RSTO50 bearing: complete specifications & equivalents

Specification table

Source: catalog reference (HR1 2026-09-25) · extracted 2026-09-30

Parameters extracted from the official FAG Rolling Bearings catalogue (HR1 2026-09-25); FAG® is a trademark of Schaeffler Technologies AG & Co. KG, used here for identification only — mpnbase is not an authorized FAG/Schaeffler distributor. Boundary dimensions are ISO 15 interchangeable; current production values may differ, verify at schaeffler.com.

Cross references & equivalents

Interchange levels: full standard interchange · partial verify parameters · verify manual confirmation required. Links resolve to the equivalent model's specification page where available.

How the RSTO50 model number is decoded

envelope 60×90×19.8 mm: the 90 mm outside diameter is the track-running surface — a thick-walled outer ring over a 60 mm bore — and the 19.8 mm width sets the contact width on the mating track the catalogue lists C 25.5 kN and C0 47 kN for the RSTO yoke-type track roller without inner ring, without axial guidance; the C/C0 ratio of 0.54 reflects a rolling-element pack sized for heavy static track loading, and the 15.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 6.4 kN at 60 mm bore, equivalent to 0.42 kN of dynamic rating per millimetre — the limiting speed is 650 r/min and, as for HR1 track rollers, no thermal reference speed is published the 60 mm bore takes the mounting pin or shaft; across the 19.8 mm contact width the dynamic rating works out to 1.29 kN per millimetre of rolling-element complement mass is 481 g, or 0.27 g per mm² of the 90×19.8 mm track envelope — inertia that the drive must accelerate on every index of the cam 60 mm pin bore marks the medium range: mounting forces and fits become critical, and the 481 g mass calls for proper induction or press tooling rather than hand fitting Reading RSTO: yoke roller, no inner ring, no flanges; lateral guidance and contamination protection must come from the machine structure around the 19.8 mm-wide roller At 481 g the roller adds little inertia to follower linkages, but the unflanged design walks off a skewed track — track parallelism substitutes for the missing guidance Typical applications include woodworking machine feed tracks, cam drives and indexing tables and packaging machine timing mechanisms, where the 90 mm track diameter and 25.5 kN dynamic rating match the duty. In woodworking machine feed tracks the unit fits a compact 60 mm seat, and in cam drives and indexing tables the 481 g mass keeps follower kinetics light. Designers also specify it for packaging machine timing mechanisms, relying on the 19.8 mm width and the published 47 kN static rating. Check the mating track hardness and flatness — a soft or scalloped rail fails before the 90 mm outer ring does. Flangeless STO/RSTO/RNA22/NA22 rollers need external axial location; circlips or shoulders must control end float or the roller walks off the track.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• Check the mating track hardness and flatness — a soft or scalloped rail fails before the 90 mm outer ring does.
• Flangeless STO/RSTO/RNA22/NA22 rollers need external axial location; circlips or shoulders must control end float or the roller walks off the track.
• Yoke lugs must support the pin on both sides over its full length — single-sided support turns the pin into a cantilever beam.