What is the term used for the dimension of the extensions of the flat side of a part beyond the radius of the bend?

The correct term for the dimension of the extensions of the flat side of a part beyond the radius of the bend is "Mold line dimensions" (MLD). Mold line dimensions refer specifically to the points where the flat sections of a part extend before and after the bend occurs, providing critical information for the manufacturing and design of sheet metal components.

Understanding mold line dimensions is essential in the fabrication of parts, as they help determine how much material is required and ensure that the bends will not interfere with other parts or assemblies. This term is particularly relevant in industries where precision bending and shaping are necessary for the structural integrity and fit of aircraft components.

The other terms listed, such as bend allowances, extension lengths, and flat width dimensions, have different meanings and applications. Bend allowances refer to the extra material required for the bend to account for the material thickness and bend radius, while extension lengths denote the distance that a part extends from a certain point, often in relation to features other than bends. Flat width dimensions refer to the overall width of a flat piece before any bending occurs. Each of these terms plays its own role in metalworking but does not specifically pertain to the dimension of extensions beyond the radius of a bend like mold line dimensions do.