crankpin
nounEtymology From crank + pin.
1
The pin that attaches a connecting rod to a crank.
- Three independent sets of Walschaerts valve gear are provided, those for the outside cylinders being driven by return cranks placed on the driving crankpins, and by crosshead arms attached to the crossheads.1956 April, “"Merchant Navy" Class Pacific Modified”, in Railway Magazine, page 209: