NATR17-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 NATR17-PP model number is decoded

envelope 17×40×21 mm: the 40 mm outside diameter is the track-running surface — a thick-walled outer ring over a 17 mm bore — and the 21 mm width sets the contact width on the mating track the catalogue lists C 10.9 kN and C0 16 kN for the NATR yoke-type track roller with cage and axial guidance; the C/C0 ratio of 0.68 reflects a rolling-element pack sized for heavy static track loading, and the 11.5 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 2.13 kN at 17 mm bore, equivalent to 0.64 kN of dynamic rating per millimetre — the limiting speed is 2,900 r/min and, as for HR1 track rollers, no thermal reference speed is published the 17 mm bore takes the mounting pin or shaft; across the 21 mm contact width the dynamic rating works out to 0.52 kN per millimetre of rolling-element complement mass is 139 g, or 0.17 g per mm² of the 40×21 mm track envelope — inertia that the drive must accelerate on every index of the cam with a 17 mm pin bore the 21 mm width and 10.9 kN C rating suit high-cycle industrial machinery rather than instrument duty NATR is the caged yoke-type track roller: a needle roller and cage assembly runs inside the rib-guided thick-walled outer ring on the 17 mm inner-ring bore -PP protection suits cams and rails that are washed down or run in dust; exceeding the 2,900 r/min speed ceiling overheats the lips rather than just accelerating wear. Typical applications include automatic assembly machine carriages, automotive welding jig rollers and linear rail and profile track guidance, where the 40 mm track diameter and 10.9 kN dynamic rating match the duty. In automatic assembly machine carriages the unit fits a compact 17 mm seat, and in automotive welding jig rollers the 139 g mass keeps follower kinetics light. Designers also specify it for linear rail and profile track guidance, relying on the 21 mm width and the published 16 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 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.

Typical equipment & failure modes

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 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.
• Sealed PP/2RSR units are greased for life: never add a grease nipple, and respect the lower limiting speed imposed by the rubbing lips.