Vintage Triumphs used Whitworth thread hardware on much of the bike, as do other vintage British cars and motorcycles such as Norton, BSA, Jaguar, MG and others. It can get confusing in 1968 Triumph started using a combination of Whitworth and standard (UNC, UNF) thread hardware on their engines and chassis. In addition to the threads being different, Whitworth bolts also have different size hex heads than standard hardware. Speciality Whitworth Tools, including sockets, wrenches, taps and dies, are available to be able to work properly on vintage British vehicles.