6810 Bearing Dimensions: 50x65x7mm, Seals + Equivalents

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Reviewed by MLC Editorial Team | 16 August 2026

Verified by Rachel Mayfield, Supply Chain Analyst - August 2026

The 6810 is a single-row deep groove ball bearing measuring 50x65x7 mm (bore x outside diameter x width). Those boundary dimensions come from ISO 15, so a 6810 from SKF, NSK, NTN, EZO, NMB or any budget brand is dimensionally interchangeable - the differences are in materials, precision grade, internal clearance and seal design, not size.

6810 bearing dimensions

Property	Value	Standard
Bore diameter (d)	50 mm	ISO 15
Outside diameter (D)	65 mm	ISO 15
Width (B)	7 mm	ISO 15
Bearing type	Single-row deep groove ball bearing	ISO 15
Dimension series	6800 thin section (ISO dimension series 18)	ISO 15

Always measure a worn bearing before ordering if the number is unreadable: bore with calipers on the inner ring, outside diameter across the outer ring, and width across either ring face. 50x65x7 mm identifies the 6810 uniquely among common metric sizes.

6810 or 61810? Same bearing

The formal ISO designation for this size is 61810: dimension series 18 on a 50 mm bore. Most catalogues, bike shops and marketplaces shorten it to 6810. SKF and Schaeffler list it as 61810; NSK, NTN and most distributors sell it as 6810. It is the same bearing - order by whichever number the supplier uses and check the 50x65x7 mm dimensions match.

What the suffixes mean (6810ZZ, 6810-2RS, 6810-C3)

Suffix	Meaning	When to choose it
ZZ / 2Z	Metal shield both sides	Non-contact, low friction, keeps debris out. Not washdown-proof.
2RS / 2RS1 / DDU / LLU	Rubber seal both sides	Contact seals, best dirt and moisture exclusion, slightly more friction.
Z / RS	Shield or seal one side only	Open on the other side - used where relubrication is needed.
Open (no suffix)	No seals or shields	For housings with their own sealing and external lubrication.
C3	Extra internal clearance	For motors and anywhere the inner ring runs hotter than the outer.
2RS-C3	Sealed + C3 clearance	The standard electric-motor spec.

Brand equivalents for the 6810

Every major manufacturer makes the 6810. The seal and shield codes differ by brand but the bearings interchange directly:

Brand	Shielded version	Sealed version
SKF	6810-2Z	6810-2RSH
FAG (Schaeffler)	6810-2ZR	6810-2RSR
NSK	6810ZZ	6810DDU
NTN	6810ZZ	6810LLU
Koyo (JTEKT)	6810ZZ	6810-2RS

Load ratings: check the maker's catalogue

Dynamic (C) and static (C0) load ratings for the 6810 differ between manufacturers and between standard and premium ranges, so MLC does not publish a single figure. Look the value up in the manufacturer's own catalogue for the exact variant you are buying - SKF, Schaeffler medias, NSK and NTN all publish free online catalogues with per-variant ratings, limiting speeds and grease specifications.

Where the 6810 is used

The 6800 thin section (ISO dimension series 18) family is the thinnest common section for its bore - chosen when the shaft is large but radial space and weight are tight. Typical 6810 applications include robot arm bases, index tables and large hollow-shaft encoders.

Fitting basics

For a rotating shaft (the normal case), fit the inner ring with a light interference fit and the outer ring with a close clearance fit (H7 housing for most machinery). Press only on the ring you are fitting - pressing the outer ring through the balls to seat the inner ring is the fastest way to brinell a new bearing. For sealed 2RS variants, no relubrication is needed or possible; the factory grease fill is for life.

References

Need this bearing? Send the designation and quantity and Acumen Seals & Pumps will price it, including sealed, shielded and equivalent options.

Get a quote for 6810 Bearing Dimensions: 50x65x7mm, Seals + Equivalents

Acumen Seals & Pumps - UK specialist in mechanical seals, FFKM O-rings, Kalrez compounds, and elastomer parts. 36 years of inventory, UK stock with 24-48 hour despatch, and a price back within 4 working hours.

Send an enquiry via the MLC contact form

Frequently Asked Questions

What size is a 6810 bearing?

A 6810 bearing measures 50 mm bore x 65 mm outside diameter x 7 mm width. These boundary dimensions are fixed by ISO 15 and identical across all manufacturers.

What does 6810-2RS mean?

The 2RS suffix means the 6810 has rubber contact seals on both sides. It keeps grease in and dirt and moisture out, and is the right choice for most machinery. ZZ means metal shields instead - lower friction but less sealing.

Are 6810 bearings interchangeable between brands?

Yes. The 6810's dimensions are standardised for every maker, so an SKF 6810 swaps directly with NSK, NTN, Koyo or EZO. Match the suffix too: SKF 2RSH, NSK DDU and NTN LLU are all the sealed version.

Is a 61810 the same as a 6810?

Yes. 61810 is the formal ISO designation and 6810 is the trade shorthand for the same 50x65x7 mm thin-section bearing. SKF and Schaeffler catalogues use 61810; most shops sell it as 6810.

Independent UK engineering trade publication. Company profiles cross-referenced with Companies House.

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Get a UK price for a 6810 bearing

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