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Wes[_2_]

wrote:

A woodruff key is used where the loss of the key through lateral
movement is to be avoided. It is also used where a controlled torque
shear is required. They fail very predictably under high impact shear
loads, providing a certain level of mechanical protection to
drivelines.

Lawn mower flywheels typically have an aluminum woodruff key so whey you hit that rock or
whatever, the flywheel can slip instead of damaging the crank.

Wes