Robbjack NR-404-16.5 Square End Mill 33/64 in 4 Flute Carbide

Product Description

The ROBBJACK NR-404-16.5 is a solid carbide square end mill designed for precise material removal in demanding machining applications. It features a 33/64-inch (0.5156-inch) cutting diameter with a 1-inch length of cut and a 1/2-inch straight-cylindrical shank. The 4-flute, right-hand spiral configuration with a 30-degree helix angle promotes efficient chip evacuation and smooth cutting action. This is a centercutting tool, meaning it can be plunged directly into the workpiece. At 3 inches overall length and 0.1875 pounds, it fits standard CNC machining center and manual mill setups. It is uncoated and supplied in Series NR-404 regular length.

This end mill is suited for milling operations in ferrous and non-ferrous materials where tight dimensional tolerances are required. The C2 carbide grade provides a balance of hardness and toughness appropriate for general-purpose profiling, slotting, and peripheral milling. The regular-length body keeps deflection low in typical cut depths up to 1 inch. Machinists and CNC operators in job shops, production environments, and tool rooms will find this tool appropriate for a wide range of roughing and finishing passes.

Key Features

• Solid carbide construction in C2 material grade for rigidity and wear resistance
• 4 right-hand spiral flutes with 30-degree helix angle for efficient chip evacuation
• Centercutting geometry allows direct plunge entry into the workpiece
• Uncoated finish suitable for use with or without cutting fluid
• Straight-cylindrical shank compatible with standard collets and end mill holders
• Mill diameter tolerance of plus 0.001 / minus 0.000 inches for precise fit to nominal size

Compatibility

Designed as an OEM-style replacement or direct-use solid carbide square end mill for standard 1/2-inch collet or end mill holder systems used in CNC machining centers and manual knee mills.

Installation Notes

Installation should be performed by a qualified machinist or CNC operator. Ensure the spindle is fully stopped and the machine is powered down before inserting or removing the tool from the holder. Seat the shank fully into the collet or end mill holder to the recommended engagement depth and torque the retention hardware per the toolholder manufacturer specifications. Verify runout with a dial indicator before beginning the cut to avoid premature tool wear or dimensional error.