Definition of screw shackle in English:

screw shackle

noun

  • 1(More fully "screw shackle joint") a coupling consisting of a collar or sleeve into which the threaded ends of two rods are screwed; a screw coupling (now rare).

  • 2A shackle in which the end of the bar is threaded so that it may be securely held in place by a nut or threaded socket.

Origin

Mid 19th century.