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半月鍵（Woodruff Key｜S45C 碳鋼），依據 JIS B 1301 製作，具弧形結構，適用於需自對準的圓軸鍵結應用

Woodruff Keys（Half-Moon Keys｜JIS B 1301）

Woodruff Keys are semi-circular keys designed for secure rotational alignment between shafts and hubs. Manufactured in accordance with JIS B 1301 standards, these keys are widely used in motor drives, mechanical modules, and precision transmission systems. Their curved profile allows for self-aligning installation and improved torque transmission compared to standard rectangular keys.

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Product Features

  • Self-Aligning Design：Half-moon shape ensures precise shaft-hub engagement and eliminates backlash.

  • Secure Fit：Ideal for round shafts and curved keyways; prevents loosening during high-speed rotation.

  • Reliable Torque Transmission：Withstands axial and torsional loads; improves equipment durability.

  • Machining Advantage：Stable hardness and excellent machinability for fast installation.

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Material & Surface Treatment

  • S45C Medium Carbon Steel
    Standard material with optional heat treatment (HRC 20–45), suitable for general mechanical use.

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Size Range

  • Width (b)：3mm to 12mm

  • Height (h)：2mm to 8mm

  • Radius (R)：Standard radius per JIS; custom sizes available upon request

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Applications

  • Shaft locking and anti-rotation components

  • Electric motors and servo drive systems

  • Spindles, transmission shafts, and eccentric assemblies

  • High-precision gearboxes and self-lubricating bearings

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Customization & Notes

  • Custom dimensions and non-standard radii available

  • Coating or heat treatment options upon request

  • Full support for drawing review, sample confirmation, and production scaling

  • Assistance with shaft-keyway compatibility check and selection guide

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