Are Subaru bolts metric or standard?
Subaru vehicles use metric fasteners, including bolts, nuts, and screws. This means that Subaru bolts are measured in millimeters rather than the standard inch-based system used in the United States. Understanding the bolt sizes and thread patterns used in Subaru vehicles is important for maintenance and repair work.
Metric Fasteners in Subaru Vehicles
Subaru, like many other Japanese and European automakers, has standardized on the use of metric fasteners throughout their vehicles. This includes all bolts, nuts, and screws used in the engine, suspension, body, and other components. The most common Subaru bolt sizes are M6, M8, M10, and M12, with thread pitches ranging from 1.0 mm to 1.5 mm.
Using the correct metric fasteners is crucial when working on a Subaru, as mixing in standard (inch-based) hardware can lead to improper fit, thread stripping, and other issues. Subaru service manuals will always specify the proper metric sizes and torque values for each fastener.
Why Subaru Uses Metric Fasteners
- Metric fasteners are the global standard, used by the majority of automakers worldwide.
- Metric hardware provides a more precise fit and allows for tighter manufacturing tolerances.
- Metric bolts and nuts are generally stronger and more durable than standard inch-based fasteners.
- Using a single fastener system simplifies parts inventory and reduces the risk of mixing incompatible hardware.
While the use of metric fasteners may be unfamiliar to some DIY mechanics in North America, it is a common practice that helps ensure the reliability and performance of Subaru vehicles. Becoming familiar with metric bolt sizes and using the proper tools is an important part of working on these cars.
