NATR-35-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 NATR-35-PPA model number is decoded

the 72 mm outside diameter runs on the track while the 35 mm bore takes the pin or shaft; the 29 mm overall width spreads the Hertzian contact over the outer ring published ratings C 24.6 kN and C0 43 kN already include the bending-stress correction for the unsupported outer ring — the C/C0 ratio of 0.57 is typical for support roller with flange rings, with inner ring executions fatigue load limit Pu 5.3 kN at 35 mm bore gives a specific load of 0.70 kN per mm; the limiting speed is 1,600 r/min the 29 mm width carries the load at 0.85 kN per mm of roller complement; section height 18.5 mm between bore and track surface determines the outer-ring bending stiffness mass 550 g over a 72x29 mm envelope works out to 0.263 g per mm² of projected area — a useful figure when sizing the drive inertia for low-speed cam duty at 35 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 NATR identifies a support roller with axial flange rings pressed onto the inner ring: the flanges guide the roller axially and let it handle light thrust from skewed tracks or misaligned cams the PPA suffix specifies a crowned (radius) outer-ring running surface instead of the standard cylindrical profile — the crown distributes edge stress when the track is not perfectly aligned typical applications include agricultural equipment cam followers, packaging machine timing cams and glass processing line conveyors this size is commonly specified for agricultural equipment cam followers and packaging machine timing cams, where the 72 mm track diameter and 35 mm bore fit standard cam and rail geometries in glass processing line conveyors the 72 mm outer ring provides the rolling contact while the inner ring bore simplifies mounting; the 550 g mass is low enough for rapid indexing cycles the cage material is typically polyamide or steel; at temperatures above 100 degC polyamide cages soften and lose guidance function the pressed-on flange rings are not designed for continuous axial load — side thrust from a skewed track will eventually dislodge them

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• do not use the flange faces as thrust surfaces for external components — the pressed joint is designed for guidance, not for transmitting axial force
• the cage material is typically polyamide or steel; at temperatures above 100 degC polyamide cages soften and lose guidance function
• the pressed-on flange rings are not designed for continuous axial load — side thrust from a skewed track will eventually dislodge them