Robbjack NR-404-04 Square End Mill 1/8 in 4 Flute Carbide

Product Description

The ROBBJACK NR-404-04 is a solid carbide square end mill designed for precision milling in metalworking and machining applications. With a 0.125-inch mill diameter, 0.500-inch length of cut, and 1.500-inch overall length, this tool is built for tight-tolerance work in confined cutting zones. The four-flute, right-hand spiral design with a 30-degree helix angle promotes efficient chip evacuation and stable cutting action. It is uncoated and manufactured to a C2 carbide grade, making it well-suited for use in CNC machining centers and manual mills operated by machinists and tool-and-die professionals.

This end mill is intended for regular-length slotting, profiling, and peripheral milling operations on ferrous and non-ferrous materials where a small-diameter, high-precision tool is required. The centercutting geometry allows for direct plunge entry, expanding its utility in pocketing operations. The straight cylindrical shank fits standard collet systems without modification. It is a single-end tool from the ROBBJACK NR-404 series, designed for shops requiring consistent dimensional accuracy at the 1/8-inch diameter range.

Key Features

• Solid carbide construction to C2 material grade for rigidity and wear resistance
• Four-flute, right-hand spiral configuration with 30-degree helix angle
• Centercutting geometry supports direct plunge and pocketing operations
• Uncoated finish suitable for applications where coating is not required or desired
• Straight cylindrical shank compatible with standard collet and end mill holders
• Mill diameter tolerance of plus 0.001 / minus 0.000 inches for consistent fit and finish

Compatibility

Designed as an OEM-style replacement or direct-use solid carbide square end mill for standard collet systems accepting a 0.125-inch straight cylindrical shank, typical of CNC machining centers and manual milling machines in the NR-404 series application range.

Installation Notes

Installation and tool changes should be performed by a qualified machinist with the spindle fully stopped and power isolated. Ensure the collet or end mill holder is clean and free of debris before seating the shank. Verify runout with a dial indicator after clamping, as small-diameter carbide tools are sensitive to misalignment. Follow your machine tool manufacturer guidelines for recommended speeds and feeds for the material being cut.