Accupro 312757 Corner Radius End Mill 3/4 in 7 Flute Carbide

Product Description

The ACCUPRO 312757 is a solid carbide corner radius end mill designed for high-performance milling applications where edge strength and surface finish matter. Built to Series HS specifications, it features a 3/4-inch diameter, a 2-1/4-inch length of cut, and a 0.060-inch corner radius that protects the cutting edge and reduces stress concentrations at the base of milled pockets and slots. The 7-flute geometry, combined with a 38-degree helix angle and an AlCrTiN coating, supports aggressive material removal in hardened steels, stainless alloys, and other demanding workpiece materials. Machinists and tool and die professionals install this end mill on CNC machining centers requiring tight tolerances and extended tool life.

This end mill is suited for finishing and semi-finishing passes in ferrous and hardened materials on vertical and horizontal CNC machining centers. The non-centercutting design means it is not intended for plunge cutting; it should be entered via ramping or helical interpolation. The straight-cylindrical shank accepts standard ER or end mill holders sized for 3/4-inch bore. The single-end configuration and 5-inch overall length provide adequate reach for medium-depth pockets and profiling operations.

Key Features

• Solid micrograin carbide construction for rigidity and wear resistance in demanding alloys
• AlCrTiN coating improves heat resistance and extends tool life in high-speed dry or near-dry cutting
• 7-flute, right-hand spiral geometry increases feed capacity and surface finish quality
• 0.060-inch corner radius reduces edge chipping and stress at pocket floors
• 38-degree helix angle promotes smooth chip evacuation and reduces cutting forces
• Non-centercutting design requires ramp or helical entry — not suitable for direct plunge

Compatibility

Designed as a Series HS replacement or direct-use solid carbide corner radius end mill for CNC machining centers accepting a 3/4-inch straight-cylindrical shank in standard ER collet chucks or end mill holders.

Installation Notes

Installation is performed by qualified machinists or CNC setup technicians. Ensure the machine spindle is fully stopped and locked out before changing tooling. Seat the shank fully into the holder and torque the retention mechanism to the holder manufacturer's specification. Confirm runout with a dial indicator before initiating a cut, as excessive runout will accelerate edge wear on a 7-flute tool.