Hertel E5250020 Ball End Mill 5/16 in 4 Flute Solid Carbide

Product Description

The HERTEL E5250020 is a solid carbide ball end mill designed for precision milling operations in metalworking and machining environments. With a 0.3125-inch (5/16 inch) mill diameter and a 0.8125-inch length of cut, this single-end tool delivers consistent performance in contouring, profiling, and 3D surface work. The 4-flute configuration provides a balance of chip evacuation and surface finish quality. A 30-degree helix angle promotes smooth cutting action and reduces chatter during operation. This tool is intended for use by machinists and tooling professionals in production and job-shop settings.

The E5250020 is suited for milling ferrous and non-ferrous materials where a ball-nose geometry is required for curved surface generation, radius milling, or finishing passes. The uncoated solid carbide construction makes it a general-purpose option appropriate for use with cutting fluids in controlled machining environments. It is a single-end tool, meaning the cutting geometry is on one end only. This mill fits standard 5/16-inch collets or end mill holders used on CNC machining centers and manual knee mills.

Key Features

• 0.3125-inch (5/16 inch) ball nose diameter for radius and contour milling
• 4 flutes for improved surface finish and feed rate capability
• 30-degree right-hand helix angle reduces vibration and improves chip flow
• Solid carbide construction for rigidity and wear resistance
• Uncoated finish suitable for use with standard cutting fluids
• Single-end design with 2.5-inch overall length and 5/16-inch shank diameter

Compatibility

Designed as an OEM-style replacement or direct tooling option for standard 5/16-inch end mill holders and collet chucks used on CNC machining centers and conventional milling machines.

Installation Notes

This end mill is installed by a machinist or tooling technician using a compatible collet or end mill holder torqued to the machine spindle per the machine tool manufacturer specifications. Ensure the machine spindle is fully stopped and locked out before changing tooling. Verify runout with a dial indicator after seating the tool to confirm concentricity before beginning a cut. Do not exceed the recommended depth of cut or feed rate for the workpiece material and machine rigidity.