Whitworth screw thread

/ ˈwɪtwəθ /

noun

1. a thread form and system of standard sizes, proposed by Whitworth in 1841 and adopted as standard in the U.K., having a flank angle of 55° and a rounded top and foot

Word History and Origins

Origin of Whitworth screw thread¹

named after Sir Joseph Whitworth (1803–87), English engineer