Robbjack STR-303-08-C Square End Mill 1/4 Inch 3 Flute

Product Description

The ROBBJACK STR-303-08-C is a solid carbide square end mill designed for precision milling in metalworking and machining applications. With a 1/4 inch cutting diameter, 3/4 inch length of cut, and 3 flutes, this tool delivers clean, accurate cuts in a compact form factor. The TiCN (Titanium Carbonitride) coating improves wear resistance and extends tool life compared to uncoated carbide. A 30-degree helix angle promotes efficient chip evacuation and smooth cutting action. This end mill is centercutting, allowing direct plunge entry into the workpiece. It is sized for use in CNC machining centers, manual mills, and other standard milling setups requiring a 1/4 inch shank.

This end mill is suited for shops and machinists working with ferrous and non-ferrous metals, plastics, and composites in both production and prototype environments. The fine pitch and right-hand cut with right-hand flute configuration make it a standard choice for conventional and climb milling passes. The regular length profile fits tight-clearance setups without requiring extended reach. It is well suited for slotting, profiling, and contouring operations where a 1/4 inch tool is specified.

Key Features

• Solid carbide construction for rigidity and wear resistance
• TiCN coating extends tool life and reduces friction at the cutting edge
• 3 flutes with fine pitch for balanced chip load in a variety of materials
• 30-degree helix angle promotes efficient chip evacuation
• Centercutting geometry allows direct plunge milling
• Right-hand cut, right-hand flute - standard configuration for most milling setups

Compatibility

Designed as an OEM-style replacement or direct-use solid carbide square end mill for standard 1/4 inch collet and end mill holders used in CNC and manual milling machines.

Installation Notes

Installation is performed by qualified machinists or CNC setup technicians. Secure the shank fully in a clean, properly sized collet or end mill holder and torque the retention mechanism per the toolholder manufacturer specifications. Inspect the cutting edges for chips or damage before each use. Never exceed the recommended speed and feed parameters for the workpiece material and tool diameter.