W6204 bearing: complete specifications & equivalents
The W6204 is a ISO 15 radial bearing sized 20 x 47 x 14 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 20 mm |
| Outer diameter D | 47 mm |
| Width B | 14 mm |
| Material | SS440C |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 10.8 kN |
| Basic static load rating C0 | 6.55 kN |
| Fatigue load limit Pu | 0.28 kN |
| Reference speed (thermal) | 34000 rpm |
| Limiting speed (mechanical) | 22000 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 100 g |
| Manufacturer designation | W 6204 |
| Standard | ISO 15 |
| Catalog version | SKF PUB BU/P1 17000/1 EN (Oct 2018) |
| Last verified | 2026-09-27 |
Source: catalog reference (SKF PUB BU/P1 17000/1 EN (Oct 2018)) · extracted 2026-09-27
Parameters extracted from the official SKF Rolling Bearings catalogue (SKF PUB BU/P1 17000/1 EN (Oct 2018)); 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 & 6200-series range
| Bore d | 0.787 in |
|---|---|
| Outer diameter D | 1.85 in |
| Width B | 0.551 in |
| ISO bore code | 04 |
| Radial section height (D−d)/2 | 13.5 mm |
| Smallest bore in 6200-series | 3 mm |
| Largest outer diameter in 6200-series | 540 mm |
| Width range across 6200-series | 2.5–85 mm |
| Bore position in 6200-series (smallest first) | 11 of 45 |
| Bore above smallest 6200-series size | 17 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| W6204-2RS | SKF | full Dimensions and internal design equivalent — standard interchange. | Same 20×47×14 mm envelope and equivalent catalogue ratings; W 6204-2RS1 is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs. |
| W6204-ZZ | SKF | full Dimensions and internal design equivalent — standard interchange. | Same 20×47×14 mm envelope and equivalent catalogue ratings; W 6204-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs. |
| 6204 | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | SKF SKF 6204 shares the 20×47×14 mm envelope but carries different catalogue ratings (10.8/6.55 kN vs 13.5/6.55 kN) — the stainless execution is not a load-rating equivalent. |
| 6204-ZZ | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | SKF SKF 6204-2Z shares the 20×47×14 mm envelope but carries different catalogue ratings (10.8/6.55 kN vs 13.5/6.55 kN) — the stainless execution is not a load-rating equivalent. |
| 6204-2RS | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | SKF SKF 6204-2RSH shares the 20×47×14 mm envelope but carries different catalogue ratings (10.8/6.55 kN vs 13.5/6.55 kN) — the stainless execution is not a load-rating equivalent. |
| 6204-RSR | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | SKF SKF 6204-2RSL shares the 20×47×14 mm envelope but carries different catalogue ratings (10.8/6.55 kN vs 13.5/6.55 kN) — the stainless execution is not a load-rating equivalent. |
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 W6204 model number is decoded
The W prefix denotes SKF stainless steel deep-groove bearings (X108CrMo17 / AISI 440C class rings). In the 6200-series, the last two digits encode the bore: 6204 carries code 04 = 20 mm (code × 5). Envelope 20×47×14 mm (0.787×1.85×0.551 in), C 10.8 kN, C0 6.55 kN, Pu 0.28 kN; limiting speed 22000 r/min and mass 100 g. The open W 6204 carries no shields or seals and relies on application lubrication and external sealing. Stainless is chosen for corrosion and washdown duty, not for extra load — the same-envelope chrome-steel bearing rates higher.
Typical equipment & failure modes
Common applications
- chemical and marine atmospheres
- medical and laboratory devices
- small pumps handling corrosive media
- bicycle and outdoor equipment
Known failure patterns
- surface staining and pitting when even the stainless steel is left unlubricated in salty or acidic duty
- seal and grease failure before the rings corrode in sustained washdown service
- contamination wear when the open arrangement is used without external seals
- lubricant starvation where no regreasing interval is maintained
Selection pitfalls — read before you substitute
- Stainless bearings carry lower load ratings than chrome steel of the same envelope: W6204 is quoted at C 10.8 kN versus the 14 mm-wide 52100 version — do not swap on dimensions alone.
- Food, pharmaceutical and washdown positions need food-grade grease (e.g. NSF H1 registered) inside W6204; standard fill is industrial grease unless specified otherwise.
- Corrosion resistance depends on clean, undamaged surfaces: never weld near W6204 or scratch the raceways during mounting, since the damaged spot starts corrosion.
- Temperatures above roughly 300 °C temper the stainless races; even standard greases fail far earlier — keep W6204 inside the quoted grease temperature range.
- Do not preload W6204 to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.
- Assign interference to the rotating ring: on a conventional shaft-mounted 20 mm position the inner ring rotates, so use a k5/m6 shaft seat with an H7 housing — reverse the logic if the outer ring rotates.
Frequently asked questions
What are the dimensions of the stainless W6204?
SKF W 6204 measures 20×47×14 mm (0.787×1.85×0.551 in), about 100 g, C 10.8 kN.
What does the W in W 6204 mean?
W is the SKF prefix for stainless steel deep-groove bearings (rings in X108CrMo17 / AISI 440C class); the rest of the designation follows the normal series and bore rules.
Where is W6204 typically used?
Food and packaging machines, pharmaceutical equipment, washdown conveyors, chemical and marine-atmosphere drives and appliances exposed to moisture.
What grease is supplied in W6204?
The open bearing may ship with a rust-preventive film only; specify a food-grade grease for HACCP areas and plan relubrication.
Reviewed & verified by the MPN Base engineering desk against source catalog SKF PUB BU/P1 17000/1 EN (Oct 2018) on 2026-09-27. Read our editorial & correction policy.