Robbjack SR-4-040 Square End Mill 0.04 in 4 Flute Carbide

Product Description

The ROBBJACK SR-4-040 is a solid carbide square end mill designed for precision milling in demanding machining applications. With a 0.04-inch cutting diameter and four spiral flutes, this tool delivers clean, accurate cuts in tight geometries where rigidity and edge sharpness are critical. The Tuffy material grade carbide substrate provides the hardness and wear resistance needed for production-level cutting cycles. At 1.5 inches overall length with a 0.12-inch length of cut, this mill is built for shallow-depth finishing and slotting work. It is installed and operated by machinists and CNC programmers working on precision components.

The SR-4-040 is suited for milling small features in ferrous and non-ferrous materials across precision manufacturing environments. Its right-hand cut and right-hand spiral flute geometry make it compatible with standard spindle rotation on vertical machining centers and CNC mills. The 1/8-inch straight cylindrical shank fits standard collet chucks and tool holders commonly used in high-speed machining setups. Centercutting capability allows plunge entry directly into the workpiece without pre-drilling. This tool is appropriate for production shops, tool rooms, and prototype machining operations requiring consistent performance at small diameters.

Key Features

• Solid carbide Tuffy-grade substrate for high wear resistance and edge retention
• 4-flute spiral geometry for improved surface finish and chip evacuation
• Centercutting design allows direct plunge entry into the workpiece
• Right-hand cut and right-hand flute for standard spindle compatibility
• 30-degree helix angle balances cutting forces at small diameters
• Straight cylindrical 1/8-inch shank fits standard collet and end mill holders

Compatibility

Designed as an OEM-style replacement or direct-fit tooling option for CNC machining centers and manual mills equipped with 1/8-inch collet chucks or end mill holders accepting straight cylindrical shanks.

Installation Notes

Installation should be performed by a qualified machinist or CNC setup technician. Ensure the spindle is fully stopped and the machine is in a safe, locked-out state before inserting or removing the tool from the holder. Seat the shank fully into the collet to the recommended insertion depth and torque the collet nut to the tool holder manufacturer's specification. Verify runout with a dial indicator before beginning the cut, as runout is especially critical at this diameter.