Robbjack S1-201-08 Square End Mill 1/4 in 2 Flute Carbide

Product Description

The ROBBJACK S1-201-08 is a solid carbide square end mill designed for precision material removal in milling applications. It features a 0.25-inch cutting diameter, a 0.5-inch length of cut, and a 2-inch overall length in a stub-length configuration. With 2 flutes and a 30-degree spiral helix, this end mill delivers efficient chip evacuation and clean edge geometry. The right-hand cut and right-hand flute orientation are standard for conventional CNC and manual milling setups. Centercutting capability allows for direct plunge entry into workpiece material. This tool is intended for use by machinists and toolroom professionals in production and job-shop environments.

The S1-201-08 is suited for general-purpose milling of ferrous and non-ferrous materials in applications where a stub-length, uncoated solid carbide tool is appropriate. The 0.25-inch straight cylindrical shank fits standard 1/4-inch collets and end mill holders on CNC machining centers, knee mills, and similar equipment. The stub-length body provides added rigidity for shallow-depth cuts where tool deflection must be minimized. The uncoated finish makes it a straightforward option for applications where coating compatibility or re-coating requirements are a factor.

Key Features

• Solid carbide construction, C2 material grade, for hardness and wear resistance
• 0.25-inch cutting diameter with a tolerance of +0.000 / -0.002 inches
• 0.5-inch length of cut with 2 spiral flutes at a 30-degree helix angle
• Centercutting design allows direct plunge milling without a pilot hole
• Right-hand cut, right-hand flute - compatible with standard spindle rotation
• Stub-length OAL of 2 inches for improved rigidity in shallow-cut applications
• Straight cylindrical shank fits standard 1/4-inch collets and holders

Compatibility

Designed for use in standard 1/4-inch end mill holders, collet chucks, and milling arbors on CNC machining centers and manual knee mills. Part of the ROBBJACK S1-201 series of stub-length square end mills.

Installation Notes

Installation is performed by machinists using a compatible end mill holder or collet rated for 1/4-inch shank tooling. Ensure the machine spindle is fully stopped and power is locked out before changing tooling. Verify holder runout and torque the retention mechanism to the machine or holder specification. Inspect the cutting edges for chips or damage before each use, as carbide tooling is brittle and sensitive to improper handling.