Jack chain

{{Short description|Type of chain}}

{{for|the 15th century armour|Gambeson}}

Image:Jack chain.JPG

File:Double jack chain.jpgA jack chain is a type of chain made of thin wire, with figure-eight-shaped links and loops at right angles to each other. Jack chains are often used to suspend fixtures such as lights or signs, for decorative purposes, or as part of a cable lock.{{cite web|url=http://www.halebros.com/chains/jack_chains.html |title=Jack Chains |publisher=Halebros.com |date= |accessdate=2013-11-02}}

Jack chain may be manufactured as either single-jack chain or as double-jack chain. If double-jack, the lower loop is formed of two strands of wire rather than just one as in a single-jack.

Before the days of lavatory cisterns being close to the pan, jack chains were often used to release the cistern plug.