# The usual proportion for the width of key is (where d = Diameter of shaft or diameter of hole in the hub)

A. $$\frac{{\text{d}}}{8}$$

B. $$\frac{{\text{d}}}{6}$$

C. $$\frac{{\text{d}}}{4}$$

D. $$\frac{{\text{d}}}{2}$$

**Answer: Option C **

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