NATR25-PP 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 NATR25-PP model number is decoded

envelope 25×52×25 mm: the 52 mm outside diameter is the track-running surface — a thick-walled outer ring over a 25 mm bore — and the 25 mm width sets the contact width on the mating track the catalogue lists C 15.3 kN and C0 27 kN for the NATR yoke-type track roller with cage and axial guidance; the C/C0 ratio of 0.57 reflects a rolling-element pack sized for heavy static track loading, and the 13.5 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 3.6 kN at 25 mm bore, equivalent to 0.61 kN of dynamic rating per millimetre — the limiting speed is 1,800 r/min and, as for HR1 track rollers, no thermal reference speed is published the 25 mm bore takes the mounting pin or shaft; across the 25 mm contact width the dynamic rating works out to 0.61 kN per millimetre of rolling-element complement mass is 271 g, or 0.21 g per mm² of the 52×25 mm track envelope — inertia that the drive must accelerate on every index of the cam with a 25 mm pin bore the 25 mm width and 15.3 kN C rating suit high-cycle industrial machinery rather than instrument duty The cage can be damaged by heavy shock loads even though the rollers would survive — size to C, not just envelope The cage keeps the NATV at the higher limiting speed of 1,800 r/min for a track roller, with C 15.3 kN and C0 27 kN -PP protection suits cams and rails that are washed down or run in dust; exceeding the 1,800 r/min speed ceiling overheats the lips rather than just accelerating wear. Typical applications include packaging machine timing mechanisms, woodworking machine feed tracks and agricultural and textile cam followers, where the 52 mm track diameter and 15.3 kN dynamic rating match the duty. In packaging machine timing mechanisms the unit fits a compact 25 mm seat, and in woodworking machine feed tracks the 271 g mass keeps follower kinetics light. Designers also specify it for agricultural and textile cam followers, relying on the 25 mm width and the published 27 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. 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 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.
• 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.