3303-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 3303-A-2Z model number is decoded

3303 A-2Z is the capped double-row angular-contact ball bearing for a 17 mm shaft, 17×47×22.2 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 17×47×22.2 mm (0.669×1.85×0.874 in), 15.0 mm radial section height, C 21.6 kN, C0 12.7 kN, Pu 0.54 kN.SKF publishes only the 14,000 r/min limiting speed for this execution, catalogue mass 180 g. The 0.54 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 21.6/12.7 kN ratings and 180 g mass this execution carries about 1.27 kN of C per millimetre of bore. Mass and section check: 180 g inside the 17×47×22.2 mm outline leaves a 15.0 mm radial section, and the 12.7 kN static rating is 0.59× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. Bore-to-OD planning: OD 47 over bore 17 is a 2.76× step for this size, and the 22.2 mm width gives a bore/width ratio of 0.77; use these ratios when housing space around the 17 mm shaft is the first constraint. 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 capped speed ceiling is 14,000 r/min — seal drag and grease life govern, which is why SKF publishes no thermal reference speed for A-2Z.
• 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.
• Fit and fillet rules are unchanged from the open double-row 3303: j5 on a 17 mm rotating shaft, radii clearing the chamfer.
• 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.
• Catalogue ratings are SKF PUB BU/P1 17000 figures for 3303 A-2Z as the double shielded execution; the other order numbers of the 3303 size are different products and may carry different ratings — always quote the full designation when purchasing.