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End Mills, 4 Flute, M42 Cobalt, Coated, Individual Sizes

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$29.97 $49.95 In stock

These are high quality, American made, cobalt end mills for general milling operations including slots, grooves and other similar features.

They are ground from solid M42 8% cobalt steel. The cutting areas are either Titanium Nitride (TiN) or Titanium CarboNitride (TiCN) coated.

These CNC qualified end mills feature a spiral flute design for a faster and smoother cutting action.

Flute length and overall length vary, see Specifications.

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Standard Shipping: Handling (business days) 0–1; Transit (business days) 7–15.

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Express Shipping · United States: $3.99

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United States · Return window (days after delivery): 30. Return method: By mail. Return postage: Seller pays.

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Customer Reviews (4.2 / 5 · 5 reviews)

Jason C. ★★★★★

I was pleasantly surprised by how cleanly these 4-flute end mills cut through a tricky slotting job on stainless steel. The M42 cobalt material held its edge noticeably longer than the standard HSS bits I’ve been using. Definitely my new go-to for precision grooves.

Mia Y. ★★★★★

The coated finish on these has survived some serious hogging cuts without any chatter marks, and the 4-flute geometry clears chips exactly as it should. I’ve run them through a dozen slots in 4140 so far, and the edges still look factory fresh.

Eli M. ★★★★★

The M42 cobalt steel really does hold an edge longer than standard HSS bits—I finished a batch of slots in stainless without any chatter or premature wear. The coating also seems to keep the flutes from loading up. For the price, these are my go-to for general milling now.