Woodruff Keys

Woodruff keys, sometimes called Half-Moon Keys, are semicircular shaped keys, such that, when installed into a semi-circular pocket keyway in a shaft, they leave a protruding tab.. They are used to improve the concentricity of the shaft and the mating part, which is critical for high speed operation. They are called “keys” because they lock a component to the shaft by means of a corresponding keyway in a shaft.

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Woodruff Keys Diameters

Woodruff Keys are available on the FCH Network with Imperial/US diameters that range from #3 to 4 and with Metric diameters that range from M1 to M14.

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US/Imperial diameters
Metric diameters
Woodruff Keys Lengths

Woodruff Keys are available on the FCH Network with lengths that range from 1/4 to 2 7/8.

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US/Imperial lengths
Metric lengths
Woodruff Keys Materials

Woodruff Keys are available on the FCH Network in materials that range from Steel to Superalloy (Inconel, Hastelloy, Alloy 20)

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Woodruff Keys Finishes

Woodruff Keys are available on the FCH Network in finishes or coatings that range from Plain to Nickel

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