Definition(s)
King-Pin
Vertical pin or shaft that acts as a rotation-centering device and connects the revolving upper-structure and base mounting.
Source: API RP 2D, Operation and Maintenance of Offshore Cranes, Seventh Edition, December 2014. Global Standards
Source: API RP 2D, Operation and Maintenance of Offshore Cranes, Sixth Edition, May 2007. Global Standards