Woodruff Key 5/16 x 1 in Key Size Steel. Woodruff Keys are semi-circular keys that are commonly used for mechanical applications. It fits in a half-moon slot in a shaft, exposing the flat side of the tab. They are designed not to function when excessive force is placed on the shaft.
Replaces: 500007-29, 50000729, HM500007-29, S-E968, WA500007-29