SKF spacing washers
ZW spacing washers (fig 1) are required when an open bearing with Z sealing washers at both sides is to be relubricated (fig 2 and fig 3). They should be mounted at one side of the bearing adjacent to the inner as well as the outer ring.
The ZW spacing washers are made of phosphated sheet steel and are coated with a preservative. The thickness of the sheet steel is 0,6 mm for washers up to and including ZW 35 × 42 and 0,8 mm for the larger sizes.