メートルねじとインチねじの種類、ピッチの違い、互換性ルール、正しいねじの指定方法を理解する。
Metric vs Imperial Thread Systems
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| Metric Size | Pitch (mm) | Imperial Equivalent | TPI | Compatible? |
|---|---|---|---|---|
| M6 | 1.0 | 1/4" | 20 | No |
| M8 | 1.25 | 5/16" | 18 | No |
| M10 | 1.5 | 3/8" | 16 | No |
| M12 | 1.75 | 1/2" | 13 | No |
| M16 | 2.0 | 5/8" | 11 | No |
Coarse Thread vs Fine Thread
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| Size | Coarse Pitch | Fine Pitch | Coarse Tensile Area (mm²) | Fine Tensile Area (mm²) |
|---|---|---|---|---|
| M8 | 1.25 | 1.0 | 36.6 | 39.2 |
| M10 | 1.5 | 1.25 | 58.0 | 61.2 |
| M12 | 1.75 | 1.25 | 84.3 | 92.1 |
| M16 | 2.0 | 1.5 | 157 | 167 |
| M20 | 2.5 | 1.5 | 245 | 272 |
How to Specify Threads Correctly in Procurement
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How can I identify whether an existing bolt is metric or imperial?
Use a thread gauge (also called a screw pitch gauge) to measure the thread pitch. If the pitch matches a metric value (e.g., 1.5mm), it's metric. If it matches a TPI value (e.g., 16 threads per inch), it's imperial. Calipers can confirm the nominal diameter.
Can I use a helicoil to convert imperial threads to metric?
Yes, helicoil inserts can repair damaged threads or convert between thread systems in non-structural applications. However, for structural connections, thread conversion is not recommended — use the original thread specification.
よくある質問
See frequently asked questions below.
What are Technical Guide and how are they used?
Technical Guide are essential components in construction and manufacturing. Proper selection depends on load requirements, environmental conditions, and material compatibility.
How do I choose the right fastener for my project?
Consider the material being fastened, load requirements, environmental exposure, and applicable standards. Consult with a professional if unsure about specifications.
What materials are available for these fasteners?
Common materials include carbon steel, stainless steel, alloy steel, and specialty alloys. Each offers different strength, corrosion resistance, and cost characteristics.
Do you offer custom manufacturing?
Yes, we offer custom fastener manufacturing to spec. Contact our sales team with your requirements for pricing and lead times.
Need help specifying the right thread type? Contact TradeGo Fasteners for expert guidance.
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