Original BMW Crankshaft Pulley Hub Bolt M18x1.5x108 for BMW 2, 3, 4, 5 Series, M2, M3, M4, X1, X3, X4, X5, X6, and Z4 (2012–2021)

Original BMW crankshaft pulley bolt 11-21-7-614-270 is the M18 collar screw that clamps the crankshaft pulley hub to the front of the crankshaft on N20, N26, N55, and S55 engines in models from the 228i through the M4. BMW calls this part a collar screw and specifies an M18x1.5 thread with a 108 mm length. At 267 g, it is a heavy fastener for its job. BMW production of this number began in March 2011. The bolt is one-time use only, so a new one goes in whenever the hub comes off the crank snout.

Original BMW Parts carry a 24-month parts warranty.

The pulley bolt supplies the clamping load that holds the hub, and the belt pulley mounted to it, tight against the crankshaft nose. This number superseded the earlier 11-21-7-573-672, and BMW marks that change as non-exchangeable retrospectively, meaning the newer bolt is not approved to go back onto engines that used the older number. BMW's parts data assigns the same bolt to the four-cylinder N20 and N26, the six-cylinder N55, and the S55 used in the M2 Competition, M3, and M4.

Technical Details

• Manufacturer: BMW
• Part number: 11-21-7-614-270
• BMW name: collar screw
• Thread and length: M18x1.5 x 108 mm
• Weight: 267 g (0.6 lb)
• Production start: March 2011
• Supersedes 11-21-7-573-672, not interchangeable retrospectively
• One-time use fastener, sold individually
• Made in Germany
• Warranty: 24-month parts warranty

Installation & Tuning Notes

Lightly oil the threads before installation. Torque the bolt to 100 Nm, then turn it a further 270 degrees.

Common Questions

Can I reuse my old crank pulley bolt?
No. This bolt is one-time use only, so fit a new one each time the hub is removed.

Will this replace part number 11-21-7-573-672?
BMW superseded that number with this one but marks the change as non-exchangeable retrospectively. Contact PMB before fitting it to an engine that called for the older bolt.

Fitment & Compatibility

Use the fitment table below to confirm year, model, submodel, and application notes before ordering. PMB Performance can confirm this against your VIN, backed by more than 20 years of parts and fitment work.