Robbjack SS-2-039 Square End Mill 0.039 in 2 Flute Carbide

Product Description

The ROBBJACK SS-2-039 is a solid carbide square end mill engineered for precision micro-milling applications in metalworking and machining environments. Measuring 0.039 inches in cutting diameter with a 0.0585-inch length of cut, this stub-length tool is built for rigidity in tight-tolerance work. The 1/8-inch straight cylindrical shank and 1.5-inch overall length make it compatible with standard collet and chuck setups. Manufactured from Tuffy-grade solid carbide, this uncoated, two-flute design handles demanding cuts in ferrous and non-ferrous materials. It is typically installed and operated by machinists and CNC programmers working in production or job-shop settings.

The SS-2-039 is suited for slot milling, profiling, and pocket work in small-scale or precision components where a micro-diameter tool is required. The stub length reduces deflection, which is critical when holding tight tolerances in materials like aluminum, steel, brass, and plastics. The right-hand cut and right-hand spiral flute geometry support conventional CNC milling setups. Its centercutting capability allows plunge entry directly into the workpiece, expanding its range of usable operations without requiring a pre-drilled start hole.

Key Features

• 0.039-inch cutting diameter with plus or minus 0.0005-inch mill diameter tolerance for tight dimensional control
• Solid carbide Tuffy-grade construction for hardness and wear resistance in demanding cuts
• 2-flute spiral design promotes chip evacuation in small-diameter milling operations
• Centercutting geometry allows direct plunge entry without a pilot hole
• Stub length classification reduces tool deflection and improves rigidity at micro diameters
• Right-hand cut, right-hand flute orientation suits standard CNC milling machine setups

Compatibility

Designed as an OEM-style precision cutting tool for use in CNC machining centers and manual milling machines equipped with 1/8-inch collets or chucks accepting a straight cylindrical shank.

Installation Notes

Installation should be performed by a qualified machinist or CNC operator. Ensure the spindle is fully powered down and the machine is in a safe state before changing tooling. Secure the shank fully within the collet or chuck to the recommended grip depth to minimize runout and tool pullout risk. Verify spindle speed and feed rate parameters against the material being cut before engaging the tool.