RSTO40 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 RSTO40 model number is decoded

envelope 50×80×19.8 mm: the 80 mm outside diameter is the track-running surface — a thick-walled outer ring over a 50 mm bore — and the 19.8 mm width sets the contact width on the mating track the catalogue lists C 23.7 kN and C0 40 kN for the RSTO yoke-type track roller without inner ring, without axial guidance; the C/C0 ratio of 0.59 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 50 mm bore, equivalent to 0.47 kN of dynamic rating per millimetre — the limiting speed is 850 r/min and, as for HR1 track rollers, no thermal reference speed is published the 50 mm bore takes the mounting pin or shaft; across the 19.8 mm contact width the dynamic rating works out to 1.20 kN per millimetre of rolling-element complement mass is 420 g, or 0.27 g per mm² of the 80×19.8 mm track envelope — inertia that the drive must accelerate on every index of the cam at 50 mm pin bore this is a mainstream industrial size — conveyor drives, winches and medium gearboxes use the 19.8 mm width as a standard mounting space With C 23.7 kN and C0 40 kN the roller accepts track loads directly; the 850 r/min limiting speed is the only speed figure HR1 publishes for track rollers At 420 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 automatic assembly machine carriages, automotive welding jig rollers and linear rail and profile track guidance, where the 80 mm track diameter and 23.7 kN dynamic rating match the duty. In automatic assembly machine carriages the unit fits a compact 50 mm seat, and in automotive welding jig rollers the 420 g mass keeps follower kinetics light. Designers also specify it for linear rail and profile track guidance, relying on the 19.8 mm width and the published 40 kN static rating. 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. Sealed PP/2RSR units are greased for life: never add a grease nipple, and respect the lower limiting speed imposed by the rubbing lips.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• 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.
• Sealed PP/2RSR units are greased for life: never add a grease nipple, and respect the lower limiting speed imposed by the rubbing lips.
• Yoke lugs must support the pin on both sides over its full length — single-sided support turns the pin into a cantilever beam.