THE-BEARINGS

TECHNIQUE INFORMATION

Materials
Bearing ring and Steel Ball are adopted with GCr15 to be made.
The Chemical Composition See Table 1.
The contrast of Bearing Steel No. of each country.See Table 2.
The preserving Shelf generally adopting H62 Brass Sheet or 0.8F cold rolling steel strap.punching to be made.also having plastics.phenol Aldehyde.and preserving shelf.

Steel No.	Chemical Composition(%)
Steel No.	C	Si	Mn	P	S	Cr
GCr15	0.95-0.15	0.15-0.35	0.25-0.45	<=0.025	<=0.025	1.40-1.65

Country	China	ISO	U.S.A	Germany	Japan	Sweden
Bearing Steel No.	GCr15	683/XVII1	(AISI)52100	(Din)100Cr6	(Jis)SVJ2	SKF3

Accuracy
According to the International Standard.the Accuracy of SL Bearing can be divided into five grades normal Grade 0,High Grade 6,Accurate grade 5,Over Accuracy Grade 4,and over the 4th grade2.
The grade of tolerance is in accordance with the standard of GB/T307.
The Contrast of Bearing Accuracy See Table 3.

Country	Standard	Accuracy Grade
China	GB307.1	0	6	5	4	2
International Standard Organization	ISO	0	6	5	4	2
Sweden	SKF	P0	P6	P5	P4	P2
Germany	DIN	P0	P6	P5	P4	P2
Japan	JIS	P0	P6	P5	P4	P2
American	ANSI	ABEC1	ABEC3	ABEC5	ABEC7	ABEC9

Vibration and Noise
According to its accuracy Grade of the vibration value of the Noise of SL Bearing (Vibration)it is to be divided in Z1,Z2,Z3three groups.It can also be in accordance with Speed Grade of Vibration Value (µm/s) V1、V2、V3 Groups to measure its vibration.(to see table 4.)
If users have no requirement for vibration.The Normal Grade Bearing usually to be leaving out of the factory is in Vibration Value of Z1 Group.

Bearing Vibration speed Grade can not be over the following Values（dB）

d	Diameter Series(1)			Diameter Series(2)			Diameter Series(3)
m	Z1	Z2	Z3	Z1	Z2	Z3	Z1	Z2	Z3
3	34	32	28	35	32	30	36	33	31
4	34	32	28	35	32	30	36	33	31
5	36	34	30	37	34	32	37	35	33
6	36	34	30	37	34	32	37	35	33
7	38	35	31	38	36	34	-	-	-
8	38	35	31	38	36	34	-	-	-
9	40	36	32	40	37	35	-	-	-
10	42	38	33	42	39	35	44	40	37
12	43	39	34	43	39	35	55	40	37
15	44	40	35	44	41	36	46	42	38
17	44	40	35	45	41	36	47	42	38
20	45	41	36	46	42	38	48	43	39
25	46	42	38	47	43	40	49	44	41
30	47	43	39	48	44	41	50	45	42
35	49	45	41	50	46	43	52	47	44
40	51	46	42	52	47	44	54	49	45
45	43	48	45	54	49	46	56	51	47
50	54	50	47	55	51	48	57	53	49
55	56	52	49	57	53	50	59	54	51
60	58	54	51	59	54	51	61	56	53

Single Bearing Vibration Speed Grade Allowed The Limit Value(µm/s) tablb 5.

d	V1			V2			V3
d	Low Brand	Medium Brand	High Brand	Low Brand	Medium Brand	High Brand	Low Brand	Medium Brand	High Brand
mm	Low Brand	Medium Brand	High Brand	Low Brand	Medium Brand	High Brand	Low Brand	Medium Brand	High Brand
5	90	60	50	58	36	30	35	21	18
6	90	60	50	58	36	30	35	21	18
7	110	80	65	72	48	40	44	28	24
8	110	80	65	72	48	40	44	28	24
9	110	80	65	72	48	40	44	28	24
10	140	100	85	90	60	50	55	35	30
12	140	100	85	90	60	50	55	35	30
15	180	130	100	110	78	60	65	46	35
17	180	130	100	110	78	60	65	46	35
20	220	160	125	130	100	75	80	60	45
25	220	160	125	130	100	75	80	60	45
30	250	200	160	150	120	100	90	75	60
35	250	200	160	150	120	100	90	75	60
40	300	250	220	180	150	130	110	90	80

Clearance
In accordance with standard of ISO 5753.The radial Clearance of SL Bear can be divided into five groups.
Radial Clearance Value without load See Table 6.
Generally it is according to the manufacturing and installation of the basic group of Clearance.The users who need the Radial Clearance except the basic group should put down their requirements in the contract.
Table 6 the Radial Clearance of the Deep Groove Ball Rearing
Note:C2 Group Clearance only for Bearings over 6 Grade Accurancy.

Bore diameter d(mm)		group 2		Standard group		group 3		group4		group5
Over	To	Min.	Max.	Min.	Max.