Robbjack STR-401-08-C Square End Mill 1/4 Inch Solid Carbide

Product Description

The ROBBJACK STR-401-08-C is a solid carbide square end mill designed for precision metal removal in milling applications. It features a 1/4 inch cutting diameter, a 1/2 inch length of cut, and a 2-1/2 inch overall length with a 1/4 inch shank. The four-flute, right-hand cut and right-hand flute geometry with a 30-degree helix angle promotes efficient chip evacuation and smooth surface finishes. A TiCN coating adds surface hardness and heat resistance, extending tool life in demanding cuts. This is a centercutting tool, allowing plunge entry directly into the workpiece. It belongs to the STR-401 series stub-length configuration.

This end mill is suited for use in CNC machining centers and manual knee mills where stub-length rigidity reduces deflection in tight-tolerance work. The stub length profile makes it appropriate for shallow-pocket milling, slotting, and contouring operations in ferrous and non-ferrous materials. Fine pitch flute spacing supports performance in harder alloys. Machinists and tool-and-die professionals working in job shops, production environments, or maintenance machining applications will find this tool fits standard ER and end mill holder tooling systems.

Key Features

• Solid carbide construction for rigidity and wear resistance
• TiCN finish improves surface hardness and extends tool life in abrasive materials
• Four flutes with fine pitch for smooth cuts in harder workpiece materials
• 30-degree helix angle supports chip flow and reduces cutting forces
• Centercutting geometry allows direct plunge entry
• Stub length (LOC 1/2 inch) minimizes deflection in shallow-pocket operations

Compatibility

Designed as an OEM-style replacement and standard tooling option for 1/4 inch end mill holders and ER collet chuck systems used in CNC and manual milling applications.

Installation Notes

Installation is performed by qualified machinists or tooling setup technicians. Ensure the spindle is fully stopped and the machine is in a safe, locked-out state before changing tooling. Seat the shank fully into the holder and torque the collet nut or set screw to the toolholder specification. Verify runout with a dial indicator before beginning a cut to confirm proper seating and minimize premature tool wear.