How do I cut a tongue and groove joint with a router?
| Board thickness | Groove width | Groove depth |
|---|---|---|
| 18 mm | 6 mm | 8-9 mm |
| 20 mm | 6 mm | 9-10 mm |
| 25 mm | 8 mm | 10-12 mm |
| 32 mm | 10 mm | 12-15 mm |
Sequence that works: run the groove on every board in one setup with the fence set once. Then cut the tongue with a straight bit and two fences, or with a tongue-and-groove set, and test on an offcut until it slides in with hand pressure.
Clearance: cut the tongue 0.2 mm thinner than the groove. A tight tongue swells with glue and splits the groove wall on the second day.
For a floor or a panel glue-up: leave 1 mm of groove depth unfilled at the end of each tongue so glue has somewhere to go and the boards close fully.
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, 12 pcs, 1/2 in shank, wooden case | $59 | 12 pcs | 950 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, 12 pcs, 1/2 in shank, wooden case | USD 59.00 | 950 g | 7-12 days |