3322-A bearing: complete specifications & equivalents
The 3322-A is a ISO 15 radial bearing sized 110 x 240 x 92.1 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 110 mm |
| Outer diameter D | 240 mm |
| Width B | 92.1 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 291 kN |
| Basic static load rating C0 | 305 kN |
| Fatigue load limit Pu | 9.8 kN |
| Reference speed (thermal) | 3000 rpm |
| Limiting speed (mechanical) | 2600 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 19000 g |
| Manufacturer designation | 3322 A |
| Standard | ISO 15 |
| Catalog version | SKF PUB BU/P1 17000/1 EN (Oct 2018) |
| Last verified | 2026-09-27 |
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.
Dimensions in inches & 3300-series range
| Bore d | 4.331 in |
|---|---|
| Outer diameter D | 9.449 in |
| Width B | 3.626 in |
| ISO bore code | 22 |
| Radial section height (D−d)/2 | 65 mm |
| Smallest bore in 3300-series | 15 mm |
| Largest outer diameter in 3300-series | 240 mm |
| Width range across 3300-series | 19–92.1 mm |
| Bore position in 3300-series (smallest first) | 20 of 20 |
| Bore above smallest 3300-series size | 95 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 3322 | ISO 15 | full Dimensions and internal design equivalent — standard interchange. | ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data. |
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 3322-A model number is decoded
3322 A is SKF's 110 mm-bore double-row angular-contact ball bearing of the 3300 series — two ball rows back-to-back for two-direction axial location in one unit, 110×240×92.1 mm. A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. with no cage suffix the double-row A execution uses the standard stamped steel ball-centred cage. Envelope 110×240×92.1 mm (4.331×9.449×3.626 in), 65.0 mm radial section height, C 291 kN, C0 305 kN, Pu 9.8 kN.reference speed 3,000 r/min (thermal) and limiting speed 2,600 r/min (mechanical), catalogue mass 19000 g. Selection figures for 3322 A: the static-to-dynamic ratio C0/C is 1.05, Pu 9.8 kN is about 3 % of C, and catalogue mass works out to roughly 173 g per millimetre of bore. At the printed limiting speed of 2,600 r/min the mean pitch diameter dm ≈ 175.0 mm implies a dn value around 455k mm·r/min; the 3,000 r/min reference speed is the thermal-planning figure under catalogue load. Speed-ratio note for this exact unit: the reference speed is 3,000 r/min against a 2,600 r/min limiting speed, i.e. a reference-to-limit ratio of 1.15.
Typical equipment & failure modes
Common applications
- cement and mineral processing drives
- heavy gearbox shafts carrying reversing thrust
- process pump and agitator drives
Known failure patterns
- false brinelling on the loaded row while the shaft stands idle under vibration
- snap-ring groove or two-piece-ring damage when the D execution is pressed home through the wrong ring
- stamped steel cage noise and pocket wear in marginal-lubrication starts, where a brass-cage execution would survive
- brinelling from pressing the ring home through the balls or from static overload
- mounting score marks when the bearing is cocked over a burr or keyway
Selection pitfalls — read before you substitute
- The D executions have a two-piece inner ring: mount both halves square to each other, never press on the outer ring, and keep the split faces clean during fitting.
- The double-row 3322 takes thrust in both directions by itself — that is the reason to choose it over two single-row bearings: one housing bore, one fit, built-in set geometry.
- The D executions have a two-piece inner ring: mount both halves square to each other, never press on the outer ring, and keep the split faces clean during fitting.
- Interference goes on the rotating ring (about m6 at 110 mm bore); the wide 92.1 mm ring is sensitive to tilted seats, so check squareness before clamping.
- Catalogue ratings are SKF PUB BU/P1 17000 figures for 3322 A as the double a steel execution; the other order numbers of the 3322 size are different products and may carry different ratings — always quote the full designation when purchasing.
Frequently asked questions
What are the dimensions and catalogue data of 3322-A?
3322 A measures 110 mm bore × 240 mm OD × 92.1 mm width (4.331 × 9.449 × 3.626 in), mass about 19000 g. SKF 17000 ratings: C 291 kN, C0 305 kN, Pu 9.8 kN, reference speed 3,000 r/min (thermal) and limiting speed 2,600 r/min (mechanical).
What does the A suffix mean?
A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. with no cage suffix the double-row A execution uses the standard stamped steel ball-centred cage.
Which fits should I use?
With a rotating inner ring use roughly m6 on the 110 mm shaft and H7 in the 240 mm housing; check the wide ring seats square because the 92.1 mm width is sensitive to tilt.
Why choose the double-row 3322 instead of two single-row bearings?
The double-row bearing locates the shaft in both axial directions in one unit, in one housing bore and with factory-controlled axial clearance — a more compact arrangement than a pair, with no field matching of ground faces. A single-row pair offers adjustable preload instead.
Reviewed & verified by the MPN Base engineering desk against source catalog SKF PUB BU/P1 17000/1 EN (Oct 2018) on 2026-09-27. Read our editorial & correction policy.