Mortality rates for crane operators were compared to mortality rates among other workers in the steel industry (SIC-3325). The evaluation considered the length and type of exposures, disease specific cause of death, and selected work areas. The study population included 58,828 Pennsylvania steelworkers employed in 1953 and vital status information through 1966. Among crane operators, mortality rates due to cancer of the lungs, bronchus, trachea, and prostate, nonmalignant respiratory diseases, cirrhosis of the liver, accidents, homicides, and suicides were lower than expected. A 4 percent excess mortality rate for cancers of the genitourinary system, and 22 percent excess mortality rate for cardiovascular and renal diseases were found in crane operators. Exposure to particulates created the greatest hazard. Excess mortality in crane operators caused by cardiovascular and renal diseases were found in the coke production, blast furnace, open hearth, foundry, and hot strip rolling work areas. The authors speculate that the constant movement and stress characteristics of crane worker operations may be responsible for excess mortality from cardiovascular and renal diseases.