STO10 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 STO10 model number is decoded

envelope 10×30×11.8 mm: the 30 mm outside diameter is the track-running surface — a thick-walled outer ring over a 10 mm bore — and the 11.8 mm width sets the contact width on the mating track the catalogue lists C 8.4 kN and C0 9.5 kN for the STO yoke-type track roller with inner ring, without axial guidance; the C/C0 ratio of 0.88 reflects a rolling-element pack sized for heavy static track loading, and the 10.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 1.39 kN at 10 mm bore, equivalent to 0.84 kN of dynamic rating per millimetre — the limiting speed is 5,500 r/min and, as for HR1 track rollers, no thermal reference speed is published the 10 mm bore takes the mounting pin or shaft; across the 11.8 mm contact width the dynamic rating works out to 0.71 kN per millimetre of rolling-element complement mass is 49 g, or 0.14 g per mm² of the 30×11.8 mm track envelope — inertia that the drive must accelerate on every index of the cam the 10 mm pin bore sits in the miniature band; at 11.8 mm wide the STO10 is built into compact cam drives, indexing pawls and light linkages At 49 g the roller suits small indexing and transfer mechanisms; without flanges a bent pin or angled track produces edge loading at the outer-ring lips Because the inner ring is supplied, the mounting pin only needs standard bearing-seat tolerance and surface — hardening to raceway quality is unnecessary Typical applications include packaging machine timing mechanisms, woodworking machine feed tracks and agricultural and textile cam followers, where the 30 mm track diameter and 8.4 kN dynamic rating match the duty. In packaging machine timing mechanisms the unit fits a compact 10 mm seat, and in woodworking machine feed tracks the 49 g mass keeps follower kinetics light. Designers also specify it for agricultural and textile cam followers, relying on the 11.8 mm width and the published 9.5 kN static rating. 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.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• 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.
• 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.