Gws 120989 Corner Radius End Mill 3/16 in 5 Flute Carbide

Product Description

The GWS 120989 is a solid carbide corner radius end mill engineered for demanding material removal in steel, stainless steel, cast iron, superalloys, titanium, and hard materials. It carries a 3/16 inch (0.1875 inch) mill diameter with a 0.005 inch corner radius and features five flutes in a right-hand spiral configuration with variable helix and variable index geometry. The short-series design and centercutting capability make it suitable for both plunge and lateral cutting operations. Licensed machinists and toolroom technicians will find this tool appropriate for roughing and finishing passes in a single setup.

The 120989 is suited for use in CNC machining centers and manual mills where precision contouring of ferrous and high-hardness workpieces is required. The submicron carbide grade and FX1 coating classification support performance in steel (P), cast iron (K), superalloys and titanium (S), and hard materials (H), with stainless steel (M) as a secondary workpiece material. The straight-cylindrical shank mounts directly into standard end mill toolholders.

Key Features

• Solid carbide submicron grade for wear resistance in ferrous and hard-material applications
• 5-flute variable helix and variable index design reduces harmonic vibration during cutting
• 0.005 inch corner radius protects cutting edge and produces controlled edge breaks on finished parts
• Centercutting geometry allows direct plunge entry without pre-drilling
• Right-hand cut, right-hand flute spiral with normal pitch for predictable chip evacuation
• Straight-cylindrical shank with h6 tolerance for secure toolholder retention

Compatibility

Designed for use with standard end mill toolholders. Primary workpiece materials include steel, cast iron, superalloys, titanium, and hard materials; secondary workpiece material is stainless steel. UNSPSC code 27112803.

Installation Notes

Installation is performed by machining professionals using end mill toolholders appropriate for a 3/16 inch straight-cylindrical shank. Ensure the toolholder bore and collet are clean and free of chips before seating the shank to the recommended engagement depth. Verify spindle direction is set to right-hand rotation before engaging the workpiece. Follow the machine tool manufacturer guidelines and applicable shop safety procedures when setting tool offsets and runout.