Original BMW Engine Cover Cap Nut M6 for BMW M3, M5, Z3 M, Z4 M, and Z8 (2000–2008)

This Original BMW M6 cap nut secures the engine cover on top of the M engines in the BMW M3, M5, Z3 M, Z4 M, and Z8. BMW's parts data calls it a cap nut. On the car it threads onto the studs under the cover and holds the cover firmly against the engine, which keeps engine vibration from shaking it loose. A cap nut has a closed, domed end that covers the stud threads, so the bolt-on looks finished and the threads stay protected. These small nuts often go missing when the engine cover comes off for service work, and a cover with missing nuts is not held the way the factory intended. This nut is made in Denmark and is sold individually.

Original BMW Parts carry a 24-month parts warranty.

BMW has produced this part number since August 1992, and it carries across several generations of M cars. The same nut fits the S62 V8 in the E39 M5 and E52 Z8, the S54 inline six in the E46 M3 and the E85 and E86 Z4 M, and both the S50 and S54 versions of the Z3 M. The part number has no supersession, so the nut you receive is the same one BMW installed at the factory. Each nut is sold individually, so order the quantity you need.

Technical Details

• Manufacturer: BMW
• Part number: 11-12-1-401-517
• BMW part name: Cap nut
• Thread size: M6
• Function: secures the engine cover
• Production start: August 1992
• Country of manufacture: Denmark
• Sold individually, priced each
• Warranty: 24-month Original BMW parts warranty

Common Questions

How many nuts does one order include?
Each order is for one nut. Each nut is priced and sold individually.

Is this the same nut BMW used at the factory?
Yes. It is an Original BMW part under the same number BMW has used since 1992, and it has no supersession.

Why replace a single missing cover nut?
The nuts hold the engine cover against the engine. A full set keeps engine vibration from working the cover loose.

Fitment & Compatibility

Check the table below for the exact year, model, submodel, and any listed notes. PMB Performance can confirm this against your VIN, backed by more than 20 years of parts and fitment work.