ball screw support - ntn snr · ball screw support bearing unit distributed by: bstu designation...

With You

BALL SCREW SUPPORT BEARING UNIT

BSTU

DO

C.I_

BS

TU_A

RG

1.G

Ba

- S

AP

: 35

5862

C

once

ptio

n et

réa

lisat

ion

: Ser

vice

pub

licité

NTN

-SN

R /

Com

&C

ie ©

201

5 /

09 -

Pho

tos:

© P

edro

Stu

dio

Pho

tos

- S

hutt

erst

ock

NTN-SNR ROULEMENTS - 1 rue des usines - 74000 Annecy RCS ANNECY B 325 821 072 - Code APE 2815Z - Code NACE 28.15 www.ntn-snr.com

TesT specificaTions

The newly developed LX seal reduces the generation of heat.

Test conditions:Bearing designation: BsTU3080LLX/Gnp4U/L588

Rotational speed: up to 5,000 min-1

Lubricant: special grease L588

1. TempeRaTURe/RoTaTionaL speed cURve

The LX seal has only a minimal influence on the breakout torque

of the bearing.



2. ToRqUe

BsTU bearings offer a very high rigidity, thanks to the use of a

maximum number of large-diameter balls.


axial thrust load: up to 20 kn

3. BeaRinG RiGidiTy

a spindle ball bearing is constantly subjected to cooling liquids

and metal shavings. after the test, no contamination was detected

on the inside of the BsTU bearing.


Rotational speed: up to 2,200 min-1


dirt particles: diameter: 5 to 75 µm

components: sio2, fe

2o

3, al

2o

3 and others

color of dirt particles: Brown

Test duration: 1 hour

5. seaL

The BsTU bearings are filled with special long-life polyurea-

based grease (L588).

This grease is very effective in reducing standstill wear and

fretting corrosion of the bearing. Ball/plate tests proved the wear-

reducing properties of the grease.

4. GRease

TempeRaTURe incRease

Tem

pera

ture

incr

ease

at

the

bear

ing

inne

r rac

e [ ℃

]

Rotational speed [min-1]

35

30

25

20

15

10

5

0500 1500 2500 3500 55004500

Brea

kout

torq

ue [N

m]

0.20

0.15

0.10

0.05

0.00Unsealed Sealed

Axia

l dev

iatio

n [µ

m]

Axial load [kN]

25

20

15

10

5

00 2 4 6 8 10 12 14 16 18 20 22

Wea

r rat

io

Lithium soap grease NTN special grease L588

1.2

1

0.8

0.6

0.4

0.2

0

Fr

Ball

Plate

Oscillation

BReakoUT ToRqUe

Tem

pera

ture

incr

ease

at

the

bear

ing

inne

r rac

e [ ℃

]


35

30

25

20

15

10

5

0500 1500 2500 3500 55004500

Brea

kout

torq

ue [N

m]

0.20

0.15

0.10

0.05

0.00Unsealed Sealed

Axia

l dev

iatio

n [µ

m]

Axial load [kN]

25

20

15

10

5

00 2 4 6 8 10 12 14 16 18 20 22

Wea

r rat

io


1.2

1

0.8

0.6

0.4

0.2

0

Fr

Ball

Plate

Oscillation

aXiaL RiGidiTyTe

mpe

ratu

re in

crea

se

at th

e be

arin

g in

ner r

ace

[ ℃]


35

30

25

20

15

10

5

0500 1500 2500 3500 55004500

Brea

kout

torq

ue [N

m]

0.20

0.15

0.10

0.05

0.00Unsealed Sealed

Axia

l dev

iatio

n [µ

m]

Axial load [kN]

25

20

15

10

5

00 2 4 6 8 10 12 14 16 18 20 22

Wea

r rat

io


1.2

1

0.8

0.6

0.4

0.2

0

Fr

Ball

Plate

Oscillation

amoUnT of weaR

Tem

pera

ture

incr

ease

at

the

bear

ing

inne

r rac

e [ ℃

]


35

30

25

20

15

10

5

0500 1500 2500 3500 55004500

Brea

kout

torq

ue [N

m]

0.20

0.15

0.10

0.05

0.00Unsealed Sealed

Axia

l dev

iatio

n [µ

m]

Axial load [kN]

25

20

15

10

5

00 2 4 6 8 10 12 14 16 18 20 22

Wea

r rat

io


1.2

1

0.8

0.6

0.4

0.2

0

Fr

Ball

Plate

Oscillation

BALL SCREW SUPPORT BeARING UNIT

distributed by:

BSTU designation

BSTU Table(1)The BSTU series produced by NTN are characterized by the highest basic load rating, which ensures a long service life. In this way, NTN contributes to the protection of the environment. In addition, BSTU bearings are very simple to install.

• Long service life and rigidity • High precision

• Low temperature development • Low