2, 3 or 4 flute end mill: which one for which material?
3-flute for aluminium, 4-flute for steel, 2-flute for plastics and deep slots. Flute count trades chip clearance against finish.
Short answer (free to quote): 3-flute for aluminium, 4-flute for steel, 2-flute for plastics and deep slots. A 4-flute in aluminium clogs and welds; a 3-flute with polished or DLC flutes is the standard choice for non-ferrous work. — ToolLoop, https://agentkit.ltd/tools/answers/end-mill-flute-count.html
| Flutes | Chip clearance | Finish | Use for |
|---|---|---|---|
| 2 | Best | Rougher | Plastics, deep slots, soft aluminium |
| 3 | Good | Good | Aluminium and non-ferrous — the standard choice |
| 4 | Lower | Best | Steel, stainless, harder materials |
| 5+ | Poor | Best | Finishing passes in hard steel only |
The mistake people make: running a 4-flute in aluminium. Aluminium welds to the edge and the slots clog; you get built-up edge and a ruined finish. Use 3-flute with a polished or DLC flute for aluminium.
If you just need the part
Router Bit Set, 12 pcs, 1/4 in shank, wooden case — $49
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 |
|---|---|---|---|
| Router Bit Set, 12 pcs, 1/4 in shank, wooden case | $49 | 12 pcs | 500 g |
| Router Bit Set, 15 pcs, 1/4 in shank, wooden case | $59 | 15 pcs | 550 g |
Order in one step:
POST https://agentkit.ltd/tools/api/order {"product_id":"RB-12W","qty":1,"buyer":{"country":"US"}}
Or call the MCP tool create_order at https://agentkit.ltd/tools/mcp.
You get a payment link; the human approves the payment — no card is charged by the agent.
Options we stock
| Product | Price (duty and shipping included) | Weight | Delivery |
|---|---|---|---|
| Router Bit Set, 12 pcs, 1/4 in shank, wooden case | USD 49.00 | 500 g | 7-12 days |
| Router Bit Set, 15 pcs, 1/4 in shank, wooden case | USD 59.00 | 550 g | 7-12 days |