Support rollers without flange rings
SKF support rollers without flange rings (fig. 1) are designed for applications where associated components limit axial movement of the outer ring. Based on needle roller bearings, these support rollers are available with or without an inner ring. Support rollers with an inner ring have an inner ring that is slightly wider than the outer ring to avoid axial clamping of the outer ring. Support rollers without an inner ring are intended for arrangements where the pin or shaft is hardened and ground.
STO and RSTO design support rollers
STO design support rollers (fig. 2) have an inner ring, while RSTO design support rollers (fig. 3) do not have an inner ring. Both designs are only available open (without seals). The components can be mounted separately, but the outer ring and the needle roller and cage assembly must always be kept together as supplied.
NA 22...2RS and RNA 22...2RS design support rollers
NA 22...2RS design support rollers (fig. 4) have an inner ring, while RNA 22...2RS design support rollers (fig. 5) do not have an inner ring. The needle roller and cage assembly is guided axially between two integral flanges in the outer ring to form a non-separable unit. The inner ring of NA 22…2RS design support rollers can be mounted separately from the outer ring, roller and cage assembly. Both designs are supplied greased and capped with a sheet steel reinforced NBR contact seal on both sides.