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Fine Thread Spec Table
Fine Thread KS Specifications — 24 sizes
ISO 724
This specification follows ISO (International Organization for Standardization) standards. ISO ensures cross-border compatibility, making it ideal for multinational projects, export equipment design, and global parts procurement.
ISO 724 metric fine thread specifications. Finer pitch than coarse threads for vibration-prone environments and thin-walled parts. Covers major fine thread sizes from M8 to M64.
Practical Notes
- Finer pitch than coarse for the same nominal diameter — more resistant to vibration loosening. But shallower threads require attention to engagement depth.
- Used for thin-walled parts or hydraulic ports with limited wall thickness. Coarse threads may require too much wall thickness.
ISOFine Thread
24 sizes| Nominal | Pitch P (mm) | Eff. Dia d₂ (mm) | Minor Dia d₁ (mm) | Stress Area Aₛ (mm²) | Standard |
|---|---|---|---|---|---|
| M8×1 | 1 | 7.35 | 6.773 | 39.2 | ISO 724 |
| M10×1 | 1 | 9.35 | 8.773 | 64.5 | ISO 724 |
| M10×1.25 | 1.25 | 9.188 | 8.466 | 61.2 | ISO 724 |
| M12×1.25 | 1.25 | 11.188 | 10.466 | 92.1 | ISO 724 |
| M12×1.5 | 1.5 | 11.026 | 10.16 | 88.1 | ISO 724 |
| M14×1.5 | 1.5 | 13.026 | 12.16 | 125 | ISO 724 |
| M16×1.5 | 1.5 | 15.026 | 14.16 | 167 | ISO 724 |
| M18×1.5 | 1.5 | 17.026 | 16.16 | 216 | ISO 724 |
| M20×1.5 | 1.5 | 19.026 | 18.16 | 272 | ISO 724 |
| M20×2 | 2 | 18.701 | 17.546 | 258 | ISO 724 |
| M22×1.5 | 1.5 | 21.026 | 20.16 | 333 | ISO 724 |
| M24×2 | 2 | 22.701 | 21.546 | 384 | ISO 724 |
| M27×2 | 2 | 25.701 | 24.546 | 496 | ISO 724 |
| M30×2 | 2 | 28.701 | 27.546 | 621 | ISO 724 |
| M33×2 | 2 | 31.701 | 30.546 | 865 | ISO 724 |
| M36×3 | 3 | 34.051 | 31.799 | 865 | ISO 724 |
| M39×3 | 3 | 37.051 | 34.799 | 1030 | ISO 724 |
| M42×3 | 3 | 40.051 | 37.799 | 1210 | ISO 724 |
| M45×3 | 3 | 43.051 | 40.799 | 1410 | ISO 724 |
| M48×3 | 3 | 46.051 | 43.799 | 1590 | ISO 724 |
| M52×3 | 3 | 50.051 | 47.799 | 1890 | ISO 724 |
| M56×4 | 4 | 53.402 | 50.546 | 2160 | ISO 724 |
| M60×4 | 4 | 57.402 | 54.546 | 2520 | ISO 724 |
| M64×4 | 4 | 61.402 | 58.546 | 2900 | ISO 724 |
FAQ
What is M10 fine thread pitch?
1.25mm or 1.0mm. Fine threads have multiple pitch options — always specify on drawings (e.g., M10×1.25). Omission means coarse (M10×1.5).