Crescent key (feather key) -KINGWELLE 4x4x18mm- used for crankshaft/clutch Kingshaft for Vespa Largeframe PX

Half-moon wedge 4x4x18 mm for king shaft clutch on Vespa PX

The original Piaggio disc springs (half-moon wedges) are characterized by a production process that deviates from the DIN standard. The woodruff keys have significantly larger radii and therefore make installation considerably easier.

Please note: A Woodruff key is not designed to transmit drive forces. It is only there to position the components in relation to each other. The frictional connection between the two components is established via the tightening torque and, if present, via a cone.