The vibration and noise in bearings fall under one of three classes, Z1, Z2, or Z3. Both are measured using the SO910-II instrument. For special requirements, the BVT-1 is used, and the results are classified as V1, V2, or V3. Please refer to the charts shown below.

MAXIMUM VIBRATION ACCELERATION OF SINGLE BEARING AND NOMINAL 3mm~60mm

Tolerance in dB

d/mm Bore diameter	(0) Diameter Series (2)				(2) Diameter Series (2)					(3) Diameter Series (2)
d/mm Bore diameter	Z	Z1	Z2	Z3	Z		Z1	Z2	Z3	Z	Z1		Z2	Z3
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	46	31	48	46	42	38	33
17	46	44	40	35	47	45	41	46	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	56	52	50	46	43	39	54	52	47	44	40
40	53	51	46	42	54	52	47	44	40	56	54	49	45	41
45	55	53	48	45	41	54	49	46	43	58	56	51	47	44
50	57	54	50	47	58	55	51	48	45	60	57	53	49	46
65	59	56	52	49	60	57	53	50	47	62	59	54	51	48
60	61	58	54	51	62	59	54	51	48	64	61	56	53	50

MAXIMUM VIBRATION ACCELERATION OF SINGLE BEARING AND NOMINAL 65mm~80mm

Tolerance in dB

d/mm Bore diameter	(0) Diameter Series(2)			(2) Diameter Series(2)				(3) Diameter Series(2)
d/mm Bore diameter	Z	Z1	Z2	Z	Z1	Z2	Z3	Z	Z1	Z2	Z3
65	49	48	46	50	49	47	42	51	50	48	43
70	50	49	47	51	50	48	43	52	51	49	44
75	51	50	48	52	51	49	44	53	52	50	45
80	52	51	49	53	52	50	45	54	53	51	46

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Vibration and Noise Specs