STO35 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 STO35 model number is decoded

envelope 35×72×19.8 mm: the 72 mm outside diameter is the track-running surface — a thick-walled outer ring over a 35 mm bore — and the 19.8 mm width sets the contact width on the mating track the catalogue lists C 25 kN and C0 41 kN for the STO yoke-type track roller with inner ring, without axial guidance; the C/C0 ratio of 0.61 reflects a rolling-element pack sized for heavy static track loading, and the 18.5 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 5.5 kN at 35 mm bore, equivalent to 0.71 kN of dynamic rating per millimetre — the limiting speed is 1,100 r/min and, as for HR1 track rollers, no thermal reference speed is published the 35 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 441 g, or 0.31 g per mm² of the 72×19.8 mm track envelope — inertia that the drive must accelerate on every index of the cam at 35 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 STO rollers are used on cam tracks and rail guidance where sealing is handled externally; the open form is easy to relubricate through the pin where drilled At 441 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 Typical applications include automotive welding jig rollers, conveyor transfer and diverting stations and automatic assembly machine carriages, where the 72 mm track diameter and 25 kN dynamic rating match the duty. In automotive welding jig rollers the unit fits a compact 35 mm seat, and in conveyor transfer and diverting stations the 441 g mass keeps follower kinetics light. Designers also specify it for automatic assembly machine carriages, relying on the 19.8 mm width and the published 41 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. 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

• The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading.
• Yoke lugs must support the pin on both sides over its full length — single-sided support turns the pin into a cantilever beam.
• Flangeless STO/RSTO/RNA22/NA22 rollers need external axial location; circlips or shoulders must control end float or the roller walks off the track.