Robbjack NR-404-04.5 Square End Mill 9/64 in 4 Flute

Product Description

The ROBBJACK NR-404-04.5 is a solid carbide square end mill designed for precision milling in metalworking and machining applications. Built from C2-grade carbide, it delivers consistent performance in ferrous and non-ferrous materials. The 4-flute, spiral geometry with a 30-degree helix angle promotes efficient chip evacuation and smooth cutting action. At 9/64 inch (0.1406 inch) in diameter with a 1/2 inch length of cut, this tool is sized for detail work, slotting, and profile milling where tight tolerances are required. It is uncoated and centercutting, making it suitable for both plunging and peripheral milling operations.

This end mill fits standard CNC machining centers, knee mills, and manual milling machines with a 3/16 inch collet or chuck. It is well suited for small-bore profiling, slot milling, and contour work on aluminum, brass, mild steel, and similar materials. The right-hand cut and right-hand flute orientation is the industry standard for conventional and climb milling setups. With a 2 inch overall length, it provides enough reach for most standard fixturing setups without sacrificing rigidity. Machinists and CNC operators in job shops and production environments are the primary installers and users of this tool.

Key Features

• Solid carbide C2-grade construction for rigidity and wear resistance
• 4 spiral flutes with 30-degree helix angle for efficient chip evacuation
• Centercutting design allows direct plunge entry into workpiece
• Right-hand cut and right-hand flute for standard milling spindle direction
• Straight cylindrical shank at 3/16 inch diameter for secure collet retention
• Uncoated finish suitable for use with cutting fluid on a range of materials

Compatibility

Designed as an OEM-style replacement and standard tooling option for milling machines and CNC machining centers accepting a 3/16 inch straight shank end mill in the NR-404 series.

Installation Notes

Installation is performed by qualified machinists or CNC operators. Power down and lock out the spindle before inserting or removing the tool from any collet or chuck. Ensure the shank is fully seated and the collet nut is torqued per the machine manufacturer's specification for the collet size in use. Inspect the cutting edges for chipping before each use and replace if wear exceeds acceptable limits for the application.