قواطع نهاية، 4 أسنان، كوبالت M42، مطلية، مقاسات فردية

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.

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.

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.