Robbjack NR-204-20 Square End Mill 5/8 in 2 Flute Carbide

Product Description

The ROBBJACK NR-204-20 is a 2-flute solid carbide square end mill designed for precision milling of ferrous and non-ferrous materials in machining centers and manual mills. It carries a 5/8 inch cutting diameter with a 1-1/4 inch length of cut, a matching 5/8 inch shank diameter, and a 3-1/2 inch overall length. The 30-degree spiral helix and right-hand cut geometry promote efficient chip evacuation and stable cutting action. The uncoated solid carbide construction in material grade C2 delivers the rigidity needed for close-tolerance work in production and toolroom environments.

The NR-204-20 belongs to RobbJack's NR-204 series, which targets regular-length general-purpose milling applications. Its centercutting capability allows both peripheral and plunge cutting, making it suitable for slotting, profiling, and pocket milling. This end mill is sized for setups where a 5/8 inch shank interfaces with standard R8, CAT, BT, or HSK toolholders. It is a single-end tool intended for use in CNC machining centers, knee mills, and similar equipment by machinists and toolroom technicians.

Key Features

• Solid carbide C2 grade construction for rigidity and wear resistance in close-tolerance cuts
• 2-flute geometry provides chip clearance and suits slotting and full-width cuts
• 30-degree helix angle promotes smooth cutting action and efficient chip flow
• Centercutting design allows direct plunge entry without pre-drilling
• Right-hand cut and right-hand flute orientation for standard spindle operation
• Uncoated finish - compatible with cutting fluids and re-coating if required

Compatibility

Designed as an OEM-style replacement and standard production tooling option for 5/8 inch shank toolholders used in CNC machining centers and manual milling machines requiring a regular-length 2-flute square end mill.

Installation Notes

Installation is performed by qualified machinists or CNC setup technicians. Secure the shank in a collet chuck or end mill holder to the full recommended engagement depth and verify runout with a dial indicator before cutting. Ensure the machine spindle is fully stopped and locked out before inserting or removing the tool. Follow the machine manufacturer's torque specifications for drawbar or toolholder retention hardware.