BMW part number 33321093661 is a rear wheel bearing / hub mounting collar bolt (M10 x 1.0 x 31 mm, Grade 10.9 with an External Torx head). It fits US-market 5 Series (E39 and E60/E61) and 6 Series (E63/E64) vehicles across model years 1997–2010. Secures the rear wheel bearing and hub assembly to the rear wheel carrier (knuckle). Rather than pressing a loose bearing into the knuckle, these BMW models use a bolt-on sealed hub unit. Four of these high-tensile bolts pass from the back side of the rear wheel carrier into the threaded flange of the wheel bearing housing to hold the entire rotating wheel hub onto the rear suspension.
- 5 Series (E39): Fits 1997–2003 sedans and wagons including the 525i (2001–2003), 528i (1997–2000), 530i (2001–2003), 540i (1997–2003), and M5 (2000–2003).
- 5 Series (E60 / E61): Fits 2004–2010 sedans and wagons including the 525i, 525xi, 528i, 528i xDrive, 528xi, 530i, 530xi, 535i, 535i xDrive, 535xi, 545i, and 550i.
- 6 Series (E63 / E64): Fits 2004–2010 coupes and convertibles including the 645Ci and 650i. [1]
- Note on E60 M5 & E63/E64 M6: While standard E60/E61 and E63/E64 models use this M10 bolt, the E60 M5 and E63/E64 M6 use a different (ie, larger M12 bolt).
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