U Bolts
U bolts are bent bolts with threads at both ends. They can be classified as round, square or semi-round. Round U bolts are actually U-shaped, while square U bolts are shaped like three sides of a rectangle with rounded corners. Semi-round U bolts, in contrast, have a shallower curve than round U bolts.
U bolts are used in situations in which suspended items need to be attached to the surface of components. They are commonly seen in construction and the automotive manufacturing.
U bolts may be made of a number of different materials, but the most common material used tends to be stainless steel. They are also available in a number of different sizes and may be measured with imperial or metric units. Metric U bolts are more common, as both domestic and international auto manufacturers use metric units.