Most modern Audi lug bolts are M14x1.5 with a 60-degree conical seat; some smaller or older models use M12x1.5. The exact size depends on model, year, and wheel specification, so verify for your vehicle before purchasing replacements.
This article explains the typical bolt sizes you may encounter, how to determine the exact size for your car, and where to find authoritative specifications.
Common lug bolt sizes used by Audi
Here are the sizes you’re most likely to encounter on Audi models. The critical details are the thread diameter (M), the thread pitch (x1.5 is common), and the seat type (usually 60-degree conical).
- M14x1.5 with a 60-degree conical seat — the most common size on modern Audis.
- M12x1.5 with a 60-degree conical seat — used on some smaller models or certain configurations; verify for your car.
Notes: The bolt length and the seat type can vary; some wheels require longer bolts for thick spacers or aftermarket wheels. Always ensure the bolt length is appropriate for your wheel assembly.
How to determine your exact lug bolt size
To avoid incorrect replacements, identify the precise lug bolt specification for your Audi using one or more of these methods:
- Check the owner's manual or the official Audi parts catalog for your VIN. The catalog lists the exact bolt size, seat, and length for each wheel position.
- Inspect a bolt from your vehicle. Measure the major diameter of the threaded portion and count the threads over a known length; a thread gauge can help confirm the pitch (e.g., 1.5 mm).
- Identify the seat type by examining the bolt seat that fits into the wheel through the hole: 60-degree conical is common on Audi, but some wheels use a different profile; mismatched seat will cause poor seating.
- Check the wheel or hub compatibility. If you have aftermarket wheels, confirm they are designed for the same bolt pattern and thread size, and note any spacer usage that could require longer bolts.
- When in doubt, contact an Audi dealer or a qualified mechanic with your VIN, wheel size, and model to confirm the exact lug bolt specification before purchasing replacements.
Having the exact bolt size is essential for safe wheel installation; using the wrong size can damage the wheel bolts, hub, or wheel stud.
Additional considerations
Beyond thread size, take into account bolt length, seat type, and the possibility of aftermarket wheels. Some Audi models with thicker aftermarket spacers may require longer bolts, while wheels with different hub tolerances can alter the needed bolt length.
Summary
In short, Audi lug bolts are typically M14x1.5 with a 60-degree conical seat on most modern cars, with M12x1.5 appearing on some smaller or older configurations. Always verify using the VIN, owner's manual, or a dealership to ensure you get the correct size, length, and seat type for your wheels. Correct sizing is crucial for safe driving and proper wheel seating.