Cummins 5257057 Piston Pin

The Cummins 5257057 piston pin is manufactured from high-strength alloy steel with a case-hardened surface finish to withstand high combustion loads and shear stresses in diesel applications. It features an outer diameter of 35 mm and a length of 73 mm with a net weight of approximately 1.0 kg. The pin is designed for full-floating piston pin retention using circlips. This component serves as a direct replacement for Cummins ISF2.8 and QSF2.8 engine series, and cross-references to engine models QSB4.5, ISG11, and ISB6.7. Primary vehicle applications include Foton light-duty truck platforms such as the Traveller, Kangrui H3, Aumark, Forland, Rowor, and Tunland. It is also utilized in excavators, generator sets, and marine propulsion units powered by the ISF2.8 platform. The part supersedes or interchanges with Cummins OEM numbers 4944443, 4916767, 3678590, 4910289, and 5477660. Supplied in standard industrial packaging meeting Cummins specifications for aftermarket and genuine service channels.