toolroom technician. Ensure the spindle is fully stopped and the machine is in an appropriate safe state before changing tooling. Seat the shank fully and evenly in the holder to the minimum recommended insertion depth to maintain runout tolerances. Verify tool projection and runout with a dial indicator before beginning production cuts, as corner radius accuracy is sensitive to holder condition and clamping torque.