33017-DF bearing: complete specifications & equivalents
The 33017-DF is a ISO 355 radial bearing sized 85 x 130 x 72 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 85 mm |
| Outer diameter D | 130 mm |
| Width B | 72 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 382 kN |
| Basic static load rating C0 | 620 kN |
| Fatigue load limit Pu | 69.5 kN |
| Reference speed (thermal) | 3200 rpm |
| Limiting speed (mechanical) | 4800 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 3500 g |
| Manufacturer designation | SKF 33017/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 | 3.346 in |
|---|---|
| Outer diameter D | 5.118 in |
| Width B | 2.835 in |
| ISO bore code | 17 |
| Radial section height (D−d)/2 | 22.5 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) | 13 of 35 |
| Bore above smallest matched-df-series size | 60 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 33017 | 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 33017-DF model number is decoded
Material and manufacturing detail: the 3500 g catalogue mass reflects through-hardened bearing steel machined to the listed envelope; ring roundness and width tolerance keep the mounted-setting scatter inside the catalogue class. Thermal behaviour of the pair: heat generated in the 85 mm bore cones flows along the shaft and changes the setting; the /DF clearance class is chosen for the catalogue speed range 3,200–4,800 r/min, so re-select the clearance class if the application runs hotter. The rotating cones of 33017-DF take a k5 seat on the 85 mm shaft; the cups are a transition-to-loose fit so the pair can be clamped to its factory setting during assembly.33017-DF is a matched pair of single-row tapered roller bearings arranged face-to-face (X) matched pair, supplied by SKF in SKF catalogue PUB BU/P1 17000 as one factory-set unit: the two bearings, spacers and setting are matched together and must not be mixed with other sets.Reading the designation: 33017 is the ISO 355 single-row base bearing (85 mm bore), and the suffix /DF marks the matched-set execution — arrangement, spacer grinding and factory clearance class. The pair envelope is 85×130×72 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; 33017-DF therefore runs cooler where the shaft expands axially, at the price of lower moment stiffness than an O-arrangement of the same 85 mm bore. Catalogue mass 3500 g covers both bearings and the ground spacer of 33017-DF; keep the set complete — substituting one bearing or a non-ground spacer destroys the factory clearance.
Typical equipment & failure modes
Common applications
- paper-machine and printing rolls
- construction machinery drives
- marine deck machinery shafts
- construction machinery drives
Known failure patterns
- thermal preload runaway in an O-arrangement pair when inner-ring heat expands the setting
- axial overload spalling at the roller-rib contact beyond the single-row thrust rating
- cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity
- rib-roller contact scoring from loss of the EP additive film
- edge loading from shaft deflection or housing misalignment
Selection pitfalls — read before you substitute
- Spacer faces must stay parallel within the set's own tolerance; a tilted spacer in 33017-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 33017-DF concentrates reversing thrust on one bearing and shows up as one-sided raceway wear.
- A matched /DF set is ground as one system: never separate the two bearings of 33017-DF or swap the spacer — the factory clearance is lost the moment the set is broken.
- The 382/620 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 33017/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 33017-DF?
The SKF 33017/DF is a matched pair of single-row tapered roller bearings in face-to-face (X) matched pair arrangement with 85 mm bore, 130 mm outer diameter and 72 mm overall width (3.346 × 5.118 × 2.835 in). From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 382 kN, C0 620 kN, fatigue load limit Pu 69.5 kN, reference speed 3,200 r/min, limiting speed 4,800 r/min, mass about 3.50 kg.
What does the /DF suffix on 33017-DF mean?
The base 33017 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 33017-DF for one bearing or the pair?
They are for the complete matched pair: C 382 kN dynamic and C0 620 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 33017 table values.
Can 33017-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 85 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 85 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.