33024-DF bearing: complete specifications & equivalents
The 33024-DF is a ISO 355 radial bearing sized 120 x 180 x 96 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 120 mm |
| Outer diameter D | 180 mm |
| Width B | 96 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 611 kN |
| Basic static load rating C0 | 1080 kN |
| Fatigue load limit Pu | 112 kN |
| Reference speed (thermal) | 2200 rpm |
| Limiting speed (mechanical) | 3400 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 8600 g |
| Manufacturer designation | SKF 33024/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 | 4.724 in |
|---|---|
| Outer diameter D | 7.087 in |
| Width B | 3.78 in |
| ISO bore code | 24 |
| Radial section height (D−d)/2 | 30 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) | 19 of 35 |
| Bore above smallest matched-df-series size | 95 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 33024 | 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 33024-DF model number is decoded
SKF 33024/DF belongs to the SKF matched tapered-roller range — the 120 mm bore entry in face-to-face (X) matched pair arrangement, dimensioned 180 mm OD and 96 mm overall width for the pair.The code breaks down as base bearing 33024 plus matched-set suffix /DF: two bearings of the 120 mm bore size, paired face-to-face (X) matched pair, with the 96 mm overall width spanning the whole arrangement. In the face-to-face (X) arrangement the load lines of the two bearings converge toward the shaft axis: the set tolerates shaft deflection and thermal growth better than a back-to-back pair, but is less stiff against overturning moments. The 96 mm overall width of 33024-DF is the axial space the pair occupies. Catalogue mass 8600 g covers both bearings and the ground spacer of 33024-DF; keep the set complete — substituting one bearing or a non-ground spacer destroys the factory clearance. Journal and housing interface: the 120 mm bore takes a m6 shaft seat and the 180 mm outside diameter pairs with an H7 housing bore; the 96 mm width defines shoulder depth and the 8600 g mass is the dead load in thermal-growth calculations. Load sharing in 33024-DF depends on spacer face parallelism; a cocked spacer concentrates the reversing thrust on one bearing of the pair and shows up as asymmetric raceway wear at overhaul. Lubrication for the pair should be sized against the combined 96 mm width and 8600 g mass: two roller sets sweep twice the contact area of a single bearing of the same bore.
Typical equipment & failure modes
Common applications
- large industrial mixer shafts
- offshore winch and drawworks drums
- rolling-mill roll-neck bearings
- large industrial mixer shafts
Known failure patterns
- false brinelling on idle paired sets exposed to machine vibration
- thermal preload runaway in an O-arrangement pair when inner-ring heat expands the setting
- 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
- A matched /DF set is ground as one system: never separate the two bearings of 33024-DF or swap the spacer — the factory clearance is lost the moment the set is broken.
- Clamp the 33024-DF pair axially through the cones, never through the rollers; pressing force across the roller complement brinells the raceways of both bearings at once.
- A matched /DF set is ground as one system: never separate the two bearings of 33024-DF or swap the spacer — the factory clearance is lost the moment the set is broken.
- The 611/1080 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 33024/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 33024-DF?
The SKF 33024/DF is a matched pair of single-row tapered roller bearings in face-to-face (X) matched pair arrangement with 120 mm bore, 180 mm outer diameter and 96 mm overall width (4.724 × 7.087 × 3.78 in). From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 611 kN, C0 1080 kN, fatigue load limit Pu 112 kN, reference speed 2,200 r/min, limiting speed 3,400 r/min, mass about 8.60 kg.
What does the /DF suffix on 33024-DF mean?
The base 33024 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 33024-DF for one bearing or the pair?
They are for the complete matched pair: C 611 kN dynamic and C0 1080 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 33024 table values.
Can 33024-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 (m6 on a rotating 120 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 120 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.