Machine Design
In order to withstand resistance to wear, the best profile of gear is

20° full depth involute tooth
20° involute stub tooth
14½° stub tooth
14½° full depth involute tooth

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Machine Design
A hollow saddle key is

A taper key which fits half in the key way of hub and half in the key way of shaft
Provided in pairs at right angles and each key is to withstand torsion in one direction only
A taper key which fits in a key way of the hub and is flat on the shaft
A taper key which fits in a key way of the hub and the bottom of the key is shaped to fit the curved surface of the shaft

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