the helical ridge on a screw formed by a die or lathe tool
screw thread in American English
the helical ridge of or for a screw
screw thread in American English
noun
1. Also called: worm
the helical ridge of a screw
2.
a full turn of the helical ridge of a screw
Word origin
[1805–15]This word is first recorded in the period 1805–15. Other words that entered Englishat around the same time include: alpaca, diminishing returns, makeup, napoleon, polarization
All related terms of 'screw thread'
acme screw thread
a type of screw thread having inclined flat flanks and a flat top and bottom : used in machine tools
Sellers screw thread
a thread form in a system of standard sizes proposed by Sellers in 1884 and later accepted as standard in the USA, having a 60° flank angle with a flat top and foot
unified screw thread
a screw thread system introduced for defence equipment (1939–44), in which the thread form and pitch were a compromise between British Standard Whitworth and American Standard Sellers : adopted by the International Standards Organization
Whitworth screw thread
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
international screw thread
a metric system for screw threads relating the pitch to the diameter
British Association screw thread
a system of screw sizes designated from 0 to 25. Now superseded by standard metric sizes