High Performance 1/4" Four-Flute Long-Reach TiALN Ball Nose End Mill

This Canadian-made Skookum End Mill combines a ball nose cutting profile with a relieved neck and 4" overall length for machining deep contours and obstructed features. Its special helix, variable-pitch geometry and TiALN coating support stable, high-performance finishing in steels, stainless steels and cast iron.

Extended Reach for Contouring and 3D Finishing

The ball nose profile produces smooth radiused surfaces during contouring, mold work and three-dimensional machining. Its relieved neck provides additional reach below the shank, while variable-pitch geometry helps control harmonic vibration and chatter for improved stability and surface finish.

Product Specifications

• Performance Series: High Performance
• Tool Style: Long-Reach Neck Relief
• Cutting Diameter: 1/4"
• Number of Flutes: 4
• Length of Cut: 3/8"
• Length Below Shank: 2-1/2"
• Overall Length: 4"
• Shank Diameter: 1/4"
• Neck Diameter: .2400"
• Shank Style: Round
• End Style: Ball Nose
• End Configuration: Single End
• Coating: TiALN (Titanium Aluminum Nitride)
• Helix: Special Helix Design
• Pitch: Variable Pitch to Reduce Chatter
• Material: 10% Micro-Grain Carbide
• Diameter Tolerance: +0.0000"/-0.0020"
• Model: 3321199
• Made In: Canada

Typical Applications

• Deep-pocket contouring and finishing
• Three-dimensional machining and mold work
• Machining radiused grooves and curved surfaces
• Reaching past walls, fixtures and obstructions
• Machining steel, stainless steel and cast iron

Why Choose Skookum End Mills?

Skookum End Mills are made in Canada from premium micro-grain carbide for consistent performance, dependable accuracy and professional-quality results. Backed by more than 25 years of cutting tool experience, they are built to meet the everyday demands of machinists, fabricators and production shops.