Robbjack S1-301-03 Square End Mill 3/32 in Solid Carbide

Product Description

The ROBBJACK S1-301-03 is a solid carbide square end mill designed for precision milling in metal, composites, and other hard materials. It features a 3/32-inch cutting diameter, three spiral flutes, and a 30-degree helix angle that promotes efficient chip evacuation and smooth cutting action. The stub-length geometry keeps the tool rigid, reducing deflection during aggressive cuts. This uncoated carbide tool is suited for machinists, tool-and-die professionals, and CNC operators working in job shops or production environments where tight tolerances and consistent tool geometry are required.

The S1-301-03 is built for light-to-medium milling operations where small-diameter precision tooling is needed. Its centercutting capability allows direct plunge entry into the workpiece without pre-drilling. The straight cylindrical shank fits standard collets sized for 1/8-inch shank tooling, making it compatible with a wide range of CNC machining centers and manual mills. This tool is well suited for slotting, profiling, and contouring passes in tight workpiece features where larger tools cannot reach.

Key Features

• Solid carbide C2-grade construction for hardness and wear resistance
• 3/32-inch cutting diameter with a 3/16-inch length of cut for small-feature work
• Three right-hand spiral flutes at 30-degree helix for effective chip removal
• Centercutting design allows direct plunge without pre-drilled entry hole
• Stub-length body reduces deflection and improves rigidity in short-reach applications
• Uncoated finish suitable for use across a range of base materials

Compatibility

Designed as an OEM-style replacement or direct-use solid carbide square end mill within the ROBBJACK S1-301 series, fitting standard 1/8-inch straight cylindrical collet toolholders on CNC machining centers and manual milling machines.

Installation Notes

Installation should be performed by a qualified machinist following shop safety procedures. Ensure the machine spindle is fully stopped and locked out before inserting or removing the tool from the collet. Use a calibrated torque wrench and the collet manufacturer's recommended seating depth to secure the shank without over-clamping. Verify runout with a dial indicator after installation, as small-diameter carbide tools are sensitive to collet concentricity errors.