Accupro 31857220 Ball End Mill 3/8 in 4 Flute Solid Carbide

Product Description

The ACCUPRO 31857220 is a solid carbide ball end mill designed for precision milling operations in ferrous and hardened materials. With a 3/8 inch diameter and a 4-flute configuration, it delivers clean material removal and fine surface finishes in profiling, slotting, and contouring applications. The AlTiCrN coating provides high heat resistance and extended tool life under demanding cutting conditions. The single-end design with a 3/8 inch shank diameter is standard for use in CNC machining centers and manual mills equipped with collet or end mill holders. Machinists and toolroom operators are the primary end users.

This end mill is suited for finish and semi-finish milling passes on hardened steels, stainless, and high-temperature alloys where tool wear is a primary concern. The 0.3200 inch length of cut and 2.25 inch neck length allow for reach into pockets and contoured features without excessive deflection. With a 4 inch overall length and a variable index design, it supports chip thinning strategies common in high-efficiency milling routines used in production and job shop environments.

Key Features

• AlTiCrN coating for elevated heat and wear resistance in hard materials
• 4-flute solid carbide construction for rigidity and finish quality
• Variable index flute spacing to reduce harmonic chatter during cutting
• 0.3200 inch length of cut suited for shallow pocket and contour work
• 2.25 inch neck length provides extended reach for deep feature access
• Single-end design with 3/8 inch shank for standard collet compatibility

Compatibility

Designed for use in CNC machining centers and manual milling machines accepting a 3/8 inch shank diameter end mill holder or collet. No specific machine model compatibility was stated by the manufacturer for this part number.

Installation Notes

Installation should be performed by a qualified machinist or CNC operator. Ensure the spindle is fully stopped and locked before inserting or removing the tool. Verify collet or holder runout within acceptable tolerances before beginning a cut, as excessive runout will accelerate edge wear on carbide tooling. Follow the machine tool manufacturer guidelines for clamping torque on collet nuts and set screws.