33015-DF bearing: complete specifications & equivalents
The 33015-DF is a ISO 355 radial bearing sized 75 x 115 x 62 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 75 mm |
| Outer diameter D | 115 mm |
| Width B | 62 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 286 kN |
| Basic static load rating C0 | 455 kN |
| Fatigue load limit Pu | 52 kN |
| Reference speed (thermal) | 3600 rpm |
| Limiting speed (mechanical) | 5300 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 2400 g |
| Manufacturer designation | SKF 33015/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 | 2.953 in |
|---|---|
| Outer diameter D | 4.528 in |
| Width B | 2.441 in |
| ISO bore code | 15 |
| 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) | 11 of 35 |
| Bore above smallest matched-df-series size | 50 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 33015 | 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 33015-DF model number is decoded
Clamp the assembled pair axially through the cones — never through the rollers — and verify the 62 mm overall width against the catalogue value before final torquing of the shaft nut.For a 75 mm shaft carrying reversing axial load, SKF lists 33015-DF under catalogue execution SKF 33015/DF: a factory-matched face-to-face (X) matched pair tapered-roller pair, set and measured as one unit.Reading the designation: 33015 is the ISO 355 single-row base bearing (75 mm bore), and the suffix /DF marks the matched-set execution — arrangement, spacer grinding and factory clearance class. The pair envelope is 75×115×62 mm; the width covers both bearings of the set. Face-to-face matching puts the small rib ends outward, so the pressure cones cross inside the pair; 33015-DF therefore runs cooler where the shaft expands axially, at the price of lower moment stiffness than an O-arrangement of the same 75 mm bore. The C0/C balance of the pair is about 1.59; combined with the 52 kN fatigue limit this frames a set sized for reversing combined load on a 75 mm shaft rather than for pure radial duty. Cross-section geometry: the 20.0 mm half-section ((115−75)/2) places the roller pitch diameter near 95 mm, and the 62 mm axial width sets the abutment depth — geometry that fixes the contact angle behaviour of 33015-DF. Inspection shorthand: at overhaul, mark both bearings and the spacer of 33015-DF before disassembly — the set is a matched system, and re-assembling with one component reversed changes the factory setting.
Typical equipment & failure modes
Common applications
- large process pump and compressor shafts
- rolling-mill auxiliary drives
- crane sheave and hoist gearboxes
- marine deck machinery shafts
Known failure patterns
- thermal preload runaway in an O-arrangement pair when inner-ring heat expands the setting
- 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
- fretting corrosion on a loose rotating shaft seat
- rib-roller contact scoring from loss of the EP additive film
Selection pitfalls — read before you substitute
- Setting is built into 33015-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.
- Setting is built into 33015-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.
- A matched /DF set is ground as one system: never separate the two bearings of 33015-DF or swap the spacer — the factory clearance is lost the moment the set is broken.
- The 286/455 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 33015/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 33015-DF?
The SKF 33015/DF is a matched pair of single-row tapered roller bearings in face-to-face (X) matched pair arrangement with 75 mm bore, 115 mm outer diameter and 62 mm overall width (2.953 × 4.528 × 2.441 in). From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 286 kN, C0 455 kN, fatigue load limit Pu 52 kN, reference speed 3,600 r/min, limiting speed 5,300 r/min, mass about 2.40 kg.
What does the /DF suffix on 33015-DF mean?
The base 33015 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 33015-DF for one bearing or the pair?
They are for the complete matched pair: C 286 kN dynamic and C0 455 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 33015 table values.
Can 33015-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 75 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 75 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.