roller chain

noun
a power chain consisting of parallel pairs of flat links joined by pins covered with rollers, and engaging with the teeth of sprockets.

Origin:
1895–1900

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
roller chain
 
n
engineering a chain for transmitting power in which each link consists of two free-moving rollers held in position by pins connected to sideplates

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
The weight of the gate is balanced by a counterweight suspended from a roller chain attached to each top corner of the gate.
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