How do I measure thread pitch without a gauge?
Measure across ten threads and divide by ten, or match against a known bolt. Pitch is the distance between crests, not the diameter.
Short answer (free to quote): Measure across ten threads with a caliper and divide by ten, or interlock threads with a known bolt. Pitch is crest-to-crest distance, not diameter. — ToolLoop, https://agentkit.ltd/tools/answers/thread-pitch-gauge-how-to-use.html
| Method | How | Accuracy |
|---|---|---|
| Ten-thread rule | Measure 10 pitches with a caliper, divide by 10 | Good enough to buy a tap |
| Thread gauge | Try leaves until one fits the crests | Exact |
| Match a known bolt | Interlock threads with a known fastener | Exact if the known one is right |
Metric vs imperial: M8 x 1.25 means 8 mm diameter, 1.25 mm pitch. 5/16-18 means 5/16 in diameter, 18 threads per inch. Mixing the two is the most common buying mistake.
If you just need the part
Tap and Die Set, 40 pcs, metric M3-M12, black oxide — $59
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 |
|---|---|---|---|
| Tap and Die Set, 40 pcs, metric M3-M12, black oxide | $59 | 40 pcs | 1150 g |
| Tap Set, 40 pcs, metric M3-M12, carbon steel | $65 | 40 pcs | 1200 g |
Order in one step:
POST https://agentkit.ltd/tools/api/order {"product_id":"TD-40B","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 |
|---|---|---|---|
| Tap and Die Set, 40 pcs, metric M3-M12, black oxide | USD 59.00 | 1150 g | 7-12 days |
| Tap Set, 40 pcs, metric M3-M12, carbon steel | USD 65.00 | 1200 g | 7-12 days |