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Width Width |
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Overall Length Overall Length |
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Minimum Hardness Minimum Hardness |
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For Keyway Diameter For Keyway Diameter |
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Key Number Key Number | Show |
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Key Number Key Number | Hide |
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REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration,Evaluation, Authorization and Restriction of Chemicals) |
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RoHS (Restriction of Hazardous Substances) RoHS (Restriction ofHazardous Substances) |
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Specifications Met Specifications Met |
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DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense AcquisitionRegulations Supplement) |
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For Maximum Keyway Diameter Tolerance For Maximum KeywayDiameter Tolerance |
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For Minimum Keyway Diameter Tolerance For Minimum KeywayDiameter Tolerance |
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Key Type Key Type |
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![]() | Woodruff |
Woodruff Keys


Side View
Woodruff keys work well near shaft shoulders, where a standard open keyway would create too much stress. They are also often used on tapered shafts. These keys have a rounded shape that makes them easy to remove when parts need to be taken apart frequently, such as for maintenance or prototyping. Because they're usually shorter than standard machine keys, they work best in light duty applications. Use them to connect gears and other components to shafts. Also known as half moon keys.
Steel keys offer good strength.
Inch keys conform to ANSI B17.2 standards for dimensions and tolerances.
For technical drawings and 3-D models, click on a part number.