plural of bolt-rope

(engineering) A theoretical circle passing through the center points of bolt holes positioned with equal spacing.

A fastening device consisting of a bolt and a pair of hinged, usually sprung, wings threaded at the hinge to receive the bolt, used by inserting the bolt with wings folded into a small hole in a sheet material to the point where the wings unfold and the bolt can be tightened.

Fine meshed cloth used to line sieves for grading flour or meal.

A belemnite.

(nautical) An eyebolt to which to hook the throat halyards.

A bolt with a thread on each end, screwed into a fixed part at one end, receiving a nut upon the other.

A bolt having a shackle on the end. / (heraldry) A bearing representing a fetlock for hobbling a horse.

(railways) A strong bolt passing through the drawbar of railway carriages, and serving to fasten the coupling.

A machine screw with a cylindrical unthreaded shoulder to allow for parts to rotate freely on the screw.