noun Machinery.
a short cylindrical pin at the outer end of a crank, held by and moving with a connecting rod or link.
Also, crank pin.
Compare web ( def 11 ).

1830–40; crank1 + pin Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
crankpin (ˈkræŋkˌpɪn)
a short cylindrical bearing surface fitted between two arms of a crank and set parallel to the main shaft of the crankshaft

Collins English Dictionary - Complete & Unabridged 10th Edition
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