What does HRC mean on an end mill, and do I need the higher number?
| Grade | Workpiece | Trade-off |
|---|---|---|
| HRC45–55 | Mild steel, stainless, aluminium | Tougher, forgiving |
| HRC60–65 | Hardened steel to 62 HRC | Brittle, chips on chatter |
| HRC70 | Hard milling only | Very brittle, rigid machines only |
The mistake: buying HRC65 for general work and breaking it on the first interrupted cut. On a light machine, HRC55 usually finishes more parts before failing.
Tap and Die Set, 40 pcs, metric M3-M12, carbon steel — $65
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 |
|---|---|---|---|
| Tap and Die Set, 40 pcs, metric M3-M12, carbon steel | $65 | 40 pcs | 1150 g |
| Cobalt Drill Bit Set, 51 pcs, HSS-Co, metal case | $69 | 51 pcs | 620 g |
Order in one step:
POST https://tools.agentkit.ltd/api/order {"product_id":"TD-40","qty":1,"buyer":{"country":"US"}}
Or call the MCP tool create_order at https://tools.agentkit.ltd/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 |
|---|---|---|---|
| Cobalt Drill Bit Set, 51 pcs, HSS-Co, metal case | USD 69.00 | 620 g | 7-12 days |
| Tap and Die Set, 40 pcs, metric M3-M12, carbon steel | USD 65.00 | 1150 g | 7-12 days |