Robbjack NR-303-07 Square End Mill 7/32 in 3 Flute Carbide

Product Description

The ROBBJACK NR-303-07 is a solid carbide square end mill designed for precision milling in metal, composites, and other hard materials. Part of the NR-303 series, this tool features a 7/32 inch (0.2188 inch) cutting diameter, a 5/8 inch length of cut, and a 1/4 inch shank diameter with an overall length of 2-1/2 inches. The three-flute, right-hand spiral geometry with a 30-degree helix angle promotes efficient chip evacuation and smooth cutting action. Its centercutting capability allows for direct plunge entry into workpieces. Licensed machinists and tool-and-die professionals working with CNC machining centers or manual mills are the primary users of this tool.

This end mill fits standard milling applications where a regular-length, uncoated solid carbide tool is appropriate. The 1/4 inch shank seats in standard collets and tool holders commonly found on vertical machining centers and knee mills. At 0.125 pounds, it is lightweight and easy to handle during tool changes. The NR-303 series is suited for general-purpose slotting, profiling, and peripheral milling operations in production and maintenance machining environments.

Key Features

• Solid carbide construction, material grade C2, for rigidity and wear resistance
• 3-flute right-hand spiral with 30-degree helix angle for efficient chip removal
• Centercutting design allows direct plunge milling without pre-drilling
• Uncoated finish suitable for use with cutting fluids on a wide range of materials
• Right-hand cut and right-hand flute geometry for standard spindle rotation
• Regular-length body for stable reach in typical milling setups

Compatibility

Designed as an OEM-style replacement or direct-use solid carbide square end mill for standard 1/4 inch collet and toolholder systems used in CNC and manual milling applications.

Installation Notes

Installation is performed by qualified machinists following standard toolroom practices. Ensure the machine spindle is fully stopped and locked out before inserting or removing the tool from the collet or end mill holder. Verify collet size matches the 1/4 inch shank diameter and torque the collet nut to the toolholder manufacturer specification. Confirm runout is within acceptable limits before beginning the cut to avoid premature tool wear or breakage.