crankpin
/ˈkræŋkˌpɪn/
noun
- A pin or bolt that connects a connecting rod to a crank, allowing the rod to pivot as the crank rotates.
- The mechanic replaced the worn crankpin to fix the engine's knocking sound.
- The engineer inspected the crankpin for cracks before reassembling the motor.
- In a steam locomotive, the crankpin transfers force from the piston to the driving wheels.