Robbjack NR-204-18 Square End Mill 9/16 in 2 Flute Carbide

Product Description

The ROBBJACK NR-204-18 is a solid carbide square end mill designed for precision milling operations in metalworking and machining applications. Part of the NR-204 series, this tool features a 9/16 inch cutting diameter, a 1-1/4 inch length of cut, and a 3-1/2 inch overall length. The two-flute, right-hand spiral configuration with a 30-degree helix angle promotes efficient chip evacuation during slotting, profiling, and plunging operations. Centercutting capability allows direct plunge entry into the workpiece. The uncoated solid carbide construction with C2 material grade provides the rigidity and wear resistance needed for ferrous and non-ferrous materials at moderate cutting speeds.

This end mill is suited for use in vertical machining centers, CNC mills, and manual knee mills across job shop, toolroom, and production environments. The straight cylindrical shank with a 9/16 inch diameter seats cleanly in standard collet chucks and end mill holders. The regular-length geometry makes it a practical choice for general-purpose face milling, contouring, and slot milling where extended reach is not required. Machinists working in aerospace, automotive, mold and die, and general fabrication will find this a reliable standard-length tool for everyday cutting tasks.

Key Features

• Solid carbide construction with C2 material grade for rigidity and wear resistance
• 2-flute, right-hand cut and right-hand spiral flute design for efficient chip clearance
• 30-degree helix angle promotes smooth cutting action and reduced chatter
• Centercutting geometry allows direct plunge milling without a pre-drilled hole
• Straight cylindrical shank for reliable retention in collets and end mill holders
• Uncoated finish suitable for use across a range of workpiece materials

Compatibility

Designed as an OEM-style replacement or direct substitute for standard 9/16 inch, 2-flute solid carbide square end mills in the NR-204 series, compatible with any machine tool spindle accepting a 9/16 inch straight cylindrical shank via collet chuck or end mill holder.

Installation Notes

Installation should be performed by a qualified machinist or CNC setup technician. Ensure the machine spindle is fully powered down and the tool holder is clean and free of chips or burrs before seating the shank. Tighten the collet or set screw to the tool holder manufacturer's specified torque procedure. Verify runout with a dial indicator before initiating a cutting pass, especially in tight-tolerance applications.