Robbjack S1-201-10 Square End Mill 5/16 in 2 Flute Carbide

Product Description

The ROBBJACK S1-201-10 is a solid carbide square end mill designed for precision milling in metalworking and machining applications. It features a 5/16-inch cutting diameter, a 1/2-inch length of cut, and a 2-1/2-inch overall length in a stub-length configuration. With 2 flutes and a 30-degree helix angle, this centercutting end mill delivers efficient chip evacuation and smooth cutting action in a compact profile. The right-hand cut and right-hand spiral flute geometry suit standard CNC and manual milling setups. This tool ships uncoated and is manufactured to tight tolerances for consistent performance in close-tolerance work.

This end mill is suited for milling slots, pockets, and contours in ferrous and non-ferrous materials on vertical machining centers, knee mills, and CNC milling machines. The stub-length body provides rigidity and reduced deflection, making it a practical choice for shallow-depth operations where tool stiffness is a priority. Licensed machinists and CNC operators working in job shops, production facilities, and toolrooms are the primary users of this style of cutter. The straight cylindrical shank fits standard ER collets and end mill holders.

Key Features

• Solid carbide construction, grade C2, for hardness and wear resistance
• 5/16-inch cutting diameter with mill diameter tolerance of +0.000 / -0.003 inches
• 1/2-inch length of cut, 2-1/2-inch overall length, stub-length series
• 2-flute spiral geometry with 30-degree helix angle for efficient chip removal
• Centercutting design allows plunge entry into workpiece
• Right-hand cut, right-hand flute, uncoated finish
• Straight cylindrical shank, 5/16-inch diameter, tolerance -0.0001 / -0.0002 inches

Compatibility

Designed for use in standard ER collet chucks and end mill holders accepting a 5/16-inch straight cylindrical shank. Part of the ROBBJACK S1-201 series of stub-length square end mills.

Installation Notes

Installation is performed by qualified machinists or CNC operators. Power down and lock out the machine spindle before inserting or removing the tool from the holder. Ensure the collet or holder bore is clean and free of chips before seating the shank. Do not exceed the recommended depth of cut or radial engagement for the tool diameter and material being machined.