RSTO15 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 RSTO15 model number is decoded

envelope 20×35×11.8 mm: the 35 mm outside diameter is the track-running surface — a thick-walled outer ring over a 20 mm bore — and the 11.8 mm width sets the contact width on the mating track the catalogue lists C 9.1 kN and C0 11.1 kN for the RSTO yoke-type track roller without inner ring, without axial guidance; the C/C0 ratio of 0.82 reflects a rolling-element pack sized for heavy static track loading, and the 7.5 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 1.67 kN at 20 mm bore, equivalent to 0.45 kN of dynamic rating per millimetre — the limiting speed is 3,300 r/min and, as for HR1 track rollers, no thermal reference speed is published the 20 mm bore takes the mounting pin or shaft; across the 11.8 mm contact width the dynamic rating works out to 0.77 kN per millimetre of rolling-element complement mass is 50 g, or 0.12 g per mm² of the 35×11.8 mm track envelope — inertia that the drive must accelerate on every index of the cam the 20 mm pin bore falls in the small band, the workhorse size for gearbox planetary positions, hydraulic pumps and general cam and linkage duty The thick-walled outer ring is the running element — 35 mm outside diameter over a 20 mm pin seat — and is made to roll flat on a mating track rather than inside a housing Reading RSTO: yoke roller, no inner ring, no flanges; lateral guidance and contamination protection must come from the machine structure around the 11.8 mm-wide roller Typical applications include glass and ceramic line conveyors, linear rail and profile track guidance and printing press sheet-transfer grippers, where the 35 mm track diameter and 9.1 kN dynamic rating match the duty. In glass and ceramic line conveyors the unit fits a compact 20 mm seat, and in linear rail and profile track guidance the 50 g mass keeps follower kinetics light. Designers also specify it for printing press sheet-transfer grippers, relying on the 11.8 mm width and the published 11.1 kN static rating. The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading. Check the mating track hardness and flatness — a soft or scalloped rail fails before the 35 mm outer ring does.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading.
• Check the mating track hardness and flatness — a soft or scalloped rail fails before the 35 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.