The piston pin is a connecting link between the piston and the connecting rod. Because under the impact of high temperature, and poor lubrication conditions, so it is required to have sufficient rigidity, strength, abrasion resistance. to reduce inertia, it is generally made into a hollow cylinder, to reduce its mass.
Piston pins are generally made of mild steel, surface carburizing, honing and polishing, to improve its surface hardness and overall toughness.
The piston pin is floating in the piston pinhole and the connecting rod small head hole, When the engine is running, It can rotate slowly around its main axis in the pin seat hole, For more even wear.
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