DIN 472 retaining rings for bores, 90 mm, Article number 472090GEO. Property class / material: steel 435-530 hv, surface finish zinc flake, silver. Retaining Rings for Bores manufactured to DIN 472. 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.