Pin of the arms of the pull rods releasing the lower hitch MF ORIGINAL URSUS [1661883M1U] In order to improve the mechanical properties, the ORIGINAL URSUS pins have been subjected to the (induction) hardening process. HARDENING guarantees - longer service life - increased resistance to mechanical damage. The pins can be used for all other machines and devices with matching dimensions . URSUS pins guarantee a safe and durable connection.