Accupro 12183494 Corner Radius End Mill 1/4 in 4 Flute Altin

Product Description

The ACCUPRO 12183494 is a solid carbide corner radius end mill designed for precision milling operations in ferrous and non-ferrous metals. It features a 1/4 inch mill diameter, a 1 inch length of cut, and a 0.09 inch corner radius that blends floor-to-wall transitions cleanly while reducing stress concentrations at the cutting edge. The micrograin carbide substrate provides rigidity and wear resistance, and the AlTiN coating adds thermal protection for extended tool life in high-speed and dry cutting conditions. With 4 right-hand spiral flutes and a centercutting geometry, this end mill handles both plunge and peripheral milling in a single setup.

This end mill is suited for CNC machining centers performing profiling, slotting, and contouring passes where a radiused corner is required by part geometry or drawing specification. The long-length configuration, with a 4 inch overall length and 1/4 inch shank diameter, accommodates moderate reach applications in mold work, die work, and general precision part machining. It is a single-end tool installed by machinists and CNC programmers in job shops, tool rooms, and production environments.

Key Features

• 0.09 inch corner radius reduces edge chipping and meets radiused corner callouts on machined parts
• AlTiN coating improves heat resistance for dry milling and high-speed cutting of hardened steels and stainless alloys
• Micrograin solid carbide substrate delivers stiffness and dimensional stability throughout the cut
• 4 right-hand spiral flutes with centercutting capability allow plunge entry without a pre-drilled hole
• Long-length geometry (4 inch OAL) provides reach for deeper pockets and stepped features
• Mill diameter tolerance of +0.000000 to -0.002500 inches supports close-tolerance profiling applications

Compatibility

Designed as a direct-fit replacement or standard tooling selection for CNC milling machines and machining centers accepting a 1/4 inch straight shank via collet, end mill holder, or hydraulic chuck.

Installation Notes

Installation should be performed by a qualified machinist or CNC operator with the spindle fully stopped and the machine in a safe, locked-out state before tool changes. Seat the 1/4 inch shank fully into the toolholder to the recommended gauge line and torque the retention mechanism per the toolholder manufacturer specification. Verify runout at the cutting edge with a dial indicator before beginning a production cut. Confirm spindle direction is set to right-hand rotation before engaging the cut.