NA-2205-2RS 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-2205-2RS model number is decoded

the 52 mm outside diameter runs on the track while the 25 mm bore takes the pin or shaft; the 18 mm overall width spreads the Hertzian contact over the outer ring published ratings C 16.8 kN and C0 20 kN already include the bending-stress correction for the unsupported outer ring — the C/C0 ratio of 0.84 is typical for sealed support roller without flange rings, with inner ring executions fatigue load limit Pu 2.4 kN at 25 mm bore gives a specific load of 0.67 kN per mm; the limiting speed is 3,400 r/min the 18 mm width carries the load at 0.93 kN per mm of roller complement; section height 13.5 mm between bore and track surface determines the outer-ring bending stiffness mass 210 g over a 52x18 mm envelope works out to 0.224 g per mm² of projected area — a useful figure when sizing the drive inertia for medium-speed cam duty the 25 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 NA 22..2RS is the sealed, greased-for-life variant of the flangeless support roller; the NBR contact lips ride on the inner ring and protect the needle complement in dirty or humid environments typical applications include agricultural equipment cam followers, packaging machine timing cams and glass processing line conveyors this size is commonly specified for agricultural equipment cam followers and packaging machine timing cams, where the 52 mm track diameter and 25 mm bore fit standard cam and rail geometries in glass processing line conveyors the 52 mm outer ring provides the rolling contact while the inner ring bore simplifies mounting; the 210 g mass is low enough for rapid indexing cycles the seal recesses reduce the effective roller complement width; do not substitute an open STO size without checking the reduced C rating NBR seals degrade in contact with certain synthetic lubricants and solvents; verify compatibility before exposing the roller to process chemicals

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• the contact seals add a small running torque; in low-power cam drives the drag can be significant
• the seal recesses reduce the effective roller complement width; do not substitute an open STO size without checking the reduced C rating
• NBR seals degrade in contact with certain synthetic lubricants and solvents; verify compatibility before exposing the roller to process chemicals