shackle

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shackle

a U-shaped bracket, the open end of which is closed by a bolt (shackle pin), used for securing ropes, chains, etc.

shackle

[′shak·əl]
(design engineering)
An open or closed link of various shapes with extended legs; each leg has a transverse hole to accommodate a pin, bolt, or the like, which may or may not be furnished.

clevis

An iron (or a link in a chain) bent into the form of a horseshoe, stirrup, or letter U, with holes in the ends to receive a bolt or pin. (See illustration p. 218.)