The piston pin, identified by code H 34021, is a core component in the ASL25 engine’s powertrain, responsible for connecting the piston to the connecting rod. Also known as a gudgeon pin, it transfers the force of combustion from the piston to the crankshaft via the connecting rod. Subjected to extreme cyclic loads and high temperatures, the piston pin must be precisely machined and hardened to withstand wear and deformation. Its integrity is vital to maintaining smooth piston movement and ensuring the efficient conversion of combustion energy into mechanical power.