Hillman 883870 Woodruff Key, 4 mm W, 12.65 mm L, Steel, Plain

Woodruff keys are semi-circular keys that are commonly used for mechanical applications. It fits in a half-moon shaped slot, in a shaft, leaving the flat side of the tab exposed. They are designed not to function when excessive force is placed on the shaft.

Features:

• Woodruff keys eliminate the need to mill holes near shaft shoulders
• A second bar, that slides over the shaft, has a slot in it to accommodate the key
• Made of high-strength steel with a plain finish
• Metrically sized