6304-2RSL Deep Groove Ball Bearing (20x52x15mm)

How to read this designation →

d — BoreD — Outside DiameterB — Width

Bearing dimensions and basic technical information.

Schematic of a low-friction contact-sealed (2RSL) single-row deep groove ball bearing with rubber seals

Schematic only — for the actual construction, refer to each manufacturer's information.

Bore diameter (d)20 mm

Outer diameter (D)52 mm

Width (B)15 mm

TypeDeep Groove Ball Bearing

RowSingle Row

ClearanceCN

Cage

Material Steel

Cage materials — Deep Groove Ball Bearing

Suffix	Material	Printed by
`(none)`	Pressed steel	NSK, NTN, Timken
`M / MA / MB`	Machined brass	SKF, Schaeffler (FAG), Timken
`TN9 / TVP / TVH`	Polyamide (glass-fibre reinforced PA66)	SKF, Schaeffler (FAG)
`PH`	PEEK	SKF

Suffix letters are set by each manufacturer; the third column names the brands that print the row. Always confirm the exact variant in the manufacturer's table.

Clearance groups

Group	Meaning
`C2`	Radial internal clearance smaller than normal
`CN`	Normal clearance — the ISO default group, usually not printed in the designation (SKF/FAG may write it as CN or C0)
`C3`	Radial internal clearance greater than normal
`C4`	Greater than C3

CN is the ISO normal clearance group and is usually not printed in the designation; other groups include C2, C3 and C4. The numeric ranges are defined per bearing type and size (ISO 5753), so always compare them in the manufacturer's table.

Bearing materials

Material	Where it appears
Bearing steel	Rings and rolling elements — the standard for every model without a special material note
Stainless steel	Corrosion-resistant versions, e.g. the SKF "W" series
Ceramic rolling elements (hybrid)	Ceramic balls or rollers running in steel rings; electrically insulating and tolerant of poor lubrication
Ceramic-coated steel rings	SKF INSOCOAT: VL0241 coats the outer ring, VL2071 the inner ring (electrical insulation against stray currents)

The material refers to the rings and the rolling elements. Unless a special material is stated, both are bearing steel.

Base model: 6304

Related designations: SKF 6304-2RSL

Suffix Information

Suffix Code2RSL

CategorySeal

MeaningLow-friction seals on both sides

DescriptionLow-friction rubber seals on both sides (SKF RSL): a lighter sealing lip than a standard contact seal, so friction is lower while protection stays above that of a shield. The catalogue prints a separate limiting speed for this writing.

Manufacturer Ratings

Load-rating symbols are printed as each manufacturer writes them in its own catalogue, so the same quantity can carry a different symbol from brand to brand.

Brand	Dynamic Load Rating	Static Load Rating	Fatigue Load Limit
SKF 6304-2RSL	C16.8 kN	C07.8 kN	Pu0.335 kN

Speed Ratings

Speed limits depend on sealing and lubrication, and definitions differ by manufacturer. The figures below are for this sealed version (6304-2RSL). Contact seals are greased for life and run slower than the open bearing. Always confirm the exact variant in the manufacturer's table.

Single-side (-RSL) and double-side (-2RSL) low-friction seals have the same limiting speeds (SKF Rolling Bearings, PUB BU/P1 17000).

Brand	Grease sealed (2RSL)	Oil sealed (2RSL)	Reference	Limiting
SKF 6304-2RSL	—	—	30,000 r/min	15,000 r/min

References

SKF — SKF Group, Rolling Bearings, PUB BU/P1 17000/1 EN, Oct. 2018.

Related Guides

Disclaimer: Data on this page is compiled from publicly available online sources for reference only, and not every model appears in a manufacturer's published catalog. Values may differ between sources and editions — always verify against the manufacturer's current documentation before design or purchase.Full disclaimer →

Deep Groove Ball Bearing	6304 \| W 6304 \| W 6304-2RS1 \| W 6304-2Z \| 6304-2RS \| 6304-2RZ \| 6304-2Z \| 6304-LLH \| 6304-RS \| 6304-RSL \| 6304-Z
Self-Aligning Ball Bearing	1304
Spherical Roller Bearing	21304
Angular Contact Ball Bearing	7304 \| 7304-2RS \| 7304-2RZ
Cylindrical Roller Bearing	N304 \| NJ304 \| NU304 \| NUP304
Four-Point Contact Ball Bearing	QJ304