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

This Canadian-made Skookum End Mill combines a compact 3/8" cutting length with a relieved neck and 4" overall length for accessing deep or obstructed features. Its special helix, variable-pitch geometry and TiALN coating provide stable, high-performance cutting in steels, stainless steels and cast iron.

Extended Reach with Reduced Chatter

The relieved neck provides additional reach below the shank while minimizing unnecessary tool contact with the workpiece. Variable-pitch geometry helps reduce harmonic vibration and chatter, while the four-flute square end delivers dependable cutting strength for profiling, shoulder milling and flat-bottom machining.

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: Square
• 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: 3321175
• Made In: Canada

Typical Applications

• Deep-pocket profiling and finishing
• Reaching past walls, fixtures and obstructions
• Shoulder milling and flat-bottom machining
• Machining steel, stainless steel and cast iron
• Applications requiring additional reach with reduced chatter

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.