NATR-6-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-6-PPA model number is decoded

the 19 mm outside diameter runs on the track while the 6 mm bore takes the pin or shaft; the 12 mm overall width spreads the Hertzian contact over the outer ring published ratings C 3.47 kN and C0 3.8 kN already include the bending-stress correction for the unsupported outer ring — the C/C0 ratio of 0.91 is typical for support roller with flange rings, with inner ring executions fatigue load limit Pu 0.415 kN at 6 mm bore gives a specific load of 0.58 kN per mm; the limiting speed is 5,600 r/min the 12 mm width carries the load at 0.29 kN per mm of roller complement; section height 6.5 mm between bore and track surface determines the outer-ring bending stiffness mass 19 g over a 19x12 mm envelope works out to 0.083 g per mm² of projected area — a useful figure when sizing the drive inertia for medium-high-speed cam duty with a 6 mm bore this is one of the smallest sizes listed; the reduced section height limits the outer-ring bending stiffness, so track alignment must be held closely reading NATR: needle roller support roller with integral flange rings; the 19 mm outer ring runs on the track while the flanges keep the roller centred without separate thrust washers reading the PPA suffix: crowned outer ring — the track contact is barrel-shaped to tolerate angular misalignment between the roller axis and the track typical applications include sheet-metal forming press feeds, textile machine cam drives and agricultural equipment cam followers this size is commonly specified for sheet-metal forming press feeds and textile machine cam drives, where the 19 mm track diameter and 6 mm bore fit standard cam and rail geometries in agricultural equipment cam followers the 19 mm outer ring provides the rolling contact while the inner ring bore simplifies mounting; the 19 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

• cage guidance (NATR) is less tolerant of shock than full complement (NATV); heavy impact can crack the cage and release rollers into the mechanism
• the cage material is typically polyamide or steel; at temperatures above 100 degC polyamide cages soften and lose guidance function
• the flange rings are a press fit on the inner ring; excessive axial preload during mounting can shift them and alter the internal clearance