32008XR bearing: complete specifications & equivalents
The 32008XR is a ISO 355 radial bearing sized 40 x 68 x 19 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 40 mm |
| Outer diameter D | 68 mm |
| Width B | 19 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 64.7 kN |
| Basic static load rating C0 | 71 kN |
| Fatigue load limit Pu | 7.65 kN |
| Reference speed (thermal) | 7500 rpm |
| Limiting speed (mechanical) | 9500 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 290 g |
| Manufacturer designation | SKF 32008 XR |
| 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 & flanged-series range
| Bore d | 1.575 in |
|---|---|
| Outer diameter D | 2.677 in |
| Width B | 0.748 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 14 mm |
| Smallest bore in flanged-series | 35 mm |
| Largest outer diameter in flanged-series | 140 mm |
| Width range across flanged-series | 19–45.5 mm |
| Bore position in flanged-series (smallest first) | 2 of 5 |
| Bore above smallest flanged-series size | 5 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 32008XR | 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 32008XR model number is decoded
SKF 32008 XR belongs to the SKF flanged tapered-roller range — the 40 mm bore entry dimensioned 68×19 mm, intended for housings where one side has no room for a turned abutment shoulder.The code SKF 32008 XR breaks down as the ISO 355 base bearing 32008 plus the flange suffix: same 40 mm bore, 68 mm OD and 19 mm width as the standard execution, with the cup extended into a locating flange. Substitution caution: a plain 32008 bearing cannot replace 32008XR where the housing has no shoulder on the flange side — the plain cup would lack axial location even though the 40×68×19 mm boundary matches. Selection arithmetic: the C0/C ratio is about 1.10 (static 71 kN against dynamic 64.7 kN), and the 7.65 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. Operating context for the 40 mm bore: a shaft of this diameter typically runs in the medium-bore band of industrial duty, and the 68 mm OD places the housing shoulder near 76 mm outer abutment. Fit selection follows the rotating ring: a rotating cone on the 40 mm shaft takes a k5 seat; the flanged cup is clamped through its flange and does not need a tight housing fit on the 68 mm OD.
Typical equipment & failure modes
Common applications
- pump and compressor shafts
- machine-tool spindles
- belt-driven fan and blower shafts
- machine-tool spindles
Known failure patterns
- thermal preload runaway in an O-arrangement pair when inner-ring heat expands the setting
- uneven load sharing in a pair when spacer faces are not parallel to the bore
- cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity
- rolling-contact fatigue spalling after the rated L10 life is exceeded
- hard-particle indentation of the tapered raceway in unfiltered oil
Selection pitfalls — read before you substitute
- Check housing face runout where the flange seats: a face out of square cocks the 19 mm-wide cup and concentrates load on one rib — the usual root cause of early flanged-bearing noise.
- A plain 32008 bearing is not a spare for 32008XR where the flange provides the axial register: same envelope, different location concept — verify the housing design before substituting.
- A plain 32008 bearing is not a spare for 32008XR where the flange provides the axial register: same envelope, different location concept — verify the housing design before substituting.
- The 64.7/71 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 32008 XR designation when purchasing — base-number-only orders are ambiguous across executions and variants.
Frequently asked questions
What are the dimensions and catalogue data of 32008XR?
The SKF 32008 XR is a single-row tapered roller bearing with a flanged outer ring with 40 mm bore, 68 mm outer diameter and 19 mm overall width (1.575 × 2.677 × 0.748 in). From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 64.7 kN, C0 71 kN, fatigue load limit Pu 7.65 kN, reference speed 7,500 r/min, limiting speed 9,500 r/min, mass about 0.29 kg.
What does the flanged outer ring on 32008XR do?
The cup of 32008XR carries an integral flange that locates the bearing axially against the housing face, so the housing needs no machined abutment shoulder on the flange side. It simplifies through-bored or cover-mounted housings; the running clearance is still set by cone-versus-cup position at mounting, exactly as for the plain 32008 bearing.
Is 32008XR interchangeable with the plain 32008 bearing?
The boundary dimensions 40×68×19 mm match the ISO 355 plan of the base bearing, but the flanged cup is a different order number. It is interchangeable only where the housing provides axial location by other means; where the flange is the locating feature, a plain cup cannot substitute.
Can a single 32008XR take axial load in both directions?
No — like any single-row tapered roller bearing it reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair (O or X arrangement) for reversing thrust.
What shaft and housing fits suit 32008XR?
For a rotating cone on the 40 mm shaft, use a k5 seat; the flanged cup is retained through the flange, so the 68 mm OD seat can be a loose-to-transition fit. Keep housing face runout square so the flange seats without tilting the cup.
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.