DIN 471 retaining rings for shafts, 20 mm, Article number 471020GEO. Property class / material: spring steel, surface finish zinc flake, silver. Retaining Rings for Shafts manufactured to DIN 471. Standard parts to the same standard, property class, dimensions and surface finish are interchangeable between manufacturers; confirm the controlling standard revision, any class-society or application approval, and the mating thread before substitution. Applications: axial location of bearings, gears and shafts in machine building, plant maintenance and marine equipment.