Cummins 205269 Piston Pin Retainer

The Cummins 205269 is a piston pin retainer, also referred to as a circlip or snap ring, designed for the piston and connecting rod assembly. It is manufactured from high-grade spring steel to withstand extreme centrifugal forces and thermal cycling in heavy-duty diesel applications. This component is critical for maintaining piston pin axial position within the piston boss. It serves the Cummins KT and QSK engine platforms, specifically the 19-liter (K19/QSK19), 38-liter (K38/QSK38), and 50-liter (K50/QSK50) displacement families. Common engine configurations include KTA19, KTA38-G series (G1, G2, G4, G5, G9), KTA50, and their QSK high-pressure common rail equivalents used in mining trucks, hydraulic excavators, generator sets, and marine propulsion. The part weighs approximately 0.0106 kg (0.0234 lbs).