31-5060 Bolt
WARNING: This page is about a different car, the 2011 BMW X6 and 2010 BMW X6. However, it is still accessible from the selected car via links, so may be relevant.
0491977 315060 Bolt MW
NOTE:
(Drive pin) For radial gears in the front axle differential for checking the coefficient of friction [Discontinued]
Courtesy of BMW OF NORTH AMERICA, INC.