In a reciprocating engine, the crankpins, also known as crank journals are the journals of the big end bearings, at the ends of the connecting rods opposite to the pistons. If the engine has a crankshaft, then the crank pins are the journals of the off-centre bearings of the crankshaft. In a beam engine the single crank pin is mounted on the flywh...
pin or journal on which big-end of connecting rod rides.
a short cylindrical pin at the outer end of a crank, held by and moving with a connecting rod or link.