Deep-Groove Ball Bearing Sizes

Boundary dimensions (bore × OD × width) for the common deep-groove series through 60 mm bore: thin-section 6800/6900, the 6000/6200/6300 series, and the 60x/62x miniatures (including the 608). Suffixes like ZZ or 2RS change seals and shields, never the dimensions — a 6203, 6203-ZZ, and 6203-2RS are all the same size.

Printable wall chart: bearing-chart.pdf.

Identify a bearing from measurements

Millimeters (bearing dimensions are metric worldwide); add ″ for inches. Bore is enough to start — OD and width narrow the series. Try:

Decode a marked bearing

Try:

How to measure

Caliper the bore across the inner-ring hole and the OD across the outer ring — both are ground surfaces that measure within a few hundredths of a millimeter of nominal, so trust small readings like 16.99. Measure width across the ring faces, not across a protruding seal. If the bearing is marked, decode the marking instead — it's more reliable than calipers.

Chart by series

Thin section (6800) series

Designation	Bore	OD	Width	Bore ″
6800	10 mm	19 mm	5 mm	0.3937″
6801	12 mm	21 mm	5 mm	0.4724″
6802	15 mm	24 mm	5 mm	0.5906″
6803	17 mm	26 mm	5 mm	0.6693″
6804	20 mm	32 mm	7 mm	0.7874″
6805	25 mm	37 mm	7 mm	0.9843″
6806	30 mm	42 mm	7 mm	1.1811″
6807	35 mm	47 mm	7 mm	1.3780″
6808	40 mm	52 mm	7 mm	1.5748″
6809	45 mm	58 mm	7 mm	1.7717″
6810	50 mm	65 mm	7 mm	1.9685″

Thin section (6900) series

Designation	Bore	OD	Width	Bore ″
6900	10 mm	22 mm	6 mm	0.3937″
6901	12 mm	24 mm	6 mm	0.4724″
6902	15 mm	28 mm	7 mm	0.5906″
6903	17 mm	30 mm	7 mm	0.6693″
6904	20 mm	37 mm	9 mm	0.7874″
6905	25 mm	42 mm	9 mm	0.9843″
6906	30 mm	47 mm	9 mm	1.1811″
6907	35 mm	55 mm	10 mm	1.3780″
6908	40 mm	62 mm	12 mm	1.5748″
6909	45 mm	68 mm	12 mm	1.7717″
6910	50 mm	72 mm	12 mm	1.9685″

Extra light (6000) series

Designation	Bore	OD	Width	Bore ″
6000	10 mm	26 mm	8 mm	0.3937″
6001	12 mm	28 mm	8 mm	0.4724″
6002	15 mm	32 mm	9 mm	0.5906″
6003	17 mm	35 mm	10 mm	0.6693″
6004	20 mm	42 mm	12 mm	0.7874″
6005	25 mm	47 mm	12 mm	0.9843″
6006	30 mm	55 mm	13 mm	1.1811″
6007	35 mm	62 mm	14 mm	1.3780″
6008	40 mm	68 mm	15 mm	1.5748″
6009	45 mm	75 mm	16 mm	1.7717″
6010	50 mm	80 mm	16 mm	1.9685″
6011	55 mm	90 mm	18 mm	2.1654″
6012	60 mm	95 mm	18 mm	2.3622″

Light (6200) series

Designation	Bore	OD	Width	Bore ″
6200	10 mm	30 mm	9 mm	0.3937″
6201	12 mm	32 mm	10 mm	0.4724″
6202	15 mm	35 mm	11 mm	0.5906″
6203	17 mm	40 mm	12 mm	0.6693″
6204	20 mm	47 mm	14 mm	0.7874″
6205	25 mm	52 mm	15 mm	0.9843″
6206	30 mm	62 mm	16 mm	1.1811″
6207	35 mm	72 mm	17 mm	1.3780″
6208	40 mm	80 mm	18 mm	1.5748″
6209	45 mm	85 mm	19 mm	1.7717″
6210	50 mm	90 mm	20 mm	1.9685″
6211	55 mm	100 mm	21 mm	2.1654″
6212	60 mm	110 mm	22 mm	2.3622″

Medium (6300) series

Designation	Bore	OD	Width	Bore ″
6300	10 mm	35 mm	11 mm	0.3937″
6301	12 mm	37 mm	12 mm	0.4724″
6302	15 mm	42 mm	13 mm	0.5906″
6303	17 mm	47 mm	14 mm	0.6693″
6304	20 mm	52 mm	15 mm	0.7874″
6305	25 mm	62 mm	17 mm	0.9843″
6306	30 mm	72 mm	19 mm	1.1811″
6307	35 mm	80 mm	21 mm	1.3780″
6308	40 mm	90 mm	23 mm	1.5748″
6309	45 mm	100 mm	25 mm	1.7717″
6310	50 mm	110 mm	27 mm	1.9685″
6311	55 mm	120 mm	29 mm	2.1654″
6312	60 mm	130 mm	31 mm	2.3622″

Miniature (60x) series

Designation	Bore	OD	Width	Bore ″
604	4 mm	12 mm	4 mm	0.1575″
605	5 mm	14 mm	5 mm	0.1969″
606	6 mm	17 mm	6 mm	0.2362″
607	7 mm	19 mm	6 mm	0.2756″
608	8 mm	22 mm	7 mm	0.3150″
609	9 mm	24 mm	7 mm	0.3543″

Miniature (62x) series

Designation	Bore	OD	Width	Bore ″
623	3 mm	10 mm	4 mm	0.1181″
624	4 mm	13 mm	5 mm	0.1575″
625	5 mm	16 mm	5 mm	0.1969″
626	6 mm	19 mm	6 mm	0.2362″
627	7 mm	22 mm	7 mm	0.2756″
628	8 mm	24 mm	8 mm	0.3150″
629	9 mm	26 mm	8 mm	0.3543″

Common suffixes

Suffix	Meaning
ZZ / 2Z	steel shields both sides (metal, non-contact)
Z	steel shield, one side
2RS	contact rubber seals both sides (SKF 2RS1, NSK DDU, NTN LLU)
RS	contact rubber seal, one side
2RZ	low-friction non-contact seals both sides (NSK VV, NTN LLB)
C3	radial internal clearance greater than Normal (common in motors)
C2	radial internal clearance smaller than Normal
NR	snap ring groove in the outer ring, with snap ring
P6 / P5 / P4	ISO precision classes (≈ ABEC 3 / 5 / 7)

Suffix conventions vary by manufacturer; the equivalents above cover the common catalogs. Seals and shields never change the boundary dimensions.

Data provenance. ISO 15, Rolling bearings — Radial bearings — Boundary dimensions (general plan) (ISO). Nominal boundary dimensions; running fits and shaft/housing tolerances are an application decision — consult a bearing catalog's fit tables. See all data sources.