This category contains site of job shops and manufacturers that specialize in fabricating metal parts either in a more sophisticated way than by general machining or in a less than usual -- and more than likely advanced and complex -- form. It also includes site of companies that offer a diversified range of capabilities and are difficult to classify under an otherwise narrow heading (e.g. spinning, stamping, etc.).
Note: There is a subtle but important difference between sites in this category and those indexed in the Sheetmetal one. There, the essential emphasis is on working with sheet material that is cut, pressed, bent, and, often enough, also stamped into a required shape. Or, to put it another way, sheetmetal products could be hammered flat, whereas fabricated metal components could never be returned to their original shape.