Machine Design
A woodruff key is

Fitted in pairs at right angles
A tapered key with head at one end
All of these
Capable of tilting in a recess milled out in the shaft

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Machine Design
Tapered roller bearings can take

Both radial and axial loads and the ratio of these being less than unity
Axial load only
Both radial and axial loads and the ratio of these being greater than unity
Radial load only

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