Robbjack STR-301-24-C Square End Mill 3/4 in 3 Flute Carbide

Product Description

The ROBBJACK STR-301-24-C is a solid carbide square end mill designed for precision metal removal in milling operations. It features a 3/4 inch cutting diameter, a 1 inch length of cut, and a 4 inch overall length with a 3/4 inch shank diameter. The three-flute, right-hand cut and right-hand flute geometry delivers efficient chip evacuation and a clean finish. A TiCN coating provides elevated hardness and wear resistance, extending tool life in ferrous and non-ferrous applications. The 30-degree helix angle balances cutting force with surface finish quality. This end mill is centercutting, allowing plunge entry directly into the workpiece.

The STR-301-24-C is suited for general-purpose milling in machine shops running vertical and horizontal CNC machining centers or manual knee mills. Its stub-length profile and fine-pitch flute configuration make it well-matched for finishing passes and light-to-moderate slotting and profiling operations. The solid carbide construction performs in harder workpiece materials where high-speed steel tooling falls short. It is installed and operated by machinists and CNC programmers in job shops, production facilities, and toolrooms.

Key Features

• 3/4 inch cutting diameter with 1 inch length of cut for controlled material engagement
• Solid carbide construction for rigidity and wear resistance in demanding materials
• TiCN coating increases surface hardness and reduces tool wear
• 30-degree helix angle balances cutting forces and improves surface finish
• Centercutting design allows direct plunge milling without a pre-drilled entry point
• Fine-pitch, right-hand flute geometry with stub-length profile for stability in short-reach setups

Compatibility

Designed as an OEM-style solid carbide square end mill for use in standard 3/4 inch collet chucks, end mill holders, and hydraulic or shrink-fit toolholders on CNC and manual milling machines.

Installation Notes

Installation is performed by a qualified machinist or CNC operator. Ensure the spindle is fully stopped and the machine is in a safe, locked-out state before changing tooling. Seat the shank fully into the holder and torque the retention mechanism to the toolholder specification. Verify runout with a dial indicator before beginning a cut to protect both the tool and the workpiece.