🔍 An **O-flute bit** is a type of router end mill with a single large flute that’s shaped to quickly eject chips and prevent material from melting or sticking. They are often called single-flute bits. You’d use an O-flute primarily for **plastics and soft metals like aluminum**. These materials can melt or “weld” to the cutter if it gets too hot. The O-flute’s geometry helps carry heat away with the chip, keeping the cut cool:contentReference[oaicite:77]{index=77}. For example, when cutting acrylic, an O-flute produces nice spirals of plastic instead of gooey re-melt. When cutting aluminum, the single flute gives the chip plenty of room to clear and reduces rubbing. Basically, if you’re working with anything gummy (ABS, HDPE, acrylic, brass, aluminum), an O-flute bit is a fantastic choice. SpeTool’s O-flute bits are designed for smooth finishes in plastics and non-ferrous metals and are often SPE-X coated for longer life:contentReference[oaicite:78]{index=78}. In short, use O-flutes for plastics and aluminum to get cleaner, cooler cuts and to stop chips from rewelding into the cut.

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