DIN 471 retaining rings for shafts, 21 x 1.2 mm, Article number 471021. Property class / material: steel, surface finish plain. 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.