Robbjack STR-404-12-A Square End Mill 3/8 in 4 Flute Carbide

Product Description

The ROBBJACK STR-404-12-A is a solid carbide square end mill designed for precision milling in demanding machining environments. This 4-flute, single-end tool features a 3/8 inch cutting diameter and an AlTiN (aluminum titanium nitride) coating that improves heat resistance and extends tool life in ferrous and hardened materials. The 30-degree helix angle promotes smooth chip evacuation and reduces cutting forces. With a regular-length geometry and centercutting capability, this end mill handles slotting, profiling, and plunge operations. It is specified for right-hand cut and right-hand flute direction, consistent with standard CNC and manual milling setups.

The STR-404-12-A suits ferrous and non-ferrous milling applications where tight tolerances and surface finish quality are required. Its fine pitch and regular-length configuration make it well matched to general-purpose CNC milling centers and manual knee mills. Machinists and tooling professionals working in job shops, production facilities, and maintenance environments will find this end mill appropriate for profiling, contouring, and full-slot operations in steel, stainless, and similar materials.

Key Features

• Solid carbide construction for rigidity and wear resistance in hard materials
• AlTiN coating provides high-temperature resistance and extended tool life
• 4-flute, fine pitch geometry suited to ferrous profiling and slotting
• Centercutting design allows plunge entry into workpiece
• 30-degree helix angle promotes efficient chip evacuation
• Right-hand cut, right-hand flute - compatible with standard spindle rotation

Compatibility

Designed as an OEM-style replacement or direct-use tooling for standard 3/8 inch collet or end mill holder setups on CNC machining centers and manual milling machines accepting a 3/8 inch shank diameter.

Installation Notes

Installation is performed by qualified machinists or tooling technicians. Ensure the spindle is fully powered down and the machine is in a safe lockout state before changing tooling. Seat the 3/8 inch shank fully into the collet or end mill holder and torque the retention hardware per the machine or toolholder manufacturer specifications. Verify runout with a dial indicator before engaging the cut.