End Mills, 4 Flute, M42 Cobalt, Individual Sizes

End Mills, 4 Flute, M42 Cobalt, Individual Sizes - View 3

End Mills, 4 Flute, M42 Cobalt, Individual Sizes - View 4

End Mills, 4 Flute, M42 Cobalt, Individual Sizes - View 5

End Mills, 4 Flute, M42 Cobalt, Individual Sizes - View 6

$12.92 ~~$17.95~~ In stock

Single end 4 flute center cut end mill ground from M42 (8%) cobalt.

Used for removing material from a workpiece and leaving a smooth finish.

The 4 flute design allows for a high feed rate as less material is removed per flute. If greater swarf removal is desired, consider one of our 2 flute end mills.

Flute length and overall length vary, see Specifications.

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

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

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Standard Shipping · United States: $0.00

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 (4.8 / 5 · 5 reviews)

Matthew Y. ★★★★★ Oct 22, 2026

The M42 cobalt really holds up—I’ve been running these at a high feed rate on some tough steel and the cut quality hasn’t faded. The 4 flute design leaves a much smoother finish than my old 2 flute bits.

Michael D. ★★★★★ Oct 21, 2026

I was a bit skeptical about the 4 flute design, but the high feed rate is real and left a much smoother finish than my old 2 flute bits. The M42 cobalt gets noticeably less hot during long runs too.

Elizabeth G. ★★★★★ Oct 20, 2026

The center cut on these made plunging into mild steel a breeze, and the M42 cobalt held its edge through a full roughing pass without any chatter. I was genuinely surprised how clean the finish came out on the side walls, so I’ll be stocking up on more sizes.