32004 bearing: complete specifications & equivalents
The 32004 is a ISO 355 radial bearing sized 20 x 42 x 15 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | FAG |
| Bore diameter d | 20 mm |
| Outer diameter D | 42 mm |
| Width B | 15 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 28.5 kN |
| Basic static load rating C0 | 29 kN |
| Fatigue load limit Pu | 4.05 kN |
| Reference speed (thermal) | 10700 rpm |
| Limiting speed (mechanical) | 21900 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 101 g |
| Manufacturer designation | 32004-X-XL |
| Standard | ISO 355 |
| Catalog version | Schaeffler HR1 (2022 ed.), Tapered roller bearings DIN/ISO 355 |
| Last verified | 2026-09-26 |
Source: catalog reference (Schaeffler HR1 (2022 ed.), Tapered roller bearings DIN/ISO 355) · extracted 2026-09-26
Parameters extracted from the official FAG Rolling Bearings catalogue (Schaeffler HR1 (2022 ed.), Tapered roller bearings DIN/ISO 355); FAG® is a trademark of Schaeffler Technologies AG & Co. KG, used here for identification only — mpnbase is not an authorized FAG/Schaeffler distributor. Boundary dimensions are ISO 15 interchangeable; current production values may differ, verify at schaeffler.com.
Dimensions in inches & 32000-series range
| Bore d | 0.787 in |
|---|---|
| Outer diameter D | 1.654 in |
| Width B | 0.591 in |
| ISO bore code | 04 |
| Radial section height (D−d)/2 | 11 mm |
| Smallest bore in 32000-series | 20 mm |
| Largest outer diameter in 32000-series | 650 mm |
| Width range across 32000-series | 15–130 mm |
| Bore position in 32000-series (smallest first) | 1 of 43 |
| Bore above smallest 32000-series size | 0 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 32004 | ISO 15 | full Dimensions and internal design equivalent — standard interchange. | ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier. |
| 32004-SKF | SKF | full Dimensions and internal design equivalent — standard interchange. | Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier. |
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 32004 model number is decoded
32004-X-XL belongs to the FAG single-row tapered roller range — the 20 mm bore entry in the 32000 series, dimensioned 42 mm OD and 15 mm wide to the ISO 355 boundary plan.On the FAG nameplate, 32004 follows the ISO 355 convention: 3 for the tapered-roller type, 2 for the low-friction section, final digits 04 for the 20 mm bore. In Schaeffler notation 32004-X-XL is the basic X-life execution; B-suffix variants have a steeper contact angle and are not interchangeable with the base bearing. Speed planning uses two different ceilings: 10,700 r/min thermal reference and 21,900 r/min mechanical limiting speed. Specify pairs rather than single units wherever thrust reverses: the tapered contact of 32004 generates an induced axial load under radial force, and an unpaired bearing on a reversing shaft will run slack and fret its seat.
Typical equipment & failure modes
Common applications
- light-duty gearbox input/output shafts
- electric-motor pinion shafts
- steering knuckles and small differentials
- agricultural implement hubs
Known failure patterns
- cup or cone misalignment when the separable rings are not seated square during mounting
- loose cup rotation in the housing when the specified press fit is not achieved
- roller large-end smearing against the cone rib after EP lubricant film failure
- false brinelling on idle paired sets exposed to machine vibration
- pressed-steel cage wear or fracture after prolonged running above the limiting speed
- hard-particle indentation of the tapered raceway in unfiltered oil
Selection pitfalls — read before you substitute
- At a 20 mm bore the thin cone and cup are easily distorted by an over-tight shaft nut; check seat runout (target Ra ≤ 0.8 µm) and torque the locknut progressively — a pinched 32004 shows up as gearbox vibration long before it fails.
- The 320 series at 20 mm bore (42×15 mm) is the low-friction, higher-speed section; it carries less thrust than a 30204 of the same bore, so verify the axial load share before swapping.
- Do not mix brands or executions inside one 32004 pair — matched sets are ground for a specific setting, and pairing a FAG basic unit with a different suffix variant will not share the setting evenly.
- The tapered contact angle creates an induced axial load under pure radial force; include it in the 32004 rating calculation (and account for it in both bearings of a pair) or the unloaded bearing skids its rollers.
- Shaft and housing fillets must clear the bearing chamfer so the 15 mm-wide cup seats square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.
- The 28.5/29 kN ratings are Schaeffler HR1 values for the X-life execution; the -XL suffix denotes the premium grade and is part of the order designation, so quote it in full when purchasing.
- Schaeffler lists 32004 in the X-life basic execution; variant executions with -B or other suffixes are separate order numbers and are not interchangeable with the basic X-life bearing.
Frequently asked questions
What are the dimensions and catalogue data of 32004?
The 32004-X-XL is a single-row tapered roller bearing with 20 mm bore, 42 mm outer diameter and 15 mm width (0.787 × 1.654 × 0.591 in) per ISO 355. From Schaeffler HR1 (2022 edition): basic dynamic load rating C 28.5 kN, C0 29 kN, fatigue load limit Pu 4.05 kN, reference speed 10,700 r/min, limiting speed 21,900 r/min, mass about 101 g. It is an open, separable bearing with a pressed-steel cage.
How does the 32004 bore code work?
The last two digits of 32004 are bore code 04, so 04 × 5 = 20 mm bore. The 42 mm OD and 15 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code.
What do the 32004 series and X-life execution designations mean?
The leading 3 marks a single-row tapered roller bearing; the second digit 2 is the ISO 355 series (low-friction section). The FAG -XL suffix denotes X-life premium grade; the ISO 355 series code is interchangeable with other brands. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution.
Can a single 32004 take axial load in both directions?
No — one single-row tapered roller bearing 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 (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared.
How does 32004 compare with a ball bearing of the same bore?
A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 32004 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting.
Reviewed & verified by the MPN Base engineering desk against source catalog Schaeffler HR1 (2022 ed.), Tapered roller bearings DIN/ISO 355 on 2026-09-26. Read our editorial & correction policy.