NA-2204-2RS 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 NA-2204-2RS model number is decoded

the 47 mm outside diameter runs on the track while the 20 mm bore takes the pin or shaft; the 18 mm overall width spreads the Hertzian contact over the outer ring published ratings C 16.1 kN and C0 18 kN already include the bending-stress correction for the unsupported outer ring — the C/C0 ratio of 0.89 is typical for sealed support roller without flange rings, with inner ring executions fatigue load limit Pu 2.16 kN at 20 mm bore gives a specific load of 0.81 kN per mm; the limiting speed is 4,000 r/min the 18 mm width carries the load at 0.89 kN per mm of roller complement; section height 13.5 mm between bore and track surface determines the outer-ring bending stiffness mass 180 g over a 47x18 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 at 20 mm bore this size balances load capacity and envelope compactness — a frequent pick for packaging machines and printing press linkages NA 22..2RS names the sealed support roller: contact seals on both sides retain grease and exclude contamination, at the cost of a lower 4000 r/min limiting speed than the open STO size typical applications include material handling lift and lower tracks, sheet-metal forming press feeds and textile machine cam drives this size is commonly specified for material handling lift and lower tracks and sheet-metal forming press feeds, where the 47 mm track diameter and 20 mm bore fit standard cam and rail geometries in textile machine cam drives the 47 mm outer ring provides the rolling contact while the inner ring bore simplifies mounting; the 180 g mass is low enough for rapid indexing cycles NBR seals degrade in contact with certain synthetic lubricants and solvents; verify compatibility before exposing the roller to process chemicals the compact envelope and sealed construction make this size sensitive to over-greasing during manufacture — excess grease churns and overheats at speed

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• sealed rollers are greased for life — adding a relubrication fitting is pointless and can force the seals open
• NBR seals degrade in contact with certain synthetic lubricants and solvents; verify compatibility before exposing the roller to process chemicals
• the contact seals add a small running torque; in low-power cam drives the drag can be significant