Original BMW Torx Head Starter Bolt M10x30 for 1, 2, 3, 4, 5, 6, and 7 Series, M, X1, X3, Z4, and Z8 (1999–2016)

Holding the starter motor to the engine is the job of this Genuine BMW M10x30 Torx head bolt, part number 07-12-9-903-798, used on a wide span of BMW 1 Series through 7 Series, M, X1, X3, Z4, and Z8 models from 1999–2016. BMW's own name for it is ASA-Bolt. The M10x30 size means a 10 mm thread diameter and a 30 mm length. Each bolt weighs 23 g (0.81 oz). Starter bolts clamp the starter flange tight against the engine so the drive pinion stays aligned with the flywheel ring gear. This bolt is made in Germany.

Original BMW Parts carry a 24-month parts warranty.

BMW began producing this version in December 2006, replacing the earlier bolt 07-12-9-902-636. BMW marks the two as retrospectively interchangeable, so this bolt also serves cars built before 2006 that left the factory with the older number. That is why one part number covers everything from late-1990s E46 models to the F-series cars of the mid-2010s. BMW's parts data shows it on four-cylinder N20 and N26 engines and on six-cylinder N54 and N55 engines, among others.

Technical Details

• Manufacturer: BMW (Genuine)
• Part number: 07-12-9-903-798
• BMW parts name: ASA-Bolt
• Thread and length: M10x30 with a Torx head
• Weight: 23 g (0.81 oz)
• Production start: December 2006
• Supersedes 07-12-9-902-636, retrospectively interchangeable
• Country of manufacture: Germany
• Warranty: 24-month parts warranty

Common Questions

Is this the same bolt as 07-12-9-902-636?
It is the replacement. BMW superseded that number with this one in December 2006 and rates the newer bolt as retrospectively interchangeable.

What size is it?
It is an M10x30 bolt with a Torx head, weighing 23 g.

Where is it made?
It is a Genuine BMW part made in Germany.

Fitment & Compatibility

Compare your production year and trim against the table below. Send your VIN and PMB Performance will confirm the fit, drawing on more than 20 years in the trade.