Cleveland C39148 Ball End Mill 5/16 in 2 Flute Hss Tin

Product Description

The CLEVELAND C39148 is a double-end ball end mill designed for machining contoured surfaces, slots, and three-dimensional profiles in a wide range of materials. It measures 0.3125 inches in diameter with a 0.5625-inch length of cut and an overall length of 3.5 inches. Manufactured from high speed steel and finished with a titanium nitride (TiN) coating, it delivers improved wear resistance and extended tool life compared to uncoated HSS tooling. The two-flute geometry and 30-degree helix angle promote efficient chip evacuation during milling operations. This end mill belongs to the HD-2B series and is suited for general-purpose milling in machine shops and production environments.

This end mill is appropriate for use in vertical machining centers, knee mills, and CNC milling machines where ball-nose profiling or finishing passes on curved or ramped surfaces are required. The double-end configuration doubles usable cutting life from a single tool. The 0.375-inch shank diameter fits standard ER and R8 collets common in shop environments. It is typically installed and operated by machinists and tool-and-die professionals working in job shop, manufacturing, and maintenance machining applications.

Key Features

• Double-end design provides two usable cutting ends per tool
• TiN coating increases surface hardness and reduces friction for longer tool life
• 30-degree helix angle promotes smooth chip flow and reduces cutting forces
• Two-flute geometry supports slotting and profiling in a variety of materials
• High speed steel construction offers toughness and regrindability
• HD-2B series designation indicates heavy-duty, general-purpose ball end mill classification

Compatibility

Designed as an OEM-style replacement or direct-use ball end mill for standard 0.375-inch collet or chuck setups on vertical and CNC milling machines requiring a 5/16-inch ball-nose end mill.

Installation Notes

Installation is performed by a qualified machinist. Ensure the machine spindle is fully powered down and the drawbar or collet nut is secure before beginning tool changes. Use the correct collet size for the 0.375-inch shank to prevent runout and slippage during cutting. Verify tool overhang is minimized to reduce deflection, and confirm proper cutting parameters for high speed steel tooling before initiating a cut.