33210-DF bearing: complete specifications & equivalents
The 33210-DF is a ISO 355 radial bearing sized 50 x 90 x 64 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 50 mm |
| Outer diameter D | 90 mm |
| Width B | 64 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 243 kN |
| Basic static load rating C0 | 320 kN |
| Fatigue load limit Pu | 36.5 kN |
| Reference speed (thermal) | 4800 rpm |
| Limiting speed (mechanical) | 7000 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 1750 g |
| Manufacturer designation | SKF 33210/DF |
| Standard | ISO 355 |
| Catalog version | SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.3-8.8 TRB variants |
| Last verified | 2026-09-29 |
Source: catalog reference (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.3-8.8 TRB variants) · extracted 2026-09-29
Parameters extracted from the official SKF Rolling Bearings catalogue (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.3-8.8 TRB variants); 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 & matched-df-series range
| Bore d | 1.969 in |
|---|---|
| Outer diameter D | 3.543 in |
| Width B | 2.52 in |
| ISO bore code | 10 |
| Radial section height (D−d)/2 | 20 mm |
| Smallest bore in matched-df-series | 25 mm |
| Largest outer diameter in matched-df-series | 540 mm |
| Width range across matched-df-series | 34.5–280 mm |
| Bore position in matched-df-series (smallest first) | 6 of 35 |
| Bore above smallest matched-df-series size | 25 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 33210 | 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. |
| 33210-NTN | NTN | verify Commonly quoted cross reference; confirm against the target catalog before ordering. | Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue. |
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 33210-DF model number is decoded
Face-to-face matching puts the small rib ends outward, so the pressure cones cross inside the pair; 33210-DF therefore runs cooler where the shaft expands axially, at the price of lower moment stiffness than an O-arrangement of the same 50 mm bore. The C0/C balance of the pair is about 1.32; combined with the 36.5 kN fatigue limit this frames a set sized for reversing combined load on a 50 mm shaft rather than for pure radial duty. Operating context for the 50 mm bore: a shaft of this diameter typically runs in the medium-bore band of industrial duty, and the 90 mm OD places the housing shoulder near 98 mm outer abutment. Inspection shorthand: at overhaul, mark both bearings and the spacer of 33210-DF before disassembly — the set is a matched system, and re-assembling with one component reversed changes the factory setting. A matched /DF set needs no setting adjustment at mounting: the clearance is built in; the assembler's job is clean seats, correct fits (k5 on a 50 mm rotating shaft) and square abutments.SKF 33210/DF belongs to the SKF matched tapered-roller range — the 50 mm bore entry in face-to-face (X) matched pair arrangement, dimensioned 90 mm OD and 64 mm overall width for the pair.The code breaks down as base bearing 33210 plus matched-set suffix /DF: two bearings of the 50 mm bore size, paired face-to-face (X) matched pair, with the 64 mm overall width spanning the whole arrangement.
Typical equipment & failure modes
Common applications
- belt-driven fan and blower shafts
- axle-boxes in material-handling equipment
- automotive and light-truck wheel hubs
- differential and pinion drives
Known failure patterns
- false brinelling on idle paired sets exposed to machine vibration
- preload loss as the mounted pair relaxes, letting rollers skid and smear the raceways
- cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity
- brinelling from pressing the cone or cup home through the rollers
- grease degradation after long shelf storage without rotation or re-greasing
Selection pitfalls — read before you substitute
- Spacer faces must stay parallel within the set's own tolerance; a tilted spacer in 33210-DF concentrates reversing thrust on one bearing and shows up as one-sided raceway wear.
- Spacer faces must stay parallel within the set's own tolerance; a tilted spacer in 33210-DF concentrates reversing thrust on one bearing and shows up as one-sided raceway wear.
- Clamp the 33210-DF pair axially through the cones, never through the rollers; pressing force across the roller complement brinells the raceways of both bearings at once.
- The 243/320 kN ratings are SKF catalogue 17000 values for this 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.
- Quote the full SKF 33210/DF designation when purchasing — base-number-only orders are ambiguous across executions and variants.
Frequently asked questions
What are the dimensions and catalogue data of 33210-DF?
The SKF 33210/DF is a matched pair of single-row tapered roller bearings in face-to-face (X) matched pair arrangement with 50 mm bore, 90 mm outer diameter and 64 mm overall width (1.969 × 3.543 × 2.52 in). From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 243 kN, C0 320 kN, fatigue load limit Pu 36.5 kN, reference speed 4,800 r/min, limiting speed 7,000 r/min, mass about 1.75 kg.
What does the /DF suffix on 33210-DF mean?
The base 33210 is the ISO 355 single-row bearing; the /DF suffix marks the matched-set execution — the arrangement (face-to-face (X)), the ground spacer and the factory-set axial clearance class. A matched set cannot be assembled from loose single bearings; quote the full designation when ordering.
Are the C and C0 ratings of 33210-DF for one bearing or the pair?
They are for the complete matched pair: C 243 kN dynamic and C0 320 kN static already include load sharing between the two bearings. Do not halve them for single-bearing checks, and do not compare them directly with the single-row 33210 table values.
Can 33210-DF be adjusted like two loose tapered bearings?
No — the axial clearance is set at the factory by selective spacer grinding. Mounting work is limited to clean seats, correct fits (k5 on a rotating 50 mm shaft) and axial clamping through the cones; re-setting in the field destroys the matched clearance class.
When should a face-to-face (X) matched set be chosen?
Choose the face-to-face (X) set where the shaft grows thermally or alignment is imperfect — the converging load lines tolerate deflection. It is the default choice for wheel hubs and general gearbox shafts at the 50 mm bore.
Reviewed & verified by the MPN Base engineering desk against source catalog SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.3-8.8 TRB variants on 2026-09-29. Read our editorial & correction policy.