32009X-DF bearing: complete specifications & equivalents
The 32009X-DF is a ISO 355 radial bearing sized 45 x 75 x 40 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 45 mm |
| Outer diameter D | 75 mm |
| Width B | 40 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 123 kN |
| Basic static load rating C0 | 160 kN |
| Fatigue load limit Pu | 17.6 kN |
| Reference speed (thermal) | 5600 rpm |
| Limiting speed (mechanical) | 8500 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 710 g |
| Manufacturer designation | SKF 32009 X/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 | 1.772 in |
|---|---|
| Outer diameter D | 2.953 in |
| Width B | 1.575 in |
| ISO bore code | — |
| 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) | 5 of 35 |
| Bore above smallest matched-df-series size | 20 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 32009X | 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. |
| 32009X | 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 32009X-DF model number is decoded
The rotating cones of 32009X-DF take a k5 seat on the 45 mm shaft; the cups are a transition-to-loose fit so the pair can be clamped to its factory setting during assembly.In SKF catalogue PUB BU/P1 17000, 32009X-DF appears as SKF 32009 X/DF: a matched face-to-face (X) matched pair pair for a 45 mm shaft, rated as a set at C 123 kN and C0 160 kN.On the SKF nameplate, 32009X-DF reads as base 32009 X in a /DF matched execution — the suffix is part of the order number because a matched set is ground for a specific axial clearance and cannot be assembled from loose single bearings. Face-to-face matching puts the small rib ends outward, so the pressure cones cross inside the pair; 32009X-DF therefore runs cooler where the shaft expands axially, at the price of lower moment stiffness than an O-arrangement of the same 45 mm bore. With a pair mass of 710 g across the 45×75×40 mm envelope, the set replaces what would otherwise be two separate bearings plus spacer grinding work — the factory setting is the engineering value being purchased. Cross-section geometry: the 15.0 mm half-section ((75−45)/2) places the roller pitch diameter near 60 mm, and the 40 mm axial width sets the abutment depth — geometry that fixes the contact angle behaviour of 32009X-DF. Inspection shorthand: at overhaul, mark both bearings and the spacer of 32009X-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
- automotive and light-truck wheel hubs
- industrial gearbox shafts and reducers
- differential and pinion drives
- belt-driven fan and blower shafts
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
- 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
- Clamp the 32009X-DF pair axially through the cones, never through the rollers; pressing force across the roller complement brinells the raceways of both bearings at once.
- Clamp the 32009X-DF pair axially through the cones, never through the rollers; pressing force across the roller complement brinells the raceways of both bearings at once.
- Spacer faces must stay parallel within the set's own tolerance; a tilted spacer in 32009X-DF concentrates reversing thrust on one bearing and shows up as one-sided raceway wear.
- The 123/160 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 32009 X/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 32009X-DF?
The SKF 32009 X/DF is a matched pair of single-row tapered roller bearings in face-to-face (X) matched pair arrangement with 45 mm bore, 75 mm outer diameter and 40 mm overall width (1.772 × 2.953 × 1.575 in). From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 123 kN, C0 160 kN, fatigue load limit Pu 17.6 kN, reference speed 5,600 r/min, limiting speed 8,500 r/min, mass about 0.71 kg.
What does the /DF suffix on 32009X-DF mean?
The base 32009 X 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 32009X-DF for one bearing or the pair?
They are for the complete matched pair: C 123 kN dynamic and C0 160 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 32009 X table values.
Can 32009X-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 45 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 45 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.