High Quality Content by WIKIPEDIA articles! High Quality Content by WIKIPEDIA articles! A frame is the main structure of an automobile chassis. All other components fasten to it. There are three main designs for frame rails. Their cross- sections include: 1. C-shaped, 2. Boxed, 3. Hat, C- shape, By far the most common, the C-rail has been used on nearly every type of vehicle at one time or another. It's made by taking a flat piece of steel (usually ranging in thickness from 1/8" to 3/16") and rolling both sides over to form a c-shaped beam running the length of the vehicle.

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