7900 single row angular contact ball bearing
7900 single row angular contact ball bearing
Product Details

If you are going to import 7900 bearing in stock or you want to check the price with one China 7900 bearing manufacturer, supplier and factory, please feel free to contact Weinuo Machinery.

Some large size bearings are available with a flange outer ring.

1. Precision

The precision of a spindle bearing does affect the guiding properties as well as lifetime, especially with applications at max. speed.  HTH high precision bearings are manufactured to precision class 4,calss 2 and class 5 (P4, P2 and P5) as well as ABEC 7, ABEC 9 and ABEC 5. 

For special applications, e.g. vacuum pumps, gyroscopes as well as measuring engineering and optical systems, HTH manufactures bearings to the internal tolerance classes HG (high precision) and UP (ultra precision). Apart from the requirements mentioned, the tolerance classes contain additional selection criteria. The relationship between the various standards are explained below.

GB/T30794

ISO

DIN

AFBMA

C

Class 4

P4

ABEC7

B

Class 2

P2

ABEC 9

D

Class 5

P5

ABEC5

2. Contact angle 

The contact angle is formed by a straight line drawn between the points of contact of the balls with the raceways and a plane perpendicular to the bearing axis. Externally applied loads are transmitted from one ring to the other along this line. 

The contact angle is designed into the bearing and changes during operation with the speed, the external forces and the difference in temperature between the inner and the outer ring.

With increasing contact angle:

a, Limiting speed decreases

b, Radial rigidity decreases

c, Axial rigidity increases

HTH manufactures spindle bearings with 15°, 25°, 30° and 40°contact angles. Other contact angles available on request. 

3. Material 

Careful selection of material is a factor when applications require bearings to provide superior hardness and anti-corrosion or heat-resistance. So we always choose standard materials.

Chrome Steel

SpecSymbolChemical  Composition (wt%)
CSiMnPSCrMo
JISSUJ20.95~1.100.15~0.350.50 MAX0.025 MAX0.025 MAX1.30~1.60-
ASTM/AISI/SAEE521000.98~1.100.15~0.350.25~0.450.025 MAX0.025 MAX1.30~1.60-
GBGCr150.95~1.050.15~0.350.20~0.400.027 MAX0.020 MAX1.30~1.65-

4. Lubrication

5. How  HTH to make  heat Treatment for bearings

Heat-treatments consisted of preheating samples at 843 C (1550 F) using a Sybron Thermolyne 30400 furnace, and then austenitizing samples in a Keith furnace at temperatures of 843-1215 C (1550-2220 F); immediately followed by warm high-speed oil quenching at 48.9 C (120 F). Pre-heating was done to ramp the temperature of the samples prior to austenitizing and to prevent thermal shock. 

One heat treatment per steel was carried out with cryogenic quenching at -48.9 C (-120 F) immediately after oil quenching to increase the formation of marten site. The cryogenic quench was prepared by submerging dry ice into ethanol. 

The final step was tempering, it was conducted at temperatures ranging from 135 to 537 C (275-1000 F). 

More information please contact us: tang@fycbearings.com


Dimensions
(mm)

Basic load ratings
(KN)

Limiting speeds
(rpm)

Mass
(kg)

Part No. 

d

D

B

rs min

r1s min

Cr

Cor

  Grease

Oil 

(Approx.) 

HTH

25

42

9

0.3

0.15

7.15

4.95

17,000

22,000

0.05

7905

30

47

9

0.3

0.15

7.55

5.75

14,000

19,000

0.058

7906

35

55

10

0.6

0.3

12

8.85

13,000

17,000

0.088

7907

40

62

12

0.6

0.3

12.7

10.2

11,000

15,000

0.13

7908

45

68

12

0.6

0.3

15.7

12.9

10,000

14,000

0.15

7909

50

72

12

0.6

0.3

16.6

14.5

9,200

12,000

0.157

7910

55

80

13

1

0.6

17.3

16.1

8,400

11,000

0.214

7911

60

85

13

1

0.6

18.1

17.4

7,800

10,000

0.23

7912

65

90

13

1

0.6

18.3

18

7,200

9,600

0.245

7913

70

100

16

1

0.6

26.2

26.2

6,700

9,000

0.397

7914

75

105

16

1

0.6

26.5

27.1

6,300

8,400

0.42

7915

80

110

16

1

0.6

26.9

28

5,900

7,800

0.444

7916

85

120

18

1.1

0.6

36

38

5,500

7,400

0.628

7917

90

125

18

1.1

0.6

36

38

5,200

7,000

0.658

7918

95

130

18

1.1

0.6

37

40.5

5,000

6,600

0.688

7919

100

140

20

1.1

0.6

48

52.5

4,700

6,200

0.934

7920

105

145

20

1.1

0.6

48.5

54.5

4,400

5,900

0.972

7921

110

150

20

1.1

0.6

49.5

56

4,200

5,700

1.01

7922

120

165

22

1.1

0.6

61

69.5

3,900

5,200

1.66

7924

130

180

24

1.5

1

75

87.5

3,600

4,700

1.82

7926

140

190

24

1.5

1

75.5

90

3,300

4,400

1.94

7928

150

210

28

2

1

97.5

117

3,100

4,100

2.96

7930

160

220

28

2

1

98.5

121

2,800

3,800

3.13

7932

170

230

28

2

1

102

129

2,700

3,600

3.29

7934

180

250

33

2

1

131

163

2,500

3,300

4.87

7936

190

260

33

2

1

133

169

2,400

3,200

5.1

7938

200

280

38

2.1

1.1

185

231

2,200

3,000

7.15

7940

220

300

38

2.1

1.1

187

239

2,000

2,700

7.74

7944

240

320

38

2.1

1.1

197

264

1,800

2,400

8.34

7948

260

360

46

2.1

1.1

258

375

1,700

2,200

14

7952

280

380

46

2.1

1.1

261

385

1,500

2,100

14.8

7956

300

420

56

3

1.1

325

520

1,400

1,900

23.7

7960


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