Robbjack NR-404-06.5 Square End Mill 13/64 in 4 Flute Carbide

Product Description

The ROBBJACK NR-404-06.5 is a solid carbide square end mill designed for precision milling operations in metal, composites, and other hard materials. It features a 13/64-inch (0.2031-inch) cutting diameter with a 4-flute, spiral configuration and a 30-degree helix angle. The straight cylindrical shank measures 1/4 inch in diameter, making it compatible with standard collet and end mill holders. This tool is centercutting, allowing direct plunge entry into workpieces. It is intended for use by machinists and tooling professionals in both manual and CNC machining environments.

The NR-404-06.5 belongs to the RobbJack NR-404 Series and is suited for slotting, profiling, and side milling applications where tight tolerances are required. The 5/8-inch length of cut and 2-1/2-inch overall length make it a regular-length tool appropriate for moderate-depth pocketing and contour work. It carries a right-hand cut and right-hand flute direction, standard for conventional and climb milling setups. The uncoated carbide construction is well suited to applications where coating is not required or where post-coating will be applied.

Key Features

• Solid carbide construction, Material Grade C2, for rigidity and wear resistance
• 4-flute spiral design with 30-degree helix angle for efficient chip evacuation
• Centercutting geometry allows direct plunge milling without pre-drilled entry
• Right-hand cut and right-hand flute direction for standard CNC and manual mill setups
• Mill diameter tolerance of +0.001/-0.000 inch for precise fit and consistent cut quality
• Straight cylindrical 1/4-inch shank with -0.0001/-0.0002 inch shank diameter tolerance

Compatibility

Designed as an OEM-style tooling solution for use in standard 1/4-inch collet chucks, end mill holders, and compatible CNC or manual milling machine spindles accepting straight cylindrical shanks.

Installation Notes

Installation should be performed by a qualified machinist familiar with toolholder torque requirements and runout inspection procedures. Always ensure the machine spindle is fully stopped and locked out before changing tooling. Seat the shank fully into the holder and verify runout with a dial indicator before beginning a cut. Consult the machine manufacturer and applicable shop safety standards for proper speeds and feeds for carbide end mills.