Robbjack NR-404-18 Square End Mill 9/16 in 4 Flute Carbide

Product Description

The ROBBJACK NR-404-18 is a solid carbide square end mill designed for precision metal removal in milling operations. Built to Series NR-404 standards, this single-end tool features a 9/16 inch cutting diameter, four spiral flutes with a 30-degree helix angle, and a right-hand cut with right-hand flute orientation. The centercutting geometry allows plunge entry as well as peripheral and slot milling. Uncoated C2 carbide construction provides a sharp, consistent edge suitable for a range of ferrous and non-ferrous materials. Licensed machinists and CNC operators are the primary installers of this tooling.

This end mill is suited for general-purpose milling in job shop, production, and maintenance machining environments. The regular length profile and 9/16 inch shank diameter make it compatible with standard collet chucks, end mill holders, and milling machine spindles. Typical applications include slotting, profiling, and peripheral milling on knee mills, VMCs, and HMCs where a 9/16 inch diameter tool path is required.

Key Features

• Solid carbide construction, C2 material grade, for rigidity and wear resistance
• 4 spiral flutes with 30-degree helix angle for efficient chip evacuation
• Centercutting design allows plunge cutting and slot entry
• Right-hand cut, right-hand flute configuration for standard spindle rotation
• Uncoated finish maintains a precise, sharp cutting edge out of the box
• Regular length profile for stable, low-deflection cuts in standard-depth applications

Compatibility

Designed as an OEM-style replacement or direct-use solid carbide end mill for standard 9/16 inch collet chucks and end mill holders used in vertical and horizontal milling machine setups.

Installation Notes

Installation is performed by qualified machinists following shop tooling procedures. Ensure the spindle is fully stopped and locked out before inserting or removing the end mill from the holder. Seat the shank fully into the collet or holder to the recommended engagement depth before torquing the retention hardware. Verify runout with a dial indicator after installation and before beginning a cut to confirm proper seating.