Mechanical fitters assemble, align, install, and maintain industrial mechanical systems used in manufacturing, mining, energy production, and large-scale infrastructure. Their work requires precise interpretation of engineering drawings, understanding of mechanical tolerances, and competency in tools, fasteners, and alignment methods. Globally, they support preventive maintenance, system overhauls, reliability improvements, and equipment commissioning. Increasing automation has shifted the role toward diagnostics, precision measurement, and integration with electromechanical systems. Safety compliance, teamwork, and cross-functional communication remain essential due to hazardous environments and multi-skilled industrial teams.