whitworth screw thread

World English Dictionary
Whitworth screw thread (ˈwɪtwəθ)
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
[named after Sir Joseph Whitworth (1803--87), English engineer]

Collins English Dictionary - Complete & Unabridged 10th Edition
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