Harmonic Balancer Pulley Torx Bolt, M8x20 - F8X M2/M3/M4, S55

This part is listed by BMW as BMW part number 11237575488 (11 23 7 575 488) and is described as the mounting bolt for the front harmonic balancer/crankshaft pulley on S55 engines in F87 M2 Competition, F80 M3, and F82/F83 M4. The original torque procedure is to tighten to a specific value and then make an additional turn to stretch the bolt. This makes the bolts 1-time use only. It's a M8x20mm Torx screw. Sold per bolt.

This is a Genuine BMW S55 harmonic balancer bolt with a two year warranty. Buying a Genuine part will usually be more expensive than an OEM or aftermarket brand but you are assured that it meets BMW's designs for fitment, performance, and longevity. It will also be the very latest design, incorporating any updates or revisions that an aftermarket brand typically will ignore.

For full BMW fitment information or for assistance from one of our BMW experts, we recommend calling us at 877-639-9648.