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BS 4235-2 Standard Dimensions for Woodruff Keys

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Woodruff keys and keyway

This norm provides details such as the relationship to be observed between the diameter of the shaft and the section of the key for both torque transmission and positional applications.

Dimensional Drawing and Technical Diagrams

1734_egJBOq_bs-4235-2.jpg

Key Dimensions and Technical Parameters

Dimensions in mm - source BS 4235-2

Publication date: 10/1977
b nom max 1 1.5 2 2 2.5 3 3 4 4

b min

 0.975 1.475 1.975 1.975 2.475 2.975 2.975 3.97 3.97
d2 min 3.88 6.85 6.85 9.85 9.85 12.82 15.82 15.82 18.79
d 2 max 4 7 7 10 10 13 16 16 19
h min 1.34 2.54 2.54 3.625 3.625 4.925 6.41 6.41 7.41
h max) 1.4 2.6 2.6 3.7 3.7 5 6.5 6.5 7.5

Dimensions in mm - source BS 4235-2

Publication date: 10/1977
b nom max 5 5 5 6 6 8 10

b min

 4.97 4.97 4.97 5.97 5.97 7.964 9.964
d2 min 15.82 18.79 21.79 21.79 24.79 27.79 31.75
d2 max 16 19 22 22 25 28 32
h min 6.41 7.41 8.91 8.91 9.91 10.89 12.89
h max 6.5 7.5 9 9 10 11 13

Reproduced by permission of DIN Deutsches Institut für Normung e. V. The definitive version for the implementation of this standard is the edition bearing the most recent date of issue, obtainable from Beuth Verlag GmbH, Burggrafenstraße 6, 10787 Berlin, Germany.
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