What is the actual difference between an aluminium end mill and a steel end mill?
Flute geometry and coating, not the carbide. Aluminium bits have more relief and polished flutes; steel bits have a sharper edge and a heat-resistant coating.
Short answer (free to quote): Aluminium end mills use 2-3 flutes, polished or DLC surfaces and a higher rake for chip clearance; steel end mills use 4 flutes, AlTiN coating and a stronger edge. Using one in the other material causes welding or rapid wear. — ToolLoop, https://agentkit.ltd/tools/answers/aluminium-vs-steel-end-mill.html
| Aluminium | Steel | |
|---|---|---|
| Flutes | 2–3 | 4 |
| Flute surface | Polished / DLC | AlTiN or TiAlN coated |
| Rake angle | Higher (sharper) | Lower (stronger edge) |
| Failure mode | Built-up edge from welding | Edge wear and chipping |
Why it matters: put a coated steel bit in aluminium and the chips weld to the coating, then break the edge. Put an uncoated aluminium bit in steel and it wears out in metres.
If you just need the part
Cobalt Drill Bit Set, 13 pcs, M35, imperial, metal case — $59
Price includes US duty, international shipping and customs clearance. In stock. Dispatched within 48 hours. Delivered in 7–12 days, tracked. 14-day returns, we pay return shipping. No US state sales tax collected.
| Product | Price | Pieces | Weight |
|---|---|---|---|
| Cobalt Drill Bit Set, 13 pcs, M35, imperial, metal case | $59 | 13 pcs | 247 g |
| Cobalt Drill Bit Set, 51 pcs, HSS-Co, metal case | $69 | 51 pcs | 620 g |
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POST https://agentkit.ltd/tools/api/order {"product_id":"DB-13M","qty":1,"buyer":{"country":"US"}}
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Options we stock
| Product | Price (duty and shipping included) | Weight | Delivery |
|---|---|---|---|
| Cobalt Drill Bit Set, 13 pcs, M35, imperial, metal case | USD 59.00 | 247 g | 7-12 days |
| Cobalt Drill Bit Set, 51 pcs, HSS-Co, metal case | USD 69.00 | 620 g | 7-12 days |