The Komatsu 7075111630 is an authentic OEM back-up ring designed for hydraulic cylinder applications in a wide range of Komatsu heavy machinery. This crucial component helps prevent extrusion of the primary seal under high pressure, ensuring optimal hydraulic system performance and longevity. With an inner diameter of 125 mm, an outer diameter of 135 mm, and a thickness of 2.5 mm, this back-up ring is engineered to precise Komatsu specifications. It is compatible with numerous Komatsu excavator (PC series), wheel loader (WA series), dozer (D series), motor grader (GD series), articulated dump truck (HM series), and rigid dump truck (HD series) models.