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High Precision Ball Screw Support Bearings

High quality bearing steel can control the detrimental oxide impurities that affect the rolling fatigue life, 60° contact angle can bear both axial and radial load or synthetic load,more numbers of rolling element make bearing high rigidity,nylon cage can reduce noise.

Description

Ball screw support bearings performance

1.ZYS precision Ball screw support bearing is a kind of one-direction angular contact thrust ball bearing (60° contact angle) with high accuracy, high speed, high axial rigidity, low friction, long life and transient high/low speed conversion. The bearing is particularly suitable for the ball screw support and similar transmitting components in high-speed precision CNC machine tools. 

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Ball screw support bearings

ZYS precision ball screw support bearings including four series: 7602, 7603, BS, BSS. The standard7602 and 7603 series correspond to Chinese Mechanical standard, with the bore diameters from 12mm to 130mm; BS series are non-standard metric and BSS series are inch series.

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Ball screw support bearings can support larger axial load in one direction and a certain radial load. These bearings are usually arranged in duplex or multiple sets with the same arranging modes as the way of angular contact ball bearings.


2.Sealed ball screw support bearings 

In order to meet the developing trend of smaller machine tool with more compact structure, ZYS developed sealed ball screw support bearings. The seals at both ends of bearing can prevent cutting fluid and metal scrap into the bearing.

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Sealed ball screw support bearings


3.Ball screw support bearings units

ZYS ball screw support bearings units refer to combining matched bearings and relevant 

accessories together into ball screw support components, with simple mounting, convenient use, reliable operation and such features.

According to the different bearings arranging modes, ZYS ball screw support bearing units have three types: BSDU……DF, BSTU……TFT and BSQU……QFC.


4.The preload and axial rigidity of high precision ball screw support bearings

The preload and axial rigidity of high precision ball screw support bearings (Standard Metric)

Bearing designation

ZYS

Preload

Fa0

Axial   rigidity

Ra

Bearing designation

ZYS

Preload

Fa0

Axial   rigidity

Ra

KN

N/μm

KNN/μm

760201TN1

1.4

470

760304TN1

2.9

780

760202TN1

1.4

510

760305TN1

3.3

910

760203TN1

1.7

590

760306TN1

4.3

1070

760204TN1

2.3

700

760307TN1

4.8

1190

760205TN1

2.5

770

760307X3TN1

5.6

1290

760206TN1

2.9

890

760308TN1

5.6

1290

760207TN1

3.3

1020

760309TN1

7.0

1470

760208TN1

4.3

1180

760309X3TN1

7.6

1600

760209TN1

4.5

1240

760310TN1

7.6

1600

760210TN1

4.9

1360

760311TN1

8.8

1720

760211TN1

4.6

1390

760312TN1

10.0

1840

760212TN1

6.5

1620

760313TN1

12.0

2050

760213TN1

7.0

1750

760314TN1

12.0

2100

760214TN1

7.0

1750

760315TN1

14.5

2330

760215TN1

7.6

1880

760316TN1

16.0

2460

760216TN1

8.9

2040

760317TN1

17.5

2530

760217TN1

10.5

2200

760318TN1

18.0

2650

760218TN1

11.0

2270

760319TN1

19.0

2770

760219TN1

12.5

2430

760320TN1

21.5

2960

760220TN1

14.0

2590

760322TN1

29.3

3360

760222TN1

16.4

2800

760324TN1

31.3

3550

760224TN1

20.6

3130

760326TN1

33.7

3800

760226TN1

20.6

3280





5.Tolerances of shaft and housing fit for ball screw support bearings

Tolerances of shaft fit for ball screw support bearings (μm)

Shaft diameter

d(㎜)

From

Up to

10

18

18

30

30

50

50

80

80

120

120

180

180

250

250

315

Tolerance

Upper deviation

0

0

0

0

0

0

0

0

Lower deviation

-8

-9

-11

-13

-15

-18

-20

-23

Cylindricity

t1

2

2.5

2.5

3

4

5

7

8

Flatness

t2

1.2

1.5

1.5

2

2.5

3.5

4.5

6

End face runnout

t3

2

2.5

2.5

3

4

5

7

8

Roughness on surface

Ra

0.4

0.4

0.4

0.4

0.4

0.4

0.8

0.8

 

Tolerances of housing fit for ball screw support bearings (μm)

Housing diameter

D(㎜)

From

Up to

18

30

30

50

50

80

80

120

120

180

180

250

250

315

315

400

Tolerance

Upper deviation

+8

+10

+13

+16

+18

+22

+25

+29

Lower deviation

-5

-6

-6

-6

-7

-7

-7

-7

Cylindricity

t1

2.5

2.5

3

4

5

7

8

9

Flatness

t2

2.5

2.5

3

4

5

7

8

9

End face runnout

t3

4

4

5

6

8

10

12

13

Roughness on surface

Ra

0.8

0.8

0.8

0.8

0.8

0.8

1.6

1.6


6.Comparison table of bearing designations between ZYS and other manufacturers

Bearing types

ZYS

SNFA

FAG

SKF

NSK

GMN

FAFNIR

RHP

Angular contact

ball bearing

718

SEA







719

SEB

B719

719

79

S619

93W1

79

70

EX

B70

70

70

S60

91W1

70

72

E200

B72

72

72

S62

2W1

72

H719

VEB

HS719


BNC19


993WN

S79

H70

VEX

HS70

70CC

BNC10

SH60

991WN

S70
B719-2RZ


HSS719




B70-2RZ


HSS70




B70



SN60

91WO

Cylindrical roller bearing

N1OK


N10K

N10AK

N10KR




NN30K


NN30K

NN30K

NN30KR


2344


2344

2344

TAC20X




2347


2347

2347



70A/DB




BA10X




70B/DB


BA10X


Tapered roller bearing

320


320X

320X





7602

BS200

7602

BSA2

TAC02




7603


7603

BSA3

TAC03


BS


BSB

BSD

TAC


BSS


BDAB

TAC


Luoyang Bearing has been engaged in high precision ball screw support bearings since 1958, and we are known as one of the leading bearing manufacturers and suppliers for our quality products and excellent services. Please rest assured to buy the good products from our factory.

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