Accupro 12183253 Corner Radius End Mill 5/16 in 4 Flute Carbide

Product Description

The ACCUPRO 12183253 is a solid carbide corner radius end mill designed for precision milling in metalworking and machining applications. It features a 5/16-inch diameter with a 0.02-inch corner radius, providing a controlled blend between the cutting face and workpiece surface that reduces stress concentration and improves surface finish. With 4 flutes, a 40-degree helix angle, and an extra-long 1-5/8-inch length of cut, this tool is built for deeper reaching operations where standard-length end mills fall short. The bright, uncoated finish suits general-purpose ferrous and non-ferrous cutting. This end mill is installed and operated by machinists and CNC tool-and-die professionals.

This tool is suited for CNC machining centers, vertical mills, and manual knee mills in job shop, aerospace, mold-and-die, and general precision machining environments. The single-end, centercutting design allows plunge entry as well as conventional peripheral milling. The extra-long length of cut is particularly useful when profiling deep pockets, cavities, or contoured surfaces where standard flute length would not reach. The right-hand flute direction and right-hand cutting orientation match the most common spindle configurations in shop-floor use.

Key Features

• 0.02-inch corner radius reduces edge chipping and improves part surface finish at floor-to-wall transitions
• Solid micrograin carbide construction provides hardness and wear resistance across a range of workpiece materials
• Extra-long 1-5/8-inch length of cut reaches deep pockets and cavities standard-length tools cannot access
• 40-degree helix angle promotes smooth chip evacuation and reduced cutting forces
• Centercutting geometry allows direct plunge entry without pre-drilling
• Bright, uncoated finish is compatible with coolant and cutting oils without coating adhesion concerns

Compatibility

Designed as a direct-fit replacement or standard tooling selection for any spindle or collet system accepting a 5/16-inch straight shank, including ER-style collet chucks, end mill holders, and hydraulic chucks commonly used in CNC machining centers and manual mills.

Installation Notes

Installation is performed by a machinist or CNC setup technician. Ensure the spindle is fully stopped and locked before inserting or removing the tool from the holder. Verify collet or chuck bore size matches the 5/16-inch shank diameter and that runout is within acceptable tolerance before beginning a cut. Follow shop-standard torque procedures for the collet nut or set screw without over-tightening, which can distort the shank and affect runout.