ER collet or R8 for a benchtop mill?
| R8 collet | ER collet | |
|---|---|---|
| What it holds | One tool per collet, direct in the spindle | Any shank within its range, via nut |
| Range | Fixed size per collet | ER20: 1-13 mm, ER25: 1-16 mm |
| Grip length | Short | Longer, better for side load |
| Change speed | Slow, drawbar | Fast, one nut |
| Runout | Good | Good if the nut is clean and torqued |
Practical setup: R8-to-ER20 adapter in the spindle, then one ER20 nut for every cutter. That covers 1-13 mm with five collets instead of a full R8 set.
Torque matters: an ER nut that is hand-tight will let the cutter creep. Use the specified torque, usually around 40-70 Nm for ER20.
Router Bit Set, 12 pcs, 8 mm 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, 8 mm shank, wooden case | $49 | 12 pcs | 600 g |
| Router Bit Set, 12 pcs, 1/4 in shank, wooden case | $49 | 12 pcs | 600 g |
Order in one step:
POST https://agentkit.ltd/tools/api/order {"product_id":"RB-12Z8","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, 8 mm shank, wooden case | USD 49.00 | 600 g | 7-12 days |
| Router Bit Set, 12 pcs, 1/4 in shank, wooden case | USD 49.00 | 600 g | 7-12 days |