Original BMW Crankshaft Main Bearing Cap Bolt for BMW 3 Series, 5 Series, and Z3 (1977–2000)

The main bearing caps on many BMW M10, M20, M21, M40, M42, M43, M44, M50, and M52 engines are held to the block by this Original BMW M10x75 hex bolt, part 11-11-1-735-525, used in BMW 3 Series, 5 Series, and Z3 models from 1977–2000. Those caps hold the crankshaft in place and keep the main bearings aligned while the crank turns under load. Each bolt weighs 54 g, is made in Germany, and is sold individually. BMW production of this number began in July 1990.

Original BMW Parts carry a 24-month parts warranty.

This number replaced the earlier BMW bolt 11-11-9-912-675, and BMW rates it as exchangeable retrospectively, so it is the correct replacement for engines that left the factory with the older number. Its reach is unusually long. BMW's parts data shows it on the E21, E30, and E36 3 Series, the E28 and E34 5 Series, the E39 528i, and the Z3, along with the S52 M engine. Loose or stretched main cap bolts can cause knocking, a loss of oil pressure from bearing misalignment, and severe engine damage if a bolt breaks and lets the crankshaft move.

Technical Details

• Manufacturer: BMW (Original BMW Parts)
• Part number: 11-11-1-735-525
• BMW name: hex bolt, crankshaft main bearing cap
• Size: M10x75
• Weight: 54 g (0.1 lb)
• Production start: July 1990
• Replaces: 11-11-9-912-675
• Made in Germany
• Sold as: single bolt
• Warranty: 24 months

Common Questions

Is this the same as 11-11-9-912-675?
It replaces that number, and BMW rates it as exchangeable retrospectively.

What thread size is it?
M10 with a 75 mm length.

Is it sold as a set?
No. Each order is one bolt.

PMB Performance supplies Original BMW bottom-end hardware for vintage and modern engine builds.

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 has spent over 20 years matching parts to vehicles and can verify this against your VIN.