Swagelok was founded by Fred Lennon and Cullen Crawford in 1947. The name Swagelok was created by Lennon and Crawford, for Crawford's invention of a leak-tight fitting swage which formed tubing that held the fitting in place. Crawford Fitting Co., manufactured and sold the fittings. In 1948, Lennon bought Crawford's share in the company. In 1955, Cajon Company was created, adding pipe fittings to the product line. Swagelok also began manufacturing in Canada. In 1957, Nuclear Products Company (Nupro Company) was acquired. In 1965, Swagelok moved its headquarters from Cleveland, Ohio to Solon, Ohio. In 1972, the company expanded into Japan. In 1986, Cajon Company (derived from the names of the Lennon children, Cathy and John, Jr), Whitey Company (Fred's nickname), and Sno-Trik Company (reference to the common phrase: "It's no trick), were all unified under the name the Swagelok Companies. Swagelok has more than 3000 employees.