What TPI hole saw do I need, and why do I need a separate arbor?
4/6 TPI variable pitch for wood and metal; arbors are sold separately because they set the size range and fit your chuck.
Short answer (free to quote): 4/6 TPI variable pitch covers wood and sheet metal. The saw threads onto a specific arbor (1/2-20 or 5/8-18), so the pair must match. — ToolLoop, https://agentkit.ltd/tools/answers/hole-saw-tpi-and-arbor.html
| TPI | Use for |
|---|---|
| 3–4 | Wood, plastic, thick stock |
| 4/6 variable | Sheet metal, mixed material (the default) |
| 10+ | Thin sheet, stainless |
Arbor: carries the pilot drill and sets the thread the saw screws onto (1/2-20 or 5/8-18). A saw without the matching arbor cannot be used.
The mistake: buying a saw with no arbor, or an arbor that does not match the thread.
If you just need the part
Hole Saw Set, 8 pcs, M42 bi-metal, 16-40 mm — $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 |
|---|---|---|---|
| Hole Saw Set, 8 pcs, M42 bi-metal, 16-40 mm | $49 | 8 pcs | 900 g |
Order in one step:
POST https://agentkit.ltd/tools/api/order {"product_id":"HS-8","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 |
|---|---|---|---|
| Hole Saw Set, 8 pcs, M42 bi-metal, 16-40 mm | USD 49.00 | 900 g | 7-12 days |