Accupro 312791 Corner Radius End Mill 1 in 7 Flute Carbide

Product Description

The ACCUPRO 312791 is a solid carbide corner radius end mill designed for precision milling in demanding machining environments. With a 1-inch diameter and a 1-1/4-inch length of cut, it runs 7 flutes in a right-hand spiral configuration with a 38-degree helix angle. The AlCrTiN coating improves heat resistance and tool life at elevated cutting speeds. Micrograin carbide construction provides the rigidity needed for stable cuts in harder workpiece materials. This is a single-end, non-centercutting tool, making it suited for side milling and profiling operations rather than plunging.

This end mill is used in CNC machining centers and manual milling setups where a corner radius profile is required to reduce stress concentrations at part corners or meet specific design geometry. The 0.090-inch corner radius produces a controlled blend between the floor and wall of a pocket or slot. With a 4-inch overall length and a 1-inch straight-cylindrical shank, it fits standard ER and side-lock toolholders commonly found in production and job-shop environments. Machinists working in aerospace, mold and die, and general metalworking applications will find this tool applicable for finishing and semi-finishing passes.

Key Features

• 7-flute design increases feed rate capability and improves surface finish on harder materials
• AlCrTiN coating provides oxidation resistance and extends tool life at high cutting temperatures
• 0.090-inch corner radius reduces stress risers and meets common part print callouts
• Micrograin solid carbide construction delivers rigidity and wear resistance
• 38-degree helix angle promotes smooth chip evacuation and reduced cutting forces
• Non-centercutting geometry - designed for peripheral and side milling, not plunge entry

Compatibility

Designed as an OEM-style replacement or upgrade for solid carbide corner radius end mills in the ACCUPRO HS series. Fits standard straight-cylindrical toolholders accepting a 1-inch shank diameter.

Installation Notes

Installation should be performed by a qualified machinist following shop safety procedures. Ensure the spindle is fully stopped and the machine is powered down before changing tooling. Seat the shank fully in the toolholder to the recommended gauge line and torque the retention mechanism per the toolholder manufacturer specifications. Verify runout with a dial indicator before beginning a production cut, particularly given the tight mill diameter tolerance of +0.000/-0.001 inches.