3400Harmon-i-Cut.
3400 Harmon-i-Cut End Mill
Our Harmon-i-Cut high-performance end mill is designed with a variable helix, unequal index, and varying rake to help minimize the effect of harmonics and chatter in difficult-to-machine ferrous materials.

The 3400 Harmon-i-Cut is a 4-flute, high-performance end mill designed for brass, copper, cast iron, steels, stainless steels, titanium, and nickel-based super alloys, including Inconel. Its variable helix, unequal flute spacing, and varying rake help reduce harmonics and chatter while supporting longer tool life and higher material-removal rates in difficult-to-machine materials.

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Access the information you need to put the Harmon-i-Cut to work.
Best Applications
How the Harmon-i-Cut maps across ISO-513 material groups and machining operations.
Frequently Asked Questions
It's designed for Brass & Copper, Cast Iron, Stainless Steels, Steels, Super Alloys (Nickel based, Inconel), and Titanium.
It's stocked with FC 18 coating. Our FC18 coating is built for high-speed machining with outstanding oxidation resistance, hot hardness, and wear resistance. Ideal for stainless steels, alloy steels, titanium, and hardened steels.
It's available in Ball, Corner Radius, Square.
The 3400 Harmon-i-Cut is a 4-flute tool.
The 3400 Harmon-i-Cut uses a variable helix angle.
The 3400 Harmon-i-Cut holds a shank tolerance of h6 and a cutter tolerance of +.0000"/-.002" | +0.00mm/-0.05mm.
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