There are no hard and fast rules governing maximum and minimum limits for wall thicknesses.
They should be as consistent as possible throughout the component and, where variations are required, transitions should be provided to avoid abrupt changes. Die casters who use high-technology equipment and techniques routinely produce castings with maximum and minimum wall thicknesses and with variations that were impossible a few years ago. This capability should be utilized only as necessary to achieve performance or economic advantages. Uniform wall thicknesses are otherwise preferred.