Snapper Pin Univeral Joint 3/8 X 1
Chute Crank Pin for U-Joint, Holds yoke and rod assembly to the joint housing.
Note that Murray - Snapper - Simplicity are owned by Briggs and Stratton. Packaging may have Briggs lettering, but this is an OEM part.
See part number 578060MA in the Snapper parts diagram, click here