NATV25 bearing: complete specifications & equivalents
The NATV25 is a ISO 15 radial bearing sized 25 x 52 x 25 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | FAG |
| Bore diameter d | 25 mm |
| Outer diameter D | 52 mm |
| Width B | 25 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | none |
| Basic dynamic load rating C | 20.2 kN |
| Basic static load rating C0 | 44.5 kN |
| Fatigue load limit Pu | 6.3 kN |
| Limiting speed (mechanical) | 1000 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 285 g |
| Manufacturer designation | NATV25 |
| Standard | ISO 15 |
| Catalog version | HR1 2026-09-25 |
| Last verified | 2026-09-30 |
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.
Dimensions in inches & natv-series range
| Bore d | 0.984 in |
|---|---|
| Outer diameter D | 2.047 in |
| Width B | 0.984 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 13.5 mm |
| Smallest bore in natv-series | 5 mm |
| Largest outer diameter in natv-series | 90 mm |
| Width range across natv-series | 12–32 mm |
| Bore position in natv-series (smallest first) | 9 of 13 |
| Bore above smallest natv-series size | 20 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| NATV25-PP | FAG | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same envelope and mounting; open vs -PP sealed execution — the three-stage seal excludes contamination at the cost of a small drag torque and lower limiting speed. |
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 NATV25 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 20.2 kN and C0 44.5 kN for the NATV full-complement yoke-type track roller with axial guidance; the C/C0 ratio of 0.45 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 6.3 kN at 25 mm bore, equivalent to 0.81 kN of dynamic rating per millimetre — the limiting speed is 1,000 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 0.81 kN per millimetre of rolling-element complement mass is 285 g, or 0.22 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 20.2 kN C rating suit high-cycle industrial machinery rather than instrument duty At 25 mm bore and 285 g the roller mounts on a standard pin; yoke mounting means the pin, not a stud, carries the clamp load Typical applications include linear rail and profile track guidance, automatic assembly machine carriages and glass and ceramic line conveyors, where the 52 mm track diameter and 20.2 kN dynamic rating match the duty. In linear rail and profile track guidance the unit fits a compact 25 mm seat, and in automatic assembly machine carriages the 285 g mass keeps follower kinetics light. Designers also specify it for glass and ceramic line conveyors, relying on the 25 mm width and the published 44.5 kN static rating. 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. The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading.
Typical equipment & failure modes
Common applications
- agricultural and textile cam followers
- printing press sheet-transfer grippers
- robotic arm linear axes
- conveyor transfer and diverting stations
Known failure patterns
- outer-ring fatigue cracking across the unsupported track zone under excessive static load
- track-side brinelling when the mating rail is softer than the roller running surface
- flat spots from standing loads or very short oscillating strokes on full-complement rollers
- seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)
- edge wear from skewed tracks that exceed the crowned-profile correction range
- pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin
- roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float
- contamination entry through open sides in dusty or wash-down environments
- cage fracture in caged NATR/STO rollers exposed to heavy shock
Selection pitfalls — read before you substitute
- 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.
- The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading.
- Check the mating track hardness and flatness — a soft or scalloped rail fails before the 52 mm outer ring does.
Frequently asked questions
What are the dimensions of the NATV25?
The NATV25 is a NATV full-complement yoke-type track roller with axial guidance with 52 mm outside diameter, 25 mm bore and 25 mm width, envelope 25×52×25 mm. Mass is 285 g.
What does the NATV25 designation mean in the FAG/INA HR1 catalogue?
NATV25 identifies this NATV full-complement yoke-type track roller with axial guidance in the Schaeffler HR1 rolling bearings catalogue. The envelope is 25×52×25 mm and the catalogue ratings are C 20.2 kN, C0 44.5 kN, Cur 6.3 kN.
What is the load capacity of the NATV25?
The basic dynamic load rating C is 20.2 kN and the basic static load rating C0 is 44.5 kN; the fatigue load limit Cur is 6.3 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track.
What is the maximum speed of the NATV25?
HR1 lists a limiting speed of 1,000 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure.
What must the mating track and pin look like for the NATV25?
The track should be flat, harder than the roller contact and clean; the crowned 52 mm outer surface tolerates only small angular error. The inner ring lets the 25 mm pin run at normal machined tolerance; lateral guidance comes from the adjacent structure on flangeless executions.
Reviewed & verified by the MPN Base engineering desk against source catalog HR1 2026-09-25 on 2026-09-30. Read our editorial & correction policy.