a metal sleeve with opposite internal threads at each end for the threaded ends of two rods or for ringbolts, forming a coupling that can be turned to tighten or loosen the rods or wires attached to the ringbolts
A metal coupling device consisting of an oblong piece internally threaded at both ends into which the corresponding sections of two threaded rods are screwed in order to form a unit that can be adjusted for tension or length.
- A coupling device consisting of two eyelets or other connection points connected in screw threads. The joint in between can be turned to shorten or lengthen the device with mechanical advantage provided by the screw threads.
- (nautical) A link threaded on both ends of a short bar which is used to pull objects together. (FM 55-501)