Robbjack STR-404-20-T Square End Mill 5/8 Inch 4 Flute

Product Description

The ROBBJACK STR-404-20-T is a solid carbide square end mill designed for precision material removal in ferrous and non-ferrous machining applications. Part of the STR-404 series, this centercutting tool features a 5/8-inch cutting diameter, a 1-1/4-inch length of cut, and a 4-flute configuration with a fine pitch and 30-degree helix angle. The TiN (titanium nitride) finish improves surface hardness and extends tool life in production environments. The 5/8-inch shank provides solid grip in standard collet and end mill holders. Machinists and CNC operators install and run this tool in vertical mills, machining centers, and manual knee mills.

This end mill is suited for slotting, profiling, and peripheral milling operations in regular-reach setups. The regular length profile and 3-1/2-inch overall length make it a practical choice for general-purpose work where extended reach is not required. The right-hand cut and right-hand flute geometry are standard for conventional and climb milling on most machine tool spindles. It is appropriate for use in job shops, production floors, and tool rooms handling a range of materials.

Key Features

• Solid carbide construction for rigidity and wear resistance
• TiN finish for improved hardness and extended tool life
• 4-flute fine-pitch design for smooth finish cuts
• 30-degree helix angle for efficient chip evacuation
• Centercutting geometry allows plunge entry into the workpiece
• Right-hand cut and right-hand flute - compatible with standard spindle direction

Compatibility

Designed as a standard-shank square end mill for use in 5/8-inch collets, end mill holders, and hydraulic or shrink-fit tooling systems compatible with a 5/8-inch shank diameter.

Installation Notes

Installation should be performed by a qualified machinist following the machine tool manufacturer's guidelines. Ensure the spindle is fully stopped and locked out before changing tooling. Seat the shank fully in the holder and torque the retention screw or collet nut to the holder manufacturer's specification. Inspect the cutting edges for chipping before each use and confirm runout is within acceptable limits for the intended operation.