Original BMW ASA Bolt M6x38, Valve Cover, for 1 Series M, 135i, 335i, 335is, 535i, 740i, 740Li, X6 xDrive35i, and Z4 sDrive35i (2007–2016)

Each Original BMW valve cover bolt is an M6x38 fastener that holds the cylinder head cover on the N54 engine in the 135i, 335i, 535i, 740i, X6, Z4, and 1 Series M from 2007–2016. BMW names it an ASA bolt, part number 11-12-7-556-977. Each bolt weighs 25 g (0.88 oz), and BMW sells them individually. Production of this number began in June 2006. Valve cover bolts clamp the cover evenly against its gasket so the joint with the cylinder head stays sealed.

Original BMW Parts carry a 24-month parts warranty.

BMW uses this one bolt across the N54 cars in the fitment, from the E82 and E88 1 Series and the E90, E91, E92, and E93 3 Series to the E60 and E61 facelift 5 Series, the F01 and F02 7 Series, the E71 X6, and the E89 Z4.

Technical Details

• Manufacturer: BMW (Original BMW Parts)
• Part number: 11-12-7-556-977
• BMW part name: ASA bolt
• Size: M6x38
• Weight: 25 g (0.88 oz)
• Production start: June 2006
• Sold individually
• Warranty: 24 months

Common Questions

Is this the same bolt on the 335is and Z4 sDrive35is?
Yes. BMW applies this number to the N54T engine in the 335is, Z4 sDrive35is, and 1 Series M as well as to the standard N54.

Where is this bolt made?
This Original BMW valve cover bolt is made in Germany.

PMB Performance supplies Original BMW engine fasteners for N54 owners and shops.

Fitment & Compatibility

Confirm your model year and submodel against the table below before ordering. PMB Performance can confirm this against your VIN, backed by more than 20 years of parts and fitment work.