What is the difference between a 6205 and a 6305 bearing?

Both have a 25 mm bore. The 6305 is larger, 62 × 17 mm against 52 × 15 mm, and has a higher load rating.

What size is a 6306 bearing?

30 mm bore, 72 mm outside diameter and 19 mm wide, with a minimum chamfer of 1.1 mm.

6300 bearing size chart: 6305, 6306 and every size to 6320

6300 series bearing dimensions

6300 series bearing dimensions
Bearing	dmm	Dmm	Bmm	rmin, mm	Clowest of makers, kN	Chighest of makers, kN	C0lowest of makers, kN	C0highest of makers, kN
6300	10	35	11	0.6	8.1	9.1	3.4	3.5
6301	12	37	12	1	9.7	10.8	4.15	4.2
6302	15	42	13	1	11.4	12.7	5.4	5.45
6303	17	47	14	1	13.6	15	6.55	6.65
6304	20	52	15	1.1	15.9	17.6	7.8	7.9
6305	25	62	17	1.1	20.6	23.5	10.9	11.6
6306	30	72	19	1.1	26.6	29.6	15	16
6307	35	80	21	1.5	33.4	37	19	19.2
6308	40	90	23	1.5	40.7	45	24	24
6309	45	100	25	1.5	48.8	58.5	29.3	32
6310	50	110	27	2	57.5	68.5	35.3	38.5
6311	55	120	29	2	71.5	79.5	44.5	45
6312	60	130	31	2.1	81.8	90.5	51.8	52
6313	65	140	33	2.1	92.6	103	59.7	60
6314	70	150	35	2.1	104	115	68	68
6315	75	160	37	2.1	113.4	126	76.5	77
6316	80	170	39	2.1	123	136	86.5	86.5
6317	85	180	41	3	132.7	147	96.5	97
6318	90	190	43	3	142.6	158	107	108
6319	95	200	45	3	152.7	169	118	119
6320	100	215	47	3	173	192	140	141

Dimensions in millimetres unless stated. Select a row to load its CAD files above.

Bearing dimensions to ISO 15 and load ratings

Bore d, outside diameter D, width B and the minimum chamfer r are boundary dimensions set by ISO 15, so they are the same whichever maker you buy from. Load ratings are not: each maker publishes its own. The table gives the lowest and highest basic dynamic (C) and static (C0) ratings among the catalogues we checked; use your supplier's figure for the calculation.

The CAD file is a simplified shielded bearing: both rings with their chamfers and the space between them closed by flat shields. It is meant for assemblies and drawings, not for showing the balls and cage.

6305 and 6306 bearing size against the 6200 series

For the same bore, a 6300 bearing is larger and wider than its 6200 counterpart and carries more load. A 6305 is 25 × 62 × 17 mm against 25 × 52 × 15 mm for the 6205, and the makers' dynamic ratings in the tables go from 14 to 15.5 kN for the 6205 and from 20.6 to 23.5 kN for the 6305. A 6306 is 30 × 72 × 19 mm.

6300 bearings: common questions

What is the difference between a 6205 and a 6305 bearing?: Both have a 25 mm bore. The 6305 is larger, 62 × 17 mm against 52 × 15 mm, and has a higher load rating.
What size is a 6306 bearing?: 30 mm bore, 72 mm outside diameter and 19 mm wide, with a minimum chamfer of 1.1 mm.

Sources the dimensions were checked against (4)