33030 bearing: complete specifications & equivalents
The 33030 is a ISO 355 radial bearing sized 150 x 225 x 59 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 150 mm |
| Outer diameter D | 225 mm |
| Width B | 59 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 487 kN |
| Basic static load rating C0 | 865 kN |
| Fatigue load limit Pu | 85 kN |
| Reference speed (thermal) | 2200 rpm |
| Limiting speed (mechanical) | 2600 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 8050 g |
| Manufacturer designation | SKF 33030 |
| Standard | ISO 355 |
| Catalog version | SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB |
| Last verified | 2026-09-26 |
Source: catalog reference (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB) · extracted 2026-09-26
Parameters extracted from the official SKF Rolling Bearings catalogue (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB); 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 & 33000-series range
| Bore d | 5.906 in |
|---|---|
| Outer diameter D | 8.858 in |
| Width B | 2.323 in |
| ISO bore code | 30 |
| Radial section height (D−d)/2 | 37.5 mm |
| Smallest bore in 33000-series | 50 mm |
| Largest outer diameter in 33000-series | 225 mm |
| Width range across 33000-series | 24–59 mm |
| Bore position in 33000-series (smallest first) | 16 of 16 |
| Bore above smallest 33000-series size | 100 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 33030 | ISO 15 | full Dimensions and internal design equivalent — standard interchange. | ISO 355 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 33030 model number is decoded
Ordering number SKF 33030 in SKF catalogue PUB BU/P1 17000 denotes a single-row tapered roller bearing for a 150 mm shaft, slim light section, with an open pressed-steel-cage execution and one-direction axial capacity.On the SKF nameplate, 33030 follows the ISO 355 convention: 3 for the tapered-roller type, 30 for the slim light section, final digits 30 for the 150 mm bore. The SKF catalogue adds the ISO 355 dimension-series code after the bare number (e.g. 2EE); it is the dimensional series, not a separate part number. With C 487 kN and C0 865 kN, the 33030 pair-sizing check is dominated by the axial share: keep the equivalent load P below the rating at the required L10, remembering one bearing alone cannot cover reversing thrust at 2,600 r/min. Specify pairs rather than single units wherever thrust reverses: the tapered contact of 33030 generates an induced axial load under radial force, and an unpaired bearing on a reversing shaft will run slack and fret its seat.
Typical equipment & failure modes
Common applications
- marine propulsion gearboxes
- large industrial mixer shafts
- offshore winch and drawworks drums
- rolling-mill roll-neck bearings
Known failure patterns
- cup or cone misalignment when the separable rings are not seated square during mounting
- loose cup rotation in the housing when the specified press fit is not achieved
- false brinelling on idle paired sets exposed to machine vibration
- roller large-end smearing against the cone rib after EP lubricant film failure
- pressed-steel cage wear or fracture after prolonged running above the limiting speed
- edge loading from shaft deflection or housing misalignment
Selection pitfalls — read before you substitute
- At 150 mm bore the cone mass is high enough that cocking during mounting damages the cage and rib; guide the ring square, confirm seat contact around the full circumference, and re-check setting after the first thermal cycle of the paired set.
- The 330 series at 150 mm bore (225×59 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 30230 of the same bore — confirm the L10 margin before downsizing into it.
- When the outer ring rotates, reverse the fit logic and provide cup location; the tapered contact of 33030 pushes the rings apart under load, so a non-located cup walks its seat even when the shaft is fixed.
- Do not mix brands or executions inside one 33030 pair — matched sets are ground for a specific setting, and pairing a SKF basic unit with a different suffix variant will not share the setting evenly.
- Catalogue reference speed and limiting speed are different limits: the 2,200 r/min reference is a thermal criterion under load, while the 2,600 r/min limiting value is the mechanical ceiling — observe both.
- The 487/865 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.
- SKF lists several executions of 33030 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 33030 designation when purchasing and match the execution to the mounting arrangement.
Frequently asked questions
What are the dimensions and catalogue data of 33030?
The SKF 33030 is a single-row tapered roller bearing with 150 mm bore, 225 mm outer diameter and 59 mm width (5.906 × 8.858 × 2.323 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 487 kN, C0 865 kN, fatigue load limit Pu 85 kN, reference speed 2,200 r/min, limiting speed 2,600 r/min, mass about 8050 g. It is an open, separable bearing with a pressed-steel cage.
How does the 33030 bore code work?
The last two digits of 33030 are bore code 30, so 30 × 5 = 150 mm bore. The 225 mm OD and 59 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code.
What do the 33030 series and basic execution designations mean?
The leading 3 marks a single-row tapered roller bearing; the second digit 30 is the ISO 355 series (slim light section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution.
Can a single 33030 take axial load in both directions?
No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared.
How does 33030 compare with a ball bearing of the same bore?
A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 33030 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting.
Reviewed & verified by the MPN Base engineering desk against source catalog SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB on 2026-09-26. Read our editorial & correction policy.