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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