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Bore(mm)	Noise Level(dB)
	6000 series				6200 series					6300 series
	Z	Z1	Z2	Z3	Z	Z1	Z2	Z3	Z4	Z	Z1	Z2	Z3	Z4
3	35	34	32	28	36	35	32	30		37	36	33	31
4	35	34	32	28	36	35	32	30		37	36	33	31
5	37	36	34	30	38	37	34	32		39	37	35	33
6	37	36	34	30	38	37	34	32		39	37	35	33
7	39	38	35	31	40	38	36	34
8	39	38	35	31	40	38	36	34
9	41	40	36	32	42	40	37	35
10	43	42	38	33	44	42	39	35	30	46	44	40	37	32
12	44	43	39	34	45	43	39	35	30	47	45	40	37	32
15	45	44	40	35	46	44	41	36	31	48	46	42	38	33
17	45	44	40	35	47	45	41	36	31	49	47	42	38	33
20	47	45	41	36	48	46	42	38	33	50	48	43	39	34
22	47	45	41	36	48	46	42	38	33	50	48	43	39	34
25	48	46	42	38	49	47	43	40	36	51	49	44	41	37
28	49	47	43	39	50	48	44	41	37	52	50	45	42	38
30	49	47	43	39	50	48	44	41	37	52	50	45	42	38
32	50	48	44	40	51	49	45	42	38	53	51	46	43	39
35	51	49	45	41	52	50	46	43	39	54	52	47	44	40
40	53	51	46	42	54	52	47	44	40	56	54	49	46	41
45	55	53	48	45	56	54	49	46	43	58	56	51	47	44

Bore(mm)	V			V1			V2			V3
Bore(mm)	Low	Middle	High	Low	Middle	High	Low	Middle	High	Low	Middle	High
3	80	44	44	60	35	32	48	26	22	31	16	15
4	80	44	44	60	35	32	48	26	22	31	16	15
5	110	72	60	74	48	40	58	36	30	35	21	18
6	110	72	60	74	48	40	58	36	30	35	21	18
7	130	96	80	92	66	54	72	48	40	44	28	24
8	130	96	80	92	66	54	72	48	40	44	28	24
9	130	96	80	92	80	54	72	48	40	44	28	24
10	160	120	100	120	80	70	90	60	50	55	35	30
12	160	120	100	120	100	70	90	60	50	55	35	30
15	210	150	120	150	100	85	110	78	60	65	46	35
17	210	150	120	150	125	85	110	78	60	65	46	35
20	260	190	150	180	125	100	130	100	75	80	60	45
22	260	190	150	180	125	100	130	100	75	80	60	45
25	260	190	150	180	125	100	130	100	75	80	60	45
28	260	190	150	180	125	100	130	100	75	80	60	45
30	300	240	190	200	150	130	150	120	100	90	75	60
32	300	240	190	200	150	130	150	120	100	90	75	60
35	300	240	190	200	150	130	150	120	100	90	75	60
40	360	300	260	240	180	160	180	150	130	110	90	80
45	360	300	260	240	180	160	180	150	130	110	90	80
50	420	320	320	280	200	200	210	160	160	125	100	100

The vibration and noise of deep groove ball bearings are normally classified as Z1, Z2(higher class than Z1), and Z3 (highest class). It is usually measured by instrument of SO910-1. While for bearings used for electric motors, the vibration & noise is measured by BVT-1 and classified as EMQ ZV1, ZV2 and ZV3. Customer needs to mark the requirement of vibration and noise class in order.