What is the actual difference between an aluminium end mill and a steel end mill?
| 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.
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 by price band: under $60 refunded without return, $60-120 partial refund, over $120 returned for inspection. Free replacement for damage in transit. 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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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 |