This industry comprises establishments primarily engaged in operating machine tools, such as lathes (including computer numerically controlled), automatic screw machines, and machines for boring, grinding, milling and otherwise working metal, to produce machine parts and equipment, other than complete machines, for the trade. Machine shops providing custom and repair services are included.

This industry comprises establishments primarily engaged in turning, facing, forming, parting, boring, threading and knurling metal on machine tools or lathes with machine-held cutting tools, to manufacture precision turned products. Establishments primarily engaged in manufacturing metal fasteners, such as nuts, bolts, rivets and washers, are included.