Original BMW Starter Motor Mounting Bolt M10 x 85 for BMW 1–7 Series, M3, X1, X3, Z4, and Z8 (1999–2017)

On a wide range of BMW 1 Series, 3 Series, 4 Series, 5 Series, 6 Series, 7 Series, M3, M5, M6, X1, X3, Z4, and Z8 models from 1999 to 2017, this Original BMW M10 x 85 bolt holds the starter motor to the engine. BMW calls it an ASA-bolt and designates it M10X85-8.8-ZNS3, which is a 10 mm thread, 85 mm long, property class 8.8, with a ZNS3 chrome-free Cr(VI) finish. Each bolt weighs 56 grams. This genuine BMW bolt is made in Taiwan and sold individually.

Original BMW Parts carry a 24-month parts warranty.

BMW treats this one as a one-time-use bolt and requires a new one whenever the starter is serviced or replaced, so the starter stays tight and cannot shift. Production of the current number began in June 2006, and BMW marks it as interchangeable with the earlier 07-12-9-902-652. Chassis in BMW's application data include the E46, E90, E92, F30, F32, F10, F01, E84, F25, E85, and E89, with N20, N52N, N54, N55, and S55 engines among them.

Technical Details

• Manufacturer: BMW, genuine part
• Part number: 07-12-9-903-800
• BMW part name: ASA-bolt
• Size: M10 x 85, property class 8.8
• Finish: ZNS3, chrome-free Cr(VI)
• Weight: 56 g (0.1 lb)
• Production start: June 2006
• Replaces: 07-12-9-902-652
• Country of manufacture: Taiwan
• Sold individually, priced each
• Warranty: 24 months

Common Questions

Can I reuse my old starter bolts?
No, BMW classes this bolt as one-time use and requires new ones whenever the starter is serviced.

Does this replace 07-12-9-902-652?
Yes, BMW rates it as interchangeable with that earlier number.

Fitment & Compatibility

Use the fitment table below to confirm year, make, model, submodel, and any notes tied to your exact vehicle. Pay close attention to engine, chassis, position, and option-specific details before ordering. PMB Performance can confirm this against your VIN, backed by more than 20 years of parts and fitment work.