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Materials

The rings and ball of bearing are made of steel GCr15 or stainless steel 9Cr18; the cage is formed to be punched of quality cold-rolled steel; it also can be adopted plastics if necessary.

Table 1
No (%)Chemical Composition(%)
steel No. C Si Mn P S Cr
GCR 15 095-1.05 0.15-0.35 0.25-0.45 0.02 <0.0251.40-1.65
Table 2 Corresponding designation equivalent GCr15
china ISO U.S.A Germany Japan Sweden
GCr15 683/Ⅶ 1 (AISI)52100 (DIN)100Cr6 (JIs)SuJ2 SKF3

Accuracy

Now the accuracy of“YSK”bearing can be divide into three grades: common quality P0 class, P6 class, and P5 class.

Table 3
The contrast of bearing accuracy grade
Country standard Accuracy Grade
China GB 0 6 5 4 2
lnternational standard ISO 0 6 5 4 2
sweden SKF P0 P6 P5 P4 P3
Germany DIN P0 P6 P5 P4 P3
Japan JIS P0 P6 P5 P4 P3
America ANSI ABEC1 ABEC3 ABEC5 ABEC7 ABEC9
Table 4
Inner Ring of 0 Grade Tolerance
d mm dmp vdp(2) Vdmp Kia Bs VBs
Diameter series
9 0,1 2,3,4 All normal Fix(3)
Exceed To Deviation Deviation Max Max Max Deviation Deviation Max
0.6(1) 2.5 0 -8 10 8 6 6 10 0 -40 - 12
2.5 10 0 -8 10 8 6 6 10 0 -120 -250 15
10 18 0 -8 10 8 6 6 10 0 -120 -250 20
18 30 0 -10 13 10 8 8 13 0 -120 -250 20
30 50 0 -12 15 12 9 9 15 0 -120 -250 20
50 80 0 -15 19 19 11 11 20 0 -150 -280 25
Note: (1)Including 0.6
(2)Diameter series 7 and 8, no regular cost
(3)Indicating the single internal ring of the bearing to be used in pair or group during installation
Table 5
out Ring of 0 Grade Tolerance
D mm D mp vdp(2)(4) Vdmp kea Cs Vcs
Open bearing closed bearing (3)
Diameter series
9 0,1 2,3,4 2,3,4 All normal Fix(3)
Exceed To Deviation Deviation Max Max Max Deviation Deviation Max
2.5(1) 6 0 -8 10 8 6 10 6 15 Same as Bs and vBs of the same bearing inner ring
6 18 0 -8 10 8 6 10 6 15
18 30 0 -9 12 9 7 12 7 15
30 50 0 -11 14 11 8 16 8 20
50 80 0 -13 16 13 10 20 10 25
80 120 0 -15 19 19 11 26 11 35
Note: (1)Including 2.5
(2)Diameter series 7 and 8, no regular cost(3)Diameter series 9，0 and 1, no regular cost
(4)Suitable for inside and outside brake ring befor installation or after discharge
Table 6
Inner Ring of 6 Grade Tolerance
d mm dmp vdp(2) Vdmp Kia Bs VBs
Diameter series
