33026 bearing: complete specifications & equivalents
The 33026 is a ISO 355 radial bearing sized 130 x 200 x 55 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 130 mm |
| Outer diameter D | 200 mm |
| Width B | 55 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 470 kN |
| Basic static load rating C0 | 680 kN |
| Fatigue load limit Pu | 69.5 kN |
| Reference speed (thermal) | 2400 rpm |
| Limiting speed (mechanical) | 3000 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 6150 g |
| Manufacturer designation | SKF 33026 |
| 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 | 5.118 in |
|---|---|
| Outer diameter D | 7.874 in |
| Width B | 2.165 in |
| ISO bore code | 26 |
| Radial section height (D−d)/2 | 35 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) | 15 of 16 |
| Bore above smallest 33000-series size | 80 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 33026 | 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 33026 model number is decoded
In SKF catalogue PUB BU/P1 17000, 33026 appears as SKF 33026: an open, single-row tapered roller bearing in the slim light section of the 33000 dimension series, supplied with a pressed-steel cage as standard.Numbering ties the bearing to its envelope: 33026 means tapered-roller type 3, slim light section series 30, 130 mm bore — which is why the 200×55 mm outline swaps dimensionally with other ISO 355 bearings of the same code. 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. Selection arithmetic: the C0/C ratio is about 1.45 (static 680 kN against dynamic 470 kN), typical of a tapered roller sized for axial capacity, and the 69.5 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. Specify pairs rather than single units wherever thrust reverses: the tapered contact of 33026 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
- heavy-duty rolling-mill gearboxes
- large crusher and mineral-processing drives
- wind-turbine main shafts
- marine propulsion gearboxes
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
- thermal preload runaway in an O-arrangement pair when inner-ring heat expands the setting
- uneven load sharing in a pair when spacer faces are not parallel to the bore
- cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity
- electrical pitting on VFD-driven shafts without grounding protection
Selection pitfalls — read before you substitute
- At 130 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 130 mm bore (200×55 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 30226 of the same bore — confirm the L10 margin before downsizing into it.
- Setting is a design value, not an assembly feel: excessive preload in the 33026 pair raises operating temperature and can trigger thermal runaway, while too little lets the rollers skid and smear the raceway under light load.
- At the 470 kN rating of 33026, preload class changes stiffness by tens of percent but also heat generation; select light preload for the 3,000 r/min speed end and heavier preload only where moment stiffness dominates.
- The 33026 shares its ISO 355 envelope with other tapered bearings of the same code but is not a drop-in replacement for a ball bearing: it cannot run effectively under pure radial load without a minimum axial load, and a deep-groove bearing cannot replace its combined-load duty.
- The 470/680 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 33026 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 33026 designation when purchasing and match the execution to the mounting arrangement.
Frequently asked questions
What are the dimensions and catalogue data of 33026?
The SKF 33026 is a single-row tapered roller bearing with 130 mm bore, 200 mm outer diameter and 55 mm width (5.118 × 7.874 × 2.165 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 470 kN, C0 680 kN, fatigue load limit Pu 69.5 kN, reference speed 2,400 r/min, limiting speed 3,000 r/min, mass about 6150 g. It is an open, separable bearing with a pressed-steel cage.
How does the 33026 bore code work?
The last two digits of 33026 are bore code 26, so 26 × 5 = 130 mm bore. The 200 mm OD and 55 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code.
What do the 33026 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 33026 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 33026 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 33026 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.