3205-A-2Z 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 3205-A-2Z model number is decoded

3205 A-2Z is the capped double-row angular-contact ball bearing for a 25 mm shaft, 25×52×20.6 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. -2Z marks a sheet-metal shield on each side: non-contacting, grease-retention and dust protection with negligible drag, the bearing remaining open-style relubricatable only through the shield clearance. Envelope 25×52×20.6 mm (0.984×2.047×0.811 in), 13.5 mm radial section height, C 21.6 kN, C0 14.3 kN, Pu 0.6 kN.SKF publishes only the 12,000 r/min limiting speed for this execution, catalogue mass 180 g. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 12,000 r/min and no separate thermal reference is published; at dm ≈ 38.5 mm the corresponding dn is approximately 462k mm·r/min. Envelope economics: the 20.6 mm width over a 13.5 mm section yields 1.53 mm of ring width per section millimetre, and the bearing weighs 180 g for 21.6 kN of dynamic capacity — about 8 g per rated kN. Speed-ratio note for this exact unit: no thermal reference speed is listed (seal/grease life governs), so the 12,000 r/min limiting value is the single published ceiling. Shielded execution note: the two sheet-metal -2Z covers clip into the outer ring without contacting the inner ring, giving grease retention and coarse-dust protection at virtually no friction; the cavity is factory-greased and the shield arrangement suits dry, moderately dusty positions rather than wash-down duty, where the A-2RS1 contact-seal order number is the alternative.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• The non-contact shields cap the speed with negligible drag: no relubrication is provided for, so mounting cleanliness decides much of the real grease life.
• Open 3205 and capped 3205-A-2Z share the 25×52×20.6 mm envelope and 21.6/14.3 kN ratings — the choice is maintenance access and contamination, not capacity.
• 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-2Z.
• Fit and fillet rules are unchanged from the open double-row 3205: k5 on a 25 mm rotating shaft, radii clearing the chamfer.
• Catalogue ratings are SKF PUB BU/P1 17000 figures for 3205 A-2Z as the double shielded execution; the other order numbers of the 3205 size are different products and may carry different ratings — always quote the full designation when purchasing.