sand core

A sand core is a specially shaped piece of sand packed into a mold used in metal casting. Its purpose is to create hollow or complex internal features within the final metal part that can't be formed with the outer mold alone. Once the mold is filled with molten metal, the sand core is removed, leaving behind the precise internal passages or cavities. This process allows manufacturers to produce intricate and durable metal components used in engines, machinery, and tools efficiently and accurately.