Original BMW Cylinder Head Screw Plug with Gasket Ring M18x1.5 for BMW 1–8 Series, M Models, X Models, Z4, i3, and i8 (2002–2024)

Threaded into the cylinder head, this Original BMW M18x1.5 screw plug closes the access hole for the timing chain guide bolt on a wide range of BMW gasoline engines from 2002–2024, from the 1 Series through the X7. BMW calls it a screw plug with gasket ring. It comes with its sealing gasket fitted, so the plug and its seal arrive as one part. A plug like this gives a technician access to an internal bolt without opening the engine, then seals the opening against oil. It weighs 22 grams and is made in Italy.

Original BMW Parts carry a 24-month parts warranty.

BMW has produced this plug since April 2001, and the same part serves many engine families. BMW applies it to four-cylinder N20, N26, N43, N45, and N46 engines, six-cylinder N52, N53, N54, and N55 engines, the S55 in the M2 Competition, M3, and M4, and the N63 V8. Because one plug covers so many engines, check the thread size and the gasket ring against the plug you remove. Both should match this M18x1.5 part.

Technical Details

• Manufacturer: BMW
• Part number: 11-31-7-502-048
• BMW part name: screw plug with gasket ring
• Thread: M18 x 1.5
• Includes: sealing gasket ring
• Weight: 22 g (0.78 oz)
• Production start: April 2001
• Made in Italy
• Sold individually
• Warranty: 24 months

Common Questions

Is the sealing gasket included?
Yes. BMW supplies this plug with its gasket ring as one part.

What does this plug cover?
It closes the access hole in the cylinder head for the timing guide bolt.

What thread does it use?
The plug has an M18 x 1.5 thread.

Fitment & Compatibility

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