Robbjack STR-401-16-T Roughing End Mill 0.5 in 4 Flute Carbide

Product Description

The ROBBJACK STR-401-16-T is a single-end roughing end mill designed for aggressive material removal in milling applications. Built from solid carbide in ROBBJACK's Super Tuffy material grade, it delivers the hardness and wear resistance required for high-feed roughing passes. The cutter measures 0.5 inches in diameter with a 0.625-inch length of cut and a stub-length overall length of 3 inches. A titanium nitride (TiN) coating adds surface hardness and lubricity, reducing heat buildup and extending tool life in demanding cuts. The fine-pitch, 4-flute geometry and right-hand cutting and flute direction make it a standard choice for machinists running production roughing operations.

This end mill is suited for use in CNC machining centers and manual knee mills where rapid stock removal is the priority before a finishing pass. The stub-length configuration minimizes overhang, improving rigidity and reducing deflection in interrupted cuts or tough materials. The center-cutting design allows plunge entry. It is installed and used by machinists, tool-and-die makers, and manufacturing shops working with ferrous and non-ferrous metals. The STR-401 series is a ROBBJACK production line built specifically for high-performance roughing work.

Key Features

• Solid carbide Super Tuffy material grade for hardness and wear resistance in roughing applications
• TiN coating reduces friction and heat, extending tool life on production runs
• 4-flute fine-pitch geometry optimized for aggressive stock removal
• Center-cutting capable, allowing direct plunge entry without a pilot hole
• Stub-length body minimizes deflection and improves rigidity at the spindle
• Right-hand cut and right-hand flute direction for standard CNC and manual mill spindles

Compatibility

Designed as an OEM-style replacement or direct-fit roughing end mill for standard 0.5-inch collets, end mill holders, and hydraulic chucks used in CNC machining centers and manual milling machines.

Installation Notes

Installation is performed by machinists using an appropriate end mill holder or collet chuck rated for the 0.5-inch shank diameter. Confirm shank seating depth and runout before initiating a cut. Power down and lock out the spindle before changing tooling. Observe the shank diameter tolerance of -0.0001 to -0.0002 inches when selecting the holder to ensure proper fit and concentricity.