NUTR-20-A 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 NUTR-20-A model number is decoded

the 47 mm outside diameter runs on the track while the 20 mm bore takes the pin or shaft; the 25 mm overall width spreads the Hertzian contact over the outer ring published ratings C 28.6 kN and C0 33.5 kN already include the bending-stress correction for the unsupported outer ring — the C/C0 ratio of 0.85 is typical for double-row full-complement support roller, no integral flange executions fatigue load limit Pu 3.9 kN at 20 mm bore gives a specific load of 1.43 kN per mm; the limiting speed is 3,800 r/min the 25 mm width carries the load at 1.14 kN per mm of roller complement; section height 13.5 mm between bore and track surface determines the outer-ring bending stiffness mass 250 g over a 47x25 mm envelope works out to 0.213 g per mm² of projected area — a useful figure when sizing the drive inertia for medium-speed cam duty the 20 mm bore falls in the small-size band, the most common choice for general-purpose cam followers and light conveyor transfer rollers reading NUTR: twin-row cylindrical roller support roller, no cage, no integral flange; the 47 mm track surface and 20 mm bore carry the heaviest radial ratings in this catalogue section reading the A suffix: improved design execution with optimised roller complement and surface finish for better performance at the same envelope dimensions typical applications include automatic assembly machine linkages, food processing line track rollers and printing press roller followers this size is commonly specified for automatic assembly machine linkages and food processing line track rollers, where the 47 mm track diameter and 20 mm bore fit standard cam and rail geometries in printing press roller followers the 47 mm outer ring provides the rolling contact while the inner ring bore simplifies mounting; the 250 g mass is low enough for rapid indexing cycles the double-row full complement is sensitive to misalignment; a bent shaft or angled track creates uneven load between the rows and early spalling relubrication is difficult because the roller rows are packed; follow the greasing interval strictly

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• the outer ring has no integral flange between the two roller rows — axial guidance depends entirely on the pressed-on flange rings, which can shift under heavy side load
• the double-row full complement is sensitive to misalignment; a bent shaft or angled track creates uneven load between the rows and early spalling
• relubrication is difficult because the roller rows are packed; follow the greasing interval strictly