After the American Civil War, Disston returned to work in his father's factory as an executive. In 1878, following the death of Henry Disston, Hamilton and his brothers Horace, William, and Jacob inherited the company which had been renamed to Henry Disston & Sons. Hamilton became the controlling member of the 2,000-employee company and expanded production to 1.4 million hacksaws and three million files per year. Only a month after Henry's death, Hamilton gave President Rutherford B. Hayes a tour of the factory where an unshaped piece of steel was manufactured into a hand saw in only 42 minutes, and was presented to the president at the end of the tour—etched with his name.