The piston pin is made of low-carbon alloy steel (chromium steel). The inner and outer surfaces and both ends are all carburized and quenched, the quenching depth is 0.5 + 0mm, and the piston pin has a hollow cylindrical shape. The outer diameter of the piston pin of the non-supercharged FL912 / 913 diesel engine is Φ35, and the outer diameter of the piston pin of the supercharged BFL913 / BFL913C diesel engine is 40.
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