a long, narrow, multiple spring composed of several layers of spring metal bracketed together: used in some suspension systems of carriages and automobiles.
one of a number of metal strips bracketed together in length to form a compound spring
the compound spring so formed
Collins English Dictionary - Complete & Unabridged 10th Edition
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They finished installing the third member gearbox and noticed the rear right leaf spring was loose.
Leaf spring hangers are made of either formed high strength steel or cast steel.