NATV-50-PPA bearing: complete specifications & equivalents

Specification table

Source: catalog reference (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 15 support rollers / ch. 16 cam followers) · extracted 2026-09-30

Parameters extracted from the official SKF Rolling Bearings catalogue (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 15 support rollers / ch. 16 cam followers); SKF® and SKF Explorer® are trademarks of AB SKF, used here for identification only — mpnbase is not an authorized SKF distributor. Boundary dimensions are ISO 15 interchangeable; current production values may differ, verify at skf.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 NATV-50-PPA model number is decoded

the 90 mm outside diameter runs on the track while the 50 mm bore takes the pin or shaft; the 32 mm overall width spreads the Hertzian contact over the outer ring published ratings C 39.1 kN and C0 93 kN already include the bending-stress correction for the unsupported outer ring — the C/C0 ratio of 0.42 is typical for full-complement support roller with flange rings, with inner ring executions fatigue load limit Pu 11.6 kN at 50 mm bore gives a specific load of 0.78 kN per mm; the limiting speed is 850 r/min the 32 mm width carries the load at 1.22 kN per mm of roller complement; section height 20.0 mm between bore and track surface determines the outer-ring bending stiffness mass 970 g over a 90x32 mm envelope works out to 0.337 g per mm² of projected area — a useful figure when sizing the drive inertia for low-speed cam duty at 50 mm bore this size crosses into the range where double-row full-complement executions (NUTR/PWTR/NUKR) offer substantially higher C ratings than the single-row needle designs the NATV designation means full complement of needle rollers with flange rings — maximum load capacity in the 90 mm envelope, traded against the reduced 850 r/min speed limit PPA denotes the crowned running surface: the 90 mm OD is ground to a large radius rather than straight, reducing edge loading on misaligned cam tracks typical applications include linear guide and track systems, robotic arm track guidance and paper mill web guide rollers this size is commonly specified for linear guide and track systems and robotic arm track guidance, where the 90 mm track diameter and 50 mm bore fit standard cam and rail geometries in paper mill web guide rollers the 90 mm outer ring provides the rolling contact while the inner ring bore simplifies mounting; the 970 g mass is low enough for rapid indexing cycles full-complement rollers generate more friction and heat — the lower limiting speed is a hard thermal limit, not a suggestion without a cage the rollers can skew under momentary unloading, leading to edge loading and premature raceway pitting

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• without a cage the rollers can skew under momentary unloading, leading to edge loading and premature raceway pitting
• full-complement rollers generate more friction and heat — the lower limiting speed is a hard thermal limit, not a suggestion
• the higher static capacity invites overloading; remember the dynamic C rating still governs fatigue life