There are a few different types of bolts that are used on Toyota Corollas, depending on the model and year. The most common type is the hexagon head bolt, which is typically used for engine and suspension components. These bolts come in a variety of sizes, ranging from M8 to M12. The size of the bolt will be stamped on the head, usually followed by a letter that indicates the width of the thread (e.g., M8 x 1.25).
Another type of bolt that is sometimes used on Toyota Corollas is the torx head bolt. These bolts have a star-shaped head that is designed to provide more resistance to tampering and looseness. Torx head bolts are typically used for attaching body panels and other exterior parts. The size of these bolts ranges from T30 to T50, with the larger sizes being used for stronger applications.
Finally, there are also flange bolts that are occasionally used on Toyota Corollas. These bolts have a flat base with a raised collar around the edge, which helps to distribute load evenly and prevents loosening over time. Flange bolts are typically used for attaching exhaust system components and other heavy duty parts. The size of these bolts ranges from 10mm to 14mm.