STO8-TV 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 STO8-TV model number is decoded

envelope 8×24×9.8 mm: the 24 mm outside diameter is the track-running surface — a thick-walled outer ring over a 8 mm bore — and the 9.8 mm width sets the contact width on the mating track the catalogue lists C 4.2 kN and C0 5.6 kN for the STO yoke-type track roller with inner ring, without axial guidance; the C/C0 ratio of 0.75 reflects a rolling-element pack sized for heavy static track loading, and the 8.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 0.8 kN at 8 mm bore, equivalent to 0.53 kN of dynamic rating per millimetre — the limiting speed is 8,000 r/min and, as for HR1 track rollers, no thermal reference speed is published the 8 mm bore takes the mounting pin or shaft; across the 9.8 mm contact width the dynamic rating works out to 0.43 kN per millimetre of rolling-element complement mass is 26 g, or 0.11 g per mm² of the 24×9.8 mm track envelope — inertia that the drive must accelerate on every index of the cam the 8 mm pin bore sits in the miniature band; at 9.8 mm wide the STO8-TV is built into compact cam drives, indexing pawls and light linkages Reading STO: yoke roller with inner ring, no flanges; the 9.8 mm-wide unit is located laterally by housing shoulders or circlips rather than by integral ribs The thick-walled 24 mm outer ring rolls directly on a flat track while the inner ring protects an ordinary machined pin from the needle-roller contact Reading -TV: an injection-moulded polyamide cage guides the rolling elements — the lightweight choice that keeps the mass at 26 g in the 24 mm envelope. Typical applications include agricultural and textile cam followers, packaging machine timing mechanisms and robotic arm linear axes, where the 24 mm track diameter and 4.2 kN dynamic rating match the duty. In agricultural and textile cam followers the unit fits a compact 8 mm seat, and in packaging machine timing mechanisms the 26 g mass keeps follower kinetics light. Designers also specify it for robotic arm linear axes, relying on the 9.8 mm width and the published 5.6 kN static rating. Sealed PP/2RSR units are greased for life: never add a grease nipple, and respect the lower limiting speed imposed by the rubbing lips. 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

• Sealed PP/2RSR units are greased for life: never add a grease nipple, and respect the lower limiting speed imposed by the rubbing lips.
• Flangeless STO/RSTO/RNA22/NA22 rollers need external axial location; circlips or shoulders must control end float or the roller walks off the track.
• Check the mating track hardness and flatness — a soft or scalloped rail fails before the 24 mm outer ring does.