The two forms of NILOS-Ring, the AV and the JV, are produced for the bearing sides shown in the illustration. The dimensions of the sealing edge are significantly different from those for other forms due to the difference in width between the inner and outer bearing rings. They are dimensioned to guarantee to be always  in place on the roller bearing ring and thus ensure that proper sealing is achieved in all cases.

AV	JV	AK
A NILOS-Ring that seals the outer roller bearing ring is described a  type “AV”. Description: An “externally-sealing” NILOS-Ring for a single-row 302 07 taper roller bearing is described as a type “302 07 AV”.	A NILOS-Ring that seals the inner roller bearing ring is described as a  type “JV”. Description: An “internally-sealing “ NILOS-Ring for a single-row 302 07 taper roller bearing is described as a type “302 07 JV”.	A second type of external seal for taper roller bearings is the NILOS-Double-Ring, here described as a  type “AK” . Description: A “double externally-sealing” NILOS-Ring for a single-row 313 11 taper roller bearing is described as a type “313 11 AK”.