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From: ------
From: ------
The best way to answer your question is to give a design use and a physical description. Ok, here it goes . A woodruff key is rectangular in shape. A Saddle Key has three sides that are square to each other and the last surface has a curvature or radius. The woodruff key when used to lock a pulley on a shaft normally fits into machined slots in both the pulley and the shaft. This locks the pulley to the shaft and in used in high load applications. The saddle key, which is normally tapered depends entirely on friction between the shaft and the pulley to lockout movement bewteen the two. The pulley would have a rectangular slot for the saddle pin and the saddle key radius would rest against the shaft. Now normally the the face of the key resting against the shaft would have a radius some-what smaller than the radius of the shaft. The taper and the radius would provide the friction neccesary to keep the pulley from rotating relative to the shaft. A saddle key is used in low-load requirements.
Hope this helps!