RSTO45 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 RSTO45 model number is decoded

envelope 55×85×19.8 mm: the 85 mm outside diameter is the track-running surface — a thick-walled outer ring over a 55 mm bore — and the 19.8 mm width sets the contact width on the mating track the catalogue lists C 25 kN and C0 44 kN for the RSTO yoke-type track roller without inner ring, without axial guidance; the C/C0 ratio of 0.57 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 kN at 55 mm bore, equivalent to 0.45 kN of dynamic rating per millimetre — the limiting speed is 750 r/min and, as for HR1 track rollers, no thermal reference speed is published the 55 mm bore takes the mounting pin or shaft; across the 19.8 mm contact width the dynamic rating works out to 1.26 kN per millimetre of rolling-element complement mass is 453 g, or 0.27 g per mm² of the 85×19.8 mm track envelope — inertia that the drive must accelerate on every index of the cam the 55 mm pin bore places this bearing in the medium band, where the 85 mm envelope already carries ratings in the tens of kilonewtons RSTO is the basic yoke-type track roller without inner ring and without axial guidance: the needle rollers run directly on a hardened, ground mounting pin The pin surface at 55 mm must be hardened to 58–64 HRC like a shaft raceway; a soft pin flats quickly under the 44 kN static load Typical applications include packaging machine timing mechanisms, woodworking machine feed tracks and agricultural and textile cam followers, where the 85 mm track diameter and 25 kN dynamic rating match the duty. In packaging machine timing mechanisms the unit fits a compact 55 mm seat, and in woodworking machine feed tracks the 453 g mass keeps follower kinetics light. Designers also specify it for agricultural and textile cam followers, relying on the 19.8 mm width and the published 44 kN static rating. Check the mating track hardness and flatness — a soft or scalloped rail fails before the 85 mm outer ring does. The pin or shaft is part of the bearing system: harden it for RSTO/RNA22 positions, and size its deflection because the roller cannot compensate for a bent pin.

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 85 mm outer ring does.
• The pin or shaft is part of the bearing system: harden it for RSTO/RNA22 positions, and size its deflection because the roller cannot compensate for a bent pin.
• Full-complement NATV/NUTR/PWTR rollers make heat and flat-spot easily — slow continuous rotation is fine, stationary load on a turning track is not.