*** Currently NLA from BMW ***
The Crankshaft Pulley Bolt secures the crankshaft pulley to the crankshaft. One bolt is required per engine, and they are a one time use bolt. They must be replaced after removal, per BMW TIS reccomendations.
Note: This bolt is torqued to 410Nm. To torque this fastener properly, use a special counter hold tool to keep the crank from moving.