Osg 404-8750-BN11 Ball End Mill 0.875 in 4 Flute Carbide

Product Description

The OSG 404-8750-BN11 is a solid carbide ball end mill designed for both roughing and finishing operations on a wide range of workpiece materials. It features a 0.875-inch cutting diameter, a 1.5-inch length of cut, and four helical flutes with a 30-degree helix angle. The tool is finished with a TiAlN (titanium aluminum nitride) PVD coating, which improves heat resistance and extends tool life in demanding cutting conditions. The straight-cylindrical shank measures 0.875 inches in diameter and the overall length is 4 inches. This is a single-end, right-hand cutting tool from OSG Series 404BN, suited for CNC machining centers and milling applications requiring consistent tolerancing and reliable performance across production runs.

This end mill is rated for use across a broad range of secondary workpiece materials, including steel, stainless steel, cast iron, non-ferrous metals, superalloys, titanium, and hard materials. It is well suited for general-purpose milling, contour work, and 3D profiling where a ball nose geometry is required. The TiAlN coating makes it particularly effective in elevated-temperature cutting environments common in ferrous and hard-material machining. It is appropriate for use in both job shop and production environments where tooling consistency and value are priorities.

Key Features

• 0.875-inch ball nose cutting diameter with a 0.4375-inch nose radius for accurate contour and 3D profile work
• Four helical flutes at a 30-degree medium helix angle for balanced chip evacuation during roughing and finishing
• TiAlN PVD coating provides elevated heat resistance and extends tool life in ferrous and hard-material applications
• Solid carbide construction delivers rigidity and dimensional stability compared to HSS or cobalt alternatives
• Straight-cylindrical shank for standard ER collet or end mill holder compatibility
• Mill diameter tolerance of +0.0000 / -0.0020 inches ensures consistent part geometry across multiple tools

Compatibility

Designed for use on CNC milling machines and machining centers. Rated for steel, stainless steel, cast iron, non-ferrous metals, superalloys, titanium, and hard materials (ISO material codes P, M, K, N, S, H). Straight-cylindrical shank fits standard ER collet chucks and end mill holders sized for 0.875-inch shanks.

Installation Notes

Installation and tool changes should be performed by a qualified machinist or CNC operator with the machine powered down and the spindle fully stopped. Ensure the shank seating depth meets the toolholder manufacturer's minimum engagement specification before tightening. Inspect the collet or holder for wear or contamination before clamping, as runout directly affects tool life and surface finish. Follow the machine builder's and tooling manufacturer's guidelines for speeds, feeds, and depth of cut for the specific workpiece material.