NATR-8-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-8-PPA model number is decoded

the 24 mm outside diameter runs on the track while the 8 mm bore takes the pin or shaft; the 15 mm overall width spreads the Hertzian contact over the outer ring published ratings C 5.28 kN and C0 6.1 kN already include the bending-stress correction for the unsupported outer ring — the C/C0 ratio of 0.87 is typical for support roller with flange rings, with inner ring executions fatigue load limit Pu 0.695 kN at 8 mm bore gives a specific load of 0.66 kN per mm; the limiting speed is 5,000 r/min the 15 mm width carries the load at 0.35 kN per mm of roller complement; section height 8.0 mm between bore and track surface determines the outer-ring bending stiffness mass 38 g over a 24x15 mm envelope works out to 0.106 g per mm² of projected area — a useful figure when sizing the drive inertia for medium-high-speed cam duty the 8 mm bore places this in the smallest catalogue tier — typical for instrument cams, small conveyors and precision linear guides where space is at a premium the NATR prefix denotes the flanged support roller — two pressed steel flange rings on the 8 mm bore locate the needle roller complement laterally, so the roller can tolerate some track misalignment PPA denotes the crowned running surface: the 24 mm OD is ground to a large radius rather than straight, reducing edge loading on misaligned cam tracks typical applications include cam mechanisms and indexing drives, material handling lift and lower tracks and sheet-metal forming press feeds this size is commonly specified for cam mechanisms and indexing drives and material handling lift and lower tracks, where the 24 mm track diameter and 8 mm bore fit standard cam and rail geometries in sheet-metal forming press feeds the 24 mm outer ring provides the rolling contact while the inner ring bore simplifies mounting; the 38 g mass is low enough for rapid indexing cycles the flanges reduce the available track width by their own thickness; check the cam channel width against the B dimension, not just the outer ring width cage guidance (NATR) is less tolerant of shock than full complement (NATV); heavy impact can crack the cage and release rollers into the mechanism

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 flanges reduce the available track width by their own thickness; check the cam channel width against the B dimension, not just the outer ring width
• the cage material is typically polyamide or steel; at temperatures above 100 degC polyamide cages soften and lose guidance function