Robbjack NR-404-32 Square End Mill 1 in 4 Flute Carbide

Product Description

The ROBBJACK NR-404-32 is a solid carbide square end mill designed for precision milling in ferrous and non-ferrous materials. It features a 1 inch cutting diameter, a 1-1/2 inch length of cut, and a 4 inch overall length, making it a regular-length tool suited for general-purpose profiling, slotting, and peripheral milling. The 30-degree helix spiral flute geometry promotes efficient chip evacuation and smooth cutting action. With four flutes and a right-hand cut and right-hand flute configuration, this end mill delivers a good balance of material removal rate and surface finish. The uncoated C2 carbide grade provides a sharp edge and is compatible with a range of metalworking applications.

This end mill is intended for use in CNC machining centers and manual mills where a 1 inch shank diameter is required. It is suited for production and job-shop environments handling steel, aluminum, cast iron, and similar materials. The centercutting design allows direct plunge entry into the workpiece, giving machinists flexibility in toolpath programming. Its regular-length geometry keeps deflection low during shoulder milling and full-width slotting passes.

Key Features

• Solid carbide construction for rigidity and wear resistance in demanding cuts
• 1 inch cutting diameter with 1-1/2 inch length of cut for standard-depth passes
• 30-degree helix angle promotes smooth chip flow and reduced cutting forces
• Centercutting design supports direct plunge milling without a pre-drilled pilot hole
• Right-hand cut and right-hand flute configuration for standard spindle setups
• Uncoated C2 carbide grade retains a sharp edge on a broad range of workpiece materials

Compatibility

Designed as an OEM-style replacement or direct-application solid carbide square end mill for CNC machining centers and knee mills accepting a 1 inch straight shank, within the ROBBJACK NR-404 series.

Installation Notes

Installation should be performed by a qualified machinist following shop safety protocols. Ensure the machine spindle is fully stopped and locked out before inserting or removing the end mill from the tool holder. Use a properly sized collet or end mill holder that matches the 1 inch shank diameter to maintain runout tolerances. Verify tool projection and stick-out before beginning any cut to minimize vibration and deflection.