SPECIFICATIONS

Materials and Accuracy

Inspection and test

Vibration and Noise

Lubrication

Bearing Specifications

Bearing ring and ball are adopted with GCr15 to be made.
The Chemical of Bearing Steel No.of each country.See Table 1.
The preserving Shelf generally adoption H62 Brass Sheet of 0.8F cold rolling steel strap.punching to be made,also having plastics,phasics,phenol Aldehyde and presserving shelf.

Country	China	ISO	U.S.A	Germany	Japan	Sweden
Bearing Steel No.	GCr15	683/XVII1	(AISI)52100	(Din)100Cr6	(Jis)SUJ2	SKF3

According to the International Standard,the Accuracy of 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/T307.1-94.
The contrast of Bearing Accuracy See Table 2.

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

Radial Clearances
The radial clearances of our bearings can be classified into C2，C3，C4&C5 according to customer's request.

TABLE OF RADIAL CLEANANCE(UM)

Bore Diameter		C2		Standard		C3		C4		C5
over	to	min	max	min	max	min	max	min	max	min	max
2.5	6	0	7	2	13	8	23	-	-	-
6	10	0	7	2	13	8	23	14	29	20	37
10	18	0	9	3	18	11	25	18	33	25	45
18	24	0	10	5	20	13	28	20	36	28	48
24	30	1	11	5	20	13	28	23	41	30	53
30	40	1	11	6	20	15	33	28	46	40	64