NATR-12-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-12-PPA model number is decoded

the 32 mm outside diameter runs on the track while the 12 mm bore takes the pin or shaft; the 15 mm overall width spreads the Hertzian contact over the outer ring published ratings C 6.6 kN and C0 8.5 kN already include the bending-stress correction for the unsupported outer ring — the C/C0 ratio of 0.78 is typical for support roller with flange rings, with inner ring executions fatigue load limit Pu 0.95 kN at 12 mm bore gives a specific load of 0.55 kN per mm; the limiting speed is 4,500 r/min the 15 mm width carries the load at 0.44 kN per mm of roller complement; section height 10.0 mm between bore and track surface determines the outer-ring bending stiffness mass 66 g over a 32x15 mm envelope works out to 0.138 g per mm² of projected area — a useful figure when sizing the drive inertia for medium-speed cam duty the 12 mm bore puts this in the small-to-medium transition where the roller complement is still needle-type but the outer ring is thick enough for moderate shock loads NATR adds pressed-on flange rings to the basic support roller; these locate the roller axially and absorb light side thrust, but they are not designed for continuous axial load PPA changes the outer-ring profile from cylindrical to crowned; the barrel shape lowers edge stress when the cam track is not perfectly parallel to the roller axis typical applications include paper mill web guide rollers, automatic assembly machine linkages and food processing line track rollers this size is commonly specified for paper mill web guide rollers and automatic assembly machine linkages, where the 32 mm track diameter and 12 mm bore fit standard cam and rail geometries in food processing line track rollers the 32 mm outer ring provides the rolling contact while the inner ring bore simplifies mounting; the 66 g mass is low enough for rapid indexing cycles 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 flange rings are a press fit on the inner ring; excessive axial preload during mounting can shift them and alter the internal clearance

Typical equipment & failure modes

Selection pitfalls — read before you substitute

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