62304-2RS bearing: complete specifications & equivalents
The 62304-2RS is a ISO 15 radial bearing sized 20 x 52 x 21 mm (bore x OD x width) with 2RS sealing. Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 20 mm |
| Outer diameter D | 52 mm |
| Width B | 21 mm |
| Material | GCr15 |
| Seal / shield | 2RS |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 15.9 kN |
| Basic static load rating C0 | 7.8 kN |
| Fatigue load limit Pu | 0.335 kN |
| Limiting speed (mechanical) | 9500 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 210 g |
| Manufacturer designation | 62304-2RS1 |
| 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 & 62300-series range
| Bore d | 0.787 in |
|---|---|
| Outer diameter D | 2.047 in |
| Width B | 0.827 in |
| ISO bore code | 04 |
| Radial section height (D−d)/2 | 16 mm |
| Smallest bore in 62300-series | 10 mm |
| Largest outer diameter in 62300-series | 150 mm |
| Width range across 62300-series | 17–51 mm |
| Bore position in 62300-series (smallest first) | 5 of 15 |
| Bore above smallest 62300-series size | 10 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 4304-ATN9 | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 20×52×21 mm envelope as SKF 4304 ATN9, but catalogue C/C0 differ (15.9/7.8 kN vs 23.4/16 kN) — envelope match only after a load check. |
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 62304-2RS model number is decoded
The 62300-series is the wide-section counterpart of the standard deep-groove family (extra width code built into the designation); the last two digits encode the bore: 62304 carries code 04 = 20 mm (code × 5). The envelope is 20×52×21 mm (0.787×2.047×0.827 in) with a 16.0 mm radial section height, C 15.9 kN, C0 7.8 kN and Pu 0.335 kN. SKF catalogues the sealed execution as 62304-2RS1: two contact elastomer lips (2RS1/2RSH spelling) over a lifetime grease fill; the lips add drag, and no reference (thermal) speed is published. Limiting speed 9500 r/min, catalogue mass 210 g.
Typical equipment & failure modes
Common applications
- textile machines
- electric motors
- centrifugal pumps
- small gearboxes
Known failure patterns
- contact-seal lip hardening and pre-grease loss after long high-temperature service
- grease-life expiry inside the sealed-for-life cavity, which has no relubrication path
- fretting corrosion on a creeping shaft or housing seat
- cage damage from running beyond the limiting speed
Selection pitfalls — read before you substitute
- Catalogue ratings for 62304-2RS (C 15.9 kN, C0 7.8 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.
- 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.
- Contact seals make 62304-2RS slower than the open 62304 (limiting 9500 r/min) and forbid solvent washing, which destroys the lifetime grease.
- Do not pry the caps off 62304-2RS to repack it; shield/seal damage leaves a gap that throws grease and admits dirt.
- Deep-groove geometry tolerates only minutes of misalignment; if the 52 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming 62304-2RS.
- Do not preload 62304-2RS to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.
Frequently asked questions
What are the dimensions of 62304-2RS?
The SKF 62304-2RS1 measures 20 mm bore × 52 mm OD × 21 mm width (0.787 × 2.047 × 0.827 in), mass about 210 g. It has two contact rubber seals and a lifetime grease fill.
How does the bore code in 62304 work?
The final two digits of 62304 are bore code 04, multiplied by 5 to give 20 mm.
What is the difference between 62304-2RS and a same-bore 62-series bearing?
Section height differs: 62304-2RS has a 16 mm radial section and C 15.9 kN; always match d, D and B — same bore alone never makes two bearings interchangeable.
Which fits should I use for 62304-2RS?
With a rotating inner ring use roughly k5 on the shaft and H7 in the 52 mm housing; reverse the interference if the outer ring rotates.
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.