top
SFB LOGO CHINESE ձ
˾ Company Profile HOME arrow Technology


Material
    The ring and balls of SFB bearings are made of refining bearing steel GCr15(AISI 52100),the retainer are punched from brass strip(H62)or top quality cold-rolled steel strip(SPCC BQB402)and reinforced engineering plastics are available if necessary.The shield is made of imported special material or (SPCC JISG3141)stainless steel (ICr18Ni9)strip and the bune-N rubber seal with phosphatizing steel skeleton are hot pressed
    The stainless steel bearing"s ring and balls refining stainless 9Crl8(AISI 440C).
    The chemical composition of bearing steel and stainless steel are listed as follows:
Steel No C% Si% Mn% S% P% Cr%
GCr15 0.95-1.05 0.15-0.3 0.25-0.45 0.025 0.025 1.3-1.6
9Cr18 0.90-1.05 0.8 0.8 0.04 0.03 16-19

Packing
    Generally SFB Bearing is to be packed in the plastic pipes or the thin membrane bags(10 sets).then to be packed into the medium size Paper Box(50 sets or 100 sets).Then all to be packed in to the carton as the external packing Small. The users who have any requirements in packing may write them down in the contract.     Tolerance
    SFB bearings are of motor class bearings and the common tolerance is shown on the attached data sheet.For any special tolerance indicated on the purchase order,custom-built service is available.
Comparisiion Table Of Tolerance Grade:
Country Standard Tolerance Grade
China GB 0 6 5 4
American ANSI ABEC-1 ABEC-3 ABEC-5 ABEC-7
ISO 0 6 5 4
Germany DIN P0 P6 P5 P4
Japan JIS P0 P6 P5 P4

Radial Play
    The radial play of bearings is specified as five groups as follows in accordance with Chinese national standard GB4604:
bearing bore(mm) group 2-C2 C0basic group C0 group 3-C3 group 4-C4 group 5-C5
bearing bore(mm) group 2-C2 C0basic group C0 group 3-C3 group 4-C4 group 5-C5
over inct. min max min max min max min max min max
over inct. min max min max min max min max min max
2.5 6 0 7 2 13 8 23 14 29 20 37
6 10 0 7 2 13 8 23 18 33 25 45
10 18 0 8 3 18 11 25 20 36 28 48
18 24 0 10 5 20 13 28 23 41 30 53
24 30 1 11 5 20 13 28 28 43 40 64
30 40 1 11 6 20 15 33

    Special radial play or shaft face clerance requirement could be made as specified in orders.
Vibratro and Noise
    Deep Groove Ball Bearing Accelerating Vibration Value(dB).See Table 1
    Deep Groove Ball Bearing Accelerating Vibration Value( m/s).See Table 2
    Table 1 Single Bearing Vibration speed Grade can not be over the following Values
bearing bore mm 0 2 3
bearing bore mm Z Z1 Z2 Z3 Z Z1 Z2 Z3 Z4 Z Z1 Z2 Z3 Z4
3 35 -
4 35 34 32 28 36 35 32 30 - 37 36 33 31 -
5 37 34 32 28 36 35 32 30 - 37 36 33 31 -
6 37 36 34 30 38 37 34 32 - 39 37 35 33 -
7 39 36 34 30 38 37 34 32 - 39 37 35 33 -
8 39 38 35 31 40 38 36 34 - - - - - -
9 41 38 35 31 40 38 36 34 - - - - - -
10 43 40 36 32 42 40 37 35 - - - - - 32
12 44 42 38 33 44 42 39 35 30 46 44 40 37 32
15 45 43 39 34 45 43 39 35 30 47 45 40 37 33
17 46 44 40 35 46 44 41 36 31 48 46 42 38 33
20 47 44 40 35 47 45 41 36 31 49 47 42 38 34
25 48 45 41 36 48 46 42 38 33 50 48 43 39 37
30 49 46 42 38 49 47 43 40 36 51 49 44 41 38
35 51 47 43 39 50 48 44 41 37 52 50 45 42 40
40 53 49 45 41 52 50 46 43 39 54 52 47 44 41
45 55 51 46 42 54 52 47 44 40 56 54 49 45 44
50 57 53 48 45 56 54 49 46 43 58 56 51 47 46
55 59 54 50 47 58 55 51 48 45 60 57 53 49 48
60 61 56 52 49 60 57 53 50 47 62 59 54 51 50
58 54 51 62 59 54 51 48 64 61 56 53

Table 2 Single Bearing Vibration Speed Grade Allowed The Limit Value m/s
Bore Diameter V V1 V2 V3
Bore Diameter
d mm
Low Brand Medium Brand High Brand Low Brand Medium Brand High Brand Low Brand Medium Brand High Brand Low Brand Medium Brand High Brand
Low Brand Medium Brand High Brand Low Brand Medium Brand High Brand Low Brand Medium Brand High Brand Low Brand Medium Brand High Brand
5 110 72 60 90 60 50 58 36 30 35 21 18
6 110 72 60 90 60 50 58 36 30 35 21 18
7 130 96 80 110 80 65 72 48 40 44 28 24
8 130 96 80 110 80 65 72 48 40 44 28 24
9 130 96 80 110 80 65 72 48 40 44 28 24
10 160 120 100 140 100 85 90 60 50 55 35 30
12 160 120 100 140 100 85 90 60 50 55 35 30
15 210 150 120 180 130 100 110 78 60 65 46 35
17 210 150 120 180 130 100 110 78 60 65 46 35
20 260 190 150 220 160 125 130 100 75 80 60 45
22 260 190 150 220 160 125 130 100 75 80 60 45
25 260 190 150 220 160 125 130 100 75 80 60 45
28 260 190 150 220 160 125 130 100 75 80 60 45
30 300 240 190 250 200 160 150 120 100 90 75 60
32 300 240 190 250 200 160 150 120 100 90 75 60
35 300 240 190 250 200 160 150 120 100 90 75 60
40 360 300 260 300 250 220 180 150 130 110 90 80