Original BMW M6 Valve Cover Cap Nut for BMW 3 Series, 5 Series, M3, X3, X5, Z3, and Z4 (1991–2006)

BMW's M6 cap nut 11-12-1-738-608 holds the valve cover to the cylinder head on the six-cylinder M50, M52, M54, and M56 engines, and the S50 and S52 in the M3, across the 3 Series, 5 Series, X3, X5, Z3, and Z4 from 1991 to 2006. A cap nut is closed on top, so it threads onto the valve cover stud and covers the stud end in one piece. BMW names it simply cap nut, and its 18 gram weight reflects a small, simple fastener that still gets heat cycled with every drive. Production of this number started in September 1991.

Original BMW Parts carry a 24-month parts warranty.

This number supersedes 11 12 1 722 984, and BMW marks the change as exchangeable retrospectively, so it fits engines that left the factory with the older nut. The thread is M6 x 1.0. On the 1993 525i, the count changed mid-year: cars built through April 1993 use three of these nuts, and cars from May 1993 use four. It is sold by the piece, so order the count your engine needs.

Technical Details

• Manufacturer: BMW, Original BMW Part
• Part number: 11-12-1-738-608
• BMW name: cap nut
• Thread: M6 x 1.0
• Weight: 18 g (0.63 oz)
• Production start: September 1991
• Replaces 11 12 1 722 984, exchangeable retrospectively
• Sold individually
• Warranty: 24 months

Common Questions

Can I use it on an engine that came with 11 12 1 722 984?
Yes. BMW approves this nut as a retrospective replacement for that earlier number.

What thread does it use?
An M6 x 1.0 thread.

Fitment & Compatibility

Check the table below for the exact year, model, submodel, and any listed notes. PMB Performance has spent over 20 years matching parts to vehicles and can verify this against your VIN.