33010-DF bearing: complete specifications & equivalents
The 33010-DF is a ISO 355 radial bearing sized 50 x 80 x 48 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 | 80 mm |
| Width B | 48 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 145 kN |
| Basic static load rating C0 | 204 kN |
| Fatigue load limit Pu | 22.8 kN |
| Reference speed (thermal) | 5300 rpm |
| Limiting speed (mechanical) | 8000 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 920 g |
| Manufacturer designation | SKF 33010/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 | 3.15 in |
| Width B | 1.89 in |
| ISO bore code | 10 |
| Radial section height (D−d)/2 | 15 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 |
|---|---|---|---|
| 33010 | 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. |
| 33010-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 33010-DF model number is decoded
SKF 33010/DF belongs to the SKF matched tapered-roller range — the 50 mm bore entry in face-to-face (X) matched pair arrangement, dimensioned 80 mm OD and 48 mm overall width for the pair.The code breaks down as base bearing 33010 plus matched-set suffix /DF: two bearings of the 50 mm bore size, paired face-to-face (X) matched pair, with the 48 mm overall width spanning the whole arrangement. Face-to-face matching puts the small rib ends outward, so the pressure cones cross inside the pair; 33010-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. Dividing the pair C 145 kN by the 50 mm bore gives 2.90 kN per millimetre of journal for the complete arrangement — a density metric that compares matched sets across the face-to-face (X) matched pair family. Dimensional interchange map: within its boundary plan the 50×80×48 mm envelope of 33010-DF is fixed, so shoulder, spacer and seal drawings can be dimensioned straight from the catalogue table. Thermal behaviour of the pair: heat generated in the 50 mm bore cones flows along the shaft and changes the setting; the /DF clearance class is chosen for the catalogue speed range 5,300–8,000 r/min, so re-select the clearance class if the application runs hotter. Lubrication for the pair should be sized against the combined 48 mm width and 920 g mass: two roller sets sweep twice the contact area of a single bearing of the same bore.
Typical equipment & failure modes
Common applications
- belt-driven fan and blower shafts
- axle-boxes in material-handling equipment
- automotive and light-truck wheel hubs
- belt-driven fan and blower shafts
Known failure patterns
- axial overload spalling at the roller-rib contact beyond the single-row thrust rating
- 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
- hard-particle indentation of the tapered raceway in unfiltered oil
- grease degradation after long shelf storage without rotation or re-greasing
Selection pitfalls — read before you substitute
- O and X arrangements are not interchangeable by turning the set around: 33010-DF in face-to-face (X) matched pair arrangement has its load-line geometry fixed — specify the arrangement from the shaft thermal and stiffness analysis.
- Clamp the 33010-DF pair axially through the cones, never through the rollers; pressing force across the roller complement brinells the raceways of both bearings at once.
- Replace 33010-DF as a complete set: pairing a new bearing with a worn partner leaves the clearance undefined even when the designation matches.
- The 145/204 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 33010/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 33010-DF?
The SKF 33010/DF is a matched pair of single-row tapered roller bearings in face-to-face (X) matched pair arrangement with 50 mm bore, 80 mm outer diameter and 48 mm overall width (1.969 × 3.15 × 1.89 in). From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 145 kN, C0 204 kN, fatigue load limit Pu 22.8 kN, reference speed 5,300 r/min, limiting speed 8,000 r/min, mass about 0.92 kg.
What does the /DF suffix on 33010-DF mean?
The base 33010 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 33010-DF for one bearing or the pair?
They are for the complete matched pair: C 145 kN dynamic and C0 204 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 33010 table values.
Can 33010-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.