Robbjack STR-404-16-T Square End Mill 1/2 in 4 Flute Carbide

Product Description

The ROBBJACK STR-404-16-T is a solid carbide square end mill designed for precision milling operations in metalworking and machining environments. This single-end tool features a 0.5-inch cutting diameter, a 1-inch length of cut, and a 30-degree helix angle that promotes efficient chip evacuation and smooth cutting action. A TiN (titanium nitride) finish extends tool life by increasing surface hardness and reducing friction. With four flutes in a fine-pitch configuration, the STR-404-16-T delivers a strong combination of material removal rate and finish quality. It is centercutting, allowing plunge entry into workpieces. Licensed machinists and toolroom professionals are the primary installers and operators of this tool.

The STR-404-16-T is suited for milling ferrous and non-ferrous metals in standard-reach applications. Its 0.5-inch shank diameter and 3-inch overall length make it compatible with common ER and end mill holders used in vertical machining centers, CNC mills, and manual knee mills. The right-hand cut and right-hand flute configuration is the standard orientation for the majority of spindle setups in production and job-shop environments. The regular-length body keeps deflection low in typical slotting, profiling, and peripheral milling operations.

Key Features

• Solid carbide construction provides rigidity and wear resistance superior to high-speed steel
• TiN finish increases surface hardness and reduces built-up edge during cutting
• 30-degree helix angle promotes efficient chip evacuation and reduces cutting forces
• Centercutting design allows direct plunge milling without a pre-drilled pilot hole
• Fine-pitch, four-flute configuration balances material removal with surface finish quality
• Right-hand cut and right-hand flute geometry matches standard CNC and manual mill spindle rotation

Compatibility

Designed as an OEM-style solid carbide square end mill for use with standard 0.5-inch end mill holders, collet chucks, and ER collet systems on CNC machining centers and manual milling machines.

Installation Notes

Installation is performed by a qualified machinist or CNC operator. Ensure the machine spindle is fully stopped and locked out before inserting or removing the end mill from the holder. Use a calibrated torque wrench on set-screw holders to secure the shank without crushing the carbide. Verify runout with a dial indicator after clamping, as excessive runout accelerates tool wear and degrades surface finish.