4mm x 5mm Zinc Plated Steel Woodruff Keys (5 pcs.)

Diameter: 4mm
Length: 5mm
Material: Steel
Finish: Zinc
Shape: Woodruff
Type: Woodruff Key

Box of 5.

A woodruff key or half-moon key, is a semicircular shaped, removable key that fits into a matching keyway cut into a shaft, leaving a protruding tab. The tab mates with a matching slot on a device mounted flush upon the shaft e.g. a pulley, thus preventing the device from freely rotating about the shaft. It is widely used in machine tools and in the automotive industry.