9 0,1 2,3,4 All normal Fix(3)
Exceed To Deviation Deviation Max Max Max Deviation Deviation Max
0.6(1) 2.5 0 -7 9 7 5 5 5 0 -40 - 12
2.5 10 0 -7 9 7 5 5 5 0 -120 -250 15
10 18 0 -7 9 7 5 5 7 0 -120 -250 20
18 30 0 -8 10 8 6 6 8 0 -120 -250 20
30 50 0 -10 13 10 8 8 10 0 -120 -250 20
50 80 0 -12 15 15 9 9 10 0 -150 -280 25
Note: ( 1)Including o.6
(2)Diameter series 7 and 8,no regular cost
(3)Indicating the single internal ring of the bearing to be used in pair or group during installation
Table 7
out Ring of 6 Grade Tolerance
D mm D mp vdp(2)(4) Vdmp kea Cs Vcs
Open bearing closed bearing (3)
Diameter series
9 0,1 2,3,4 2,3,4 All normal Fix(3)
Exceed To Deviation Deviation Max Max Max Deviation Deviation Max
2.5(1) 6 0 -7 9 7 5 9 5 8 Same as Bs and vBs of the same bearing inner ring
6 18 0 -7 9 7 5 9 5 8
18 30 0 -8 10 8 6 10 6 9
30 50 0 -9 11 9 7 13 7 10
50 80 0 -11 14 11 8 16 8 13
80 120 0 -13 16 16 10 20 10 18
Note: ( 1)Including 2.5
(2)Diameter series 7 and 8, no regular cost(3)Diameter series no regular cost
(4)Suitable for inside and outside brake ring befor installation or after discharge
Table 8
Inner Ring of 5 Grade Tolerance
d mm dmp vdp(2) Vdmp Kia Sd(4) Sea(4) Bs VBs
Diameter series
9 0,1,2,3,4 All normal Fix(3)
Exceed To Deviation Deviation Max Max Max Max Max Deviation Deviation Max
0.6(1) 2.5 0 -5 5 4 3 4 7 7 0 -40 -250 5
2.5 10 0 -5 5 4 3 4 7 7 0 -40 -250 5
10 18 0 -5 5 4 3 4 7 7 0 -40 -250 5
18 30 0 -6 6 5 3 4 8 8 0 -120 -250 5
30 50 0 -8 8 6 4 5 8 8 0 -120 -250 5
50 80 0 -9 9 7 5 6 8 8 0 -120 -280 6
Note: (1)Including 0.6
(2)Diameter series 7 and 8,no regular cost(3)only suitable for groove type ball bearing
Table 9
out Ring of 5 Grade Tolerance
d mm dmp vdp(2) Vdmp Kia Sd(4) Sea(4) Bs VBs
Diameter series
9 0,1,2,3,4 All normal
Exceed To Deviation Deviation Max Max Max Max Max Deviation Deviation Max
2.5(1) 6 0 -5 5 4 3 5 8 8 Same as Bs and vBs of the same bearing inner ring 5
6 18 0 -5 5 4 3 5 8 8 5
18 30 0 -6 6 5 3 6 8 8 5
30 50 0 -7 7 5 4 7 8 8 5
50 80 0 -9 9 7 5 8 8 10 6
80 120 0 -10 10 8 5 10 9 11 8
Note: (1)Including 2.5
(2)Diameter series 7 and 8,no regular cost
(3)There is no regular cost in bearing of closed type(4)Unsuitable for the outside flange of the bearing

