32248-DF bearing: complete specifications & equivalents
The 32248-DF is a ISO 355 radial bearing sized 240 x 440 x 254 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 240 mm |
| Outer diameter D | 440 mm |
| Width B | 254 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 3300 kN |
| Basic static load rating C0 | 6550 kN |
| Fatigue load limit Pu | 550 kN |
| Reference speed (thermal) | 1000 rpm |
| Limiting speed (mechanical) | 1500 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 172000 g |
| Manufacturer designation | SKF 32248/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 | 9.449 in |
|---|---|
| Outer diameter D | 17.323 in |
| Width B | 10 in |
| ISO bore code | 48 |
| Radial section height (D−d)/2 | 100 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) | 29 of 35 |
| Bore above smallest matched-df-series size | 215 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 32248 | 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 32248-DF model number is decoded
Lubrication for the pair should be sized against the combined 254 mm width and 172000 g mass: two roller sets sweep twice the contact area of a single bearing of the same bore.32248-DF (SKF 32248/DF) is the face-to-face (X) matched pair matched-set choice for a 240 mm shaft: a pair of tapered roller bearings whose combined envelope is 440×254 mm, delivered ready to mount with controlled internal clearance.Numbering ties the set to its envelope: base 32248 fixes the 240 mm bore and 440 mm OD of each bearing, the /DF suffix fixes the arrangement and setting, and the catalogue 254 mm width is the combined pair dimension. 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 254 mm overall width of 32248-DF is the axial space the pair occupies. Catalogue mass 172000 g covers both bearings and the ground spacer of 32248-DF; keep the set complete — substituting one bearing or a non-ground spacer destroys the factory clearance. Assembly datum check: verify the 254 mm width against the drawing before clamping — the width is the assembled result and the quickest field check that the correct execution of 32248-DF is on the shaft. Mounting order matters for 32248-DF: seat the first bearing, fit the ground spacer, then the second bearing, and clamp axially as a unit — the 254 mm catalogue width is the assembled result and the gauge for correct assembly.
Typical equipment & failure modes
Common applications
- large industrial mixer shafts
- offshore winch and drawworks drums
- rolling-mill roll-neck bearings
- wind-turbine main shafts
Known failure patterns
- false brinelling on idle paired sets exposed to machine vibration
- roller large-end smearing against the cone rib after EP lubricant film failure
- cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity
- mounting score marks when the cone is cocked over the shaft keyway or a burr
- edge loading from shaft deflection or housing misalignment
Selection pitfalls — read before you substitute
- Setting is built into 32248-DF; the classic field error is re-adjusting a matched pair as if it were two loose single bearings, which destroys the /DF clearance class.
- Clamp the 32248-DF pair axially through the cones, never through the rollers; pressing force across the roller complement brinells the raceways of both bearings at once.
- Setting is built into 32248-DF; the classic field error is re-adjusting a matched pair as if it were two loose single bearings, which destroys the /DF clearance class.
- The 3300/6550 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 32248/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 32248-DF?
The SKF 32248/DF is a matched pair of single-row tapered roller bearings in face-to-face (X) matched pair arrangement with 240 mm bore, 440 mm outer diameter and 254 mm overall width (9.449 × 17.323 × 10 in). From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 3300 kN, C0 6550 kN, fatigue load limit Pu 550 kN, reference speed 1,000 r/min, limiting speed 1,500 r/min, mass about 172.00 kg.
What does the /DF suffix on 32248-DF mean?
The base 32248 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 32248-DF for one bearing or the pair?
They are for the complete matched pair: C 3300 kN dynamic and C0 6550 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 32248 table values.
Can 32248-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 240 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 240 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.