Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 133,169 pages of information and 210,845 images on early companies, their products and the people who designed and built them.
of St. John's Works, Bradford
1907 Company founded.
1910 Private company.
1919 March. Advert for Hepworth piston rings as used on the Napier Lion engine in the DH9 biplane.
1937 Manufacturers of pistons, piston rings, gudgeon pins, cylinder liners and valve inserts. "Aero Vacrit" Piston Rings. "Heplex" and "Hepolite" Pistons. "Vacrit" Cylinder Liners.
1939 See Aircraft Industry Suppliers
1949 Advert. Automotive components.
1961 General engineers and manufacturers of pistons, rings, pins, cylinder liners, grey iron castings and gas turbine blades. 5,000 employees.
1963 Motor Show exhibitor. Hepolite pistons.
1965 Factories at Bradford, Saltaire, Leeds, Yeadon and Sunderland. Description of detailed planning of the company's training programme and staff progression for all of its employees.