Vibration And Noise

According to related standard, the vibration noise (dB) of bearings for their vibration under acceleration are divided into four groups: Z1, Z2, Z3, and Z4. Also they can be divided into four groups in according to vibration speed (um/s): V1, V2, V3, and V4. Now can meet to under acceleration group Z1, Z2, Z3, Z4; and vibration speed group V1, V2, V3.

Single bearing vibration noise under acceleration specification is shown on table No.10. Single bearing vibration speed specification is shown on table No.11

Single Bearing acceleration Grade Can Not Be Over The Following Value
Table 10
mm 0 2 3
Diameter Series Diameter Series Diameter Series
Bore diameter Z1 Z2 Z3 Z4 ZP3 ZP4 Z1 Z2 Z3 Z4 ZP3 ZP4 Z1 Z2 Z3 Z4 ZP3 ZP4
5 36 24 30 26 46 42 37 34 32 28 48 44 37 35 33 29 49 45
6 36 34 30 26 46 42 37 34 32 28 48 44 37 35 33 29 49 45
7 38 35 34 27 47 43 38 36 34 29 50 45 39 37 33 30 51 46
8 38 35 34 27 47 43 38 36 34 29 50 45 39 37 33 30 51 46
9 40 36 32 28 48 44 40 37 35 30 51 46 41 39 37 32 53 48
10 42 38 33 28 49 44 42 39 35 30 51 46 44 40 37 32 53 48
12 43 39 34 29 50 45 43 39 35 30 51 46 45 40 37 32 53 48
15 44 40 35 30 51 46 44 41 36 31 52 47 46 42 38 33 54 49
17 44 40 35 30 51 46 44 41 36 31 52 47 46 42 38 33 54 49
20 45 41 36 31 52 47 46 42 38 33 54 49 50 43 39 34 55 50
22 45 41 36 31 52 47 46 42 38 33 54 49 50 43 39 34 55 50
25 46 42 38 34 54 50 47 43 40 36 56 52 49 44 41 37 57 53
28 47 43 39 35 55 51 48 44 41 37 57 53 50 45 42 38 58 54
30 47 43 39 35 55 51 48 44 41 37 57 53 50 45 42 38 58 54
32 48 44 40 36 56 52 49 45 42 38 58 54 51 46 43 39 59 55
35 49 45 41 37 57 53 50 46 43 39 59 55 52 47 44 40 60 56
40 51 46 42 38 58 54 52 47 44 40 60 56 54 49 45 41 61 57
45 53 48 45 42 61 58 54 49 46 43 62 59 56 51 47 44 63 60
50 54 50 47 44 63 60 55 51 48 45 64 61 57 53 49 46 65 62
55 56 52 49 46 65 62 57 53 50 47 66 63 59 54 51 48 67 64
60 58 54 51 48 67 64 59 54 51 48 67 64 61 56 53 50 69 66
single Bearing vibration Speed Grade Allowed The Limit value
Table 11
mm V1 V2 V3 V4
Bore diameter Low Frequency Medium Frequency High Frequency Low Frequency Medium Frequency High Frequency Low Frequency Medium Frequency High Frequency Low Frequency Medium Frequency High Frequency
3 60 35 32 48 23 22 31 16 15 28 10 10
4 60 35 32 48 23 22 31 16 15 28 10 10
5 74 48 40 58 36 30 35 21 18 32 11 11
6 74 48 40 58 36 30 35 21 18 32 11 11
7 92 66 54 72 48 40 44 28 24 38 12 12
8 92 66 54 72 48 40 44 28 24 38 12 12
9 92 66 54 72 48 40 44 28 24 38 12 12
10 120 80 70 90 60 50 55 35 30 45 14 15
12 120 80 70 90 60 50 55 35 30 45 14 15
16 150 100 85 110 78 60 65 46 35 52 48 48
17 150 100 85 110 78 60 65 46 35 52 25 25
20 180 125 100 130 100 75 80 60 45 60 25 25
22 180 125 100 130 100 75 80 60 45 60 30 32
25 180 125 100 130 100 75 80 60 45 60 30 32
28 180 125 100 130 100 75 80 60 45 60 35 40
30 200 150 130 150 120 100 90 75 60 70 35 40
32 200 150 130 150 120 100 90 75 60 70 35 40
35 200 150 130 150 120 100 90 75 60 70 42 45
40 240 180 160 180 150 130 110 90 80 82 50 50
45 240 180 160 180 150 130 110 90 80 82 60 60
50 280 200 200 210 160 160 125 100 100 95 70 70
55 280 220 200 210 160 160 125 100 100 95 70 70
60 320 220 240 240 180 200 145 110 130 100 80 80

Clearance

The radial clearance of“YSK”bearings might be divided into five groups according to ISO5753. The radial clearance without pre-load is shown on the table 12. The clearance can be met according to your demand.

Radial Clearance
Table 12
Bore diameter group 2 Standard group  group 3 group 4 group 5
Exceed 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
40 50 1 11 6 23 18 36 30 51 45 73
50 65 1 15 8 28 23 43 38 61 55 90
65 80 1 15 10 30 25 51 46 71 65 105
Packing

Generally bearing is to be packed into plastic tube or wrapped by rustproof paper, then packed into the arton. Single package is also available.

Dustproof, Sealing and Lubrication

The structure of bearings consists of open and close, and the close type might be equipped with shields (Z or ZZ); with non-contact seals (RZ or 2RZ), and with contact seals (RS or 2RS). You can choose by your demand of USING.

The bearings with double-shields or seals(ZZ or 2RS) already been filled generally grease, they are suitable for light to middle load, low to middle speed and working temperature -20℃ to 110℃. We also can choose another usage and brand of grease for your special case.

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