Internal Tool 170-1140-C Corner Rounding End Mill

Product Description

The INTERNAL TOOL 170-1140-C is a solid carbide corner rounding end mill designed to produce consistent radius edges on machined workpieces. With a 1/4 inch mill diameter, a 1/16 inch corner radius, and three straight flutes, it removes material efficiently while generating a smooth, uniform radius profile. The AlTiN coating improves heat resistance and extends tool life during demanding cutting operations. At 4 inches overall length with a matching 1/4 inch cylindrical shank, the tool mounts directly into standard collet chucks and end mill holders. It is intended for use by machinists and tool-and-die professionals working on CNC mills and manual knee mills.

This end mill is suited for edge-rounding and radius-blending operations on a broad range of materials including steel, stainless steel, cast iron, non-ferrous metals, and super alloys including titanium. The single-end, right-hand cutting geometry and right-hand flute direction make it compatible with conventional CNC machining center setups. It is well matched to production environments where consistent corner breaks and radius profiles are required across multiple parts in a run.

Key Features

• Solid carbide construction for rigidity and wear resistance in ferrous and non-ferrous applications
• AlTiN coating for elevated temperature resistance and extended tool life
• 1/16 inch corner radius produces a precise, repeatable radius edge in a single pass
• Three straight flutes with right-hand cut and right-hand helix for standard CNC spindle compatibility
• Single-end design with 1/4 inch cylindrical shank fits standard collet and end mill toolholding systems
• 4 inches overall length provides reach for typical workpiece setups without sacrificing rigidity

Compatibility

Designed as an OEM-style replacement and standard-fit corner rounding end mill for CNC machining centers and manual mills accepting a 1/4 inch cylindrical shank toolholder.

Installation Notes

Installation is performed by qualified machinists or toolroom personnel. Secure the shank fully in a clean, properly sized collet or end mill holder before tightening to the toolholder manufacturer specification. Verify spindle direction is set to right-hand rotation before engaging the cut. Inspect the cutting edges and coating for chips or wear before each use, and do not exceed the recommended depth of cut for the workpiece material and machine rigidity.