Original BMW Oil Pump Sprocket Nut, M10x1 Left-Hand Thread, for 3 and 5 Series, M3, X3, X5, Z3, and Z4 (1991–2008)

On BMW six-cylinder engines from the M50 through the M54 and S54, Genuine BMW hex nut 07-11-9-905-857 secures the oil pump drive sprocket to the oil pump shaft on 1991–2008 3 and 5 Series, M3, X3, X5, Z3, and Z4 models. The nut has an M10x1 left-hand thread and a chrome-free finish made without hexavalent chromium. It weighs 7 g (0.25 oz) and is made in Germany. If the nut holding the sprocket lets go, the pump stops turning. If the nut holding it lets go, the pump stops turning.

Original BMW Parts carry a 24-month parts warranty.

BMW put this version into production in April 2006 as the replacement for 07-11-1-735-137 and rates it as retrospectively interchangeable, so it serves earlier engines as well. Other numbers seen against this nut include 07-11-9-921-103. Because the thread is left-handed, it tightens counterclockwise and loosens clockwise, the opposite of a standard nut. Keep that in mind before putting a wrench on it.

Technical Details

• Manufacturer: BMW (Genuine)
• Part number: 07-11-9-905-857
• BMW parts name: Hex nut
• Thread: M10x1, left-hand
• Finish: chrome-free, without hexavalent chromium
• Weight: 7 g (0.25 oz)
• Production start: April 2006
• Supersedes 07-11-1-735-137, retrospectively interchangeable
• Country of manufacture: Germany
• Warranty: 24-month parts warranty

Common Questions

Which way does this nut thread on?
It is an M10x1 left-hand thread, so it tightens counterclockwise.

Is it a concern on a track car?
Yes. The nut can loosen under track use, and safety wiring or tack welding it is recommended for performance applications.

Does it replace 07-11-1-735-137?
Yes. BMW superseded that number with this nut and rates it as retrospectively interchangeable.

Fitment & Compatibility

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