center pin

noun Railroads.
a cylindrical device passing through the center plates of both the body bolster and the truck bolster, permitting the truck to swivel beneath the car body while the stress is taken by the center plate.

1795–1805 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
The center pin reel is the basis behind this technique.
The racks are secured in place by a threaded center pin and protective cover, as shown in the picture.
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