3203-A-2RS1 bearing: complete specifications & equivalents

Specification table

Source: catalog reference (SKF PUB BU/P1 17000/1 EN (Oct 2018)) · extracted 2026-09-27

Parameters extracted from the official SKF Rolling Bearings catalogue (SKF PUB BU/P1 17000/1 EN (Oct 2018)); 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 3203-A-2RS1 model number is decoded

3203 A-2RS1 is the capped double-row angular-contact ball bearing for a 17 mm shaft, 17×40×17.5 mm, greased and sealed (or shielded) for life at the SKF works. A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2RS1 marks a contact NBR elastomer seal on each side, riding the inner ring: better fine-dust and moisture protection than a shield at the cost of seal drag and a lower speed ceiling. Envelope 17×40×17.5 mm (0.669×1.575×0.689 in), 11.5 mm radial section height, C 14.3 kN, C0 8.8 kN, Pu 0.365 kN.SKF publishes only the 12,000 r/min limiting speed for this execution, catalogue mass 100 g. Selection figures for 3203 A-2RS1: the static-to-dynamic ratio C0/C is 0.62, Pu 0.365 kN is about 3 % of C, and catalogue mass works out to roughly 6 g per millimetre of bore. Envelope economics: the 17.5 mm width over a 11.5 mm section yields 1.52 mm of ring width per section millimetre, and the bearing weighs 100 g for 14.3 kN of dynamic capacity — about 7 g per rated kN. Bore-to-OD planning: OD 40 over bore 17 is a 2.35× step for this size, and the 17.5 mm width gives a bore/width ratio of 0.97; use these ratios when housing space around the 17 mm shaft is the first constraint. Contact-seal execution note: the two NBR -2RS1 lips ride the inner-ring lands, sealing the factory grease against moisture and fine dust; the lips add running torque and set the lower limiting speed printed for this size, and the sealed cavity is maintenance-free by design (no relubrication path). The A-2Z shielded order number is the low-drag alternative for cleaner positions.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• The contact NBR seals add drag and a lower speed ceiling: no relubrication is provided for, so mounting cleanliness decides much of the real grease life.
• The shields/seals do not make the bearing waterproof under immersion or pressure washing; select external sealing for wet or wash-down duty.
• The capped speed ceiling is 12,000 r/min — seal drag and grease life govern, which is why SKF publishes no thermal reference speed for A-2RS1.
• Never wash 3203-A-2RS1 in solvent: the lifetime grease fill cannot be replaced once flushed out.
• Catalogue ratings are SKF PUB BU/P1 17000 figures for 3203 A-2RS1 as the double contactsealed execution; the other order numbers of the 3203 size are different products and may carry different ratings — always quote the full designation when purchasing.