61808-2RZ Deep Groove Ball Bearing (40x52x7mm)

How to read this designation →

d — BoreD — Outside DiameterB — Width

Bearing dimensions and basic technical information.

Schematic of a non-contact sealed (2RZ) single-row deep groove ball bearing with rubber seals

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

Bore diameter (d)40 mm

Outer diameter (D)52 mm

Width (B)7 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: 61808

Related designations: SKF 61808-2RZ · NSK 6808VV · NTN 6808LLB

Suffix Information

Suffix Code2RZ

CategorySeal

MeaningNon-contact rubber seals on both sides

DescriptionRubber sealing washers on both sides whose lip does not touch the inner ring. Friction stays low, and protection is better than a metal shield but below a contact seal.

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 61808-2RZ	C4.49 kN	C03.75 kN	Pu0.16 kN
NSK 6808VV	Cr7 kN	C0r5.55 kN	—
NTN 6808LLB	Cr5.65 kN	C0r4.4 kN	Cu0.291 kN

Speed Ratings

Speed limits depend on sealing and lubrication, and definitions differ by manufacturer. The figures below are for this sealed version (61808-2RZ). Non-contact seals and shields run close to the open bearing. Always confirm the exact variant in the manufacturer's table.

Brand	Grease sealed (2RZ)	Oil sealed (2RZ)	Reference	Limiting
SKF 61808-2RZ	—	—	—	—
NSK 6808VV	—	—	—	—
NTN 6808LLB	—	—	—	—

SKF, NSK and NTN do not publish a limiting speed for this sealed variant.

References

SKF — SKF Group, Rolling Bearings, PUB BU/P1 17000/1 EN, Oct. 2018.
NSK — NSK Ltd., Rolling Bearings for Industrial Machinery, CAT. No. E1103, Tokyo, Japan, Jan. 2025.
NTN — NTN Corporation, Ball and Roller Bearings, CAT. No. 2203-3E, Osaka, Japan, Sep. 2000.

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	61808 \| 61808-2RS \| 61808-2Z \| 6808LLH
Angular Contact Ball Bearing	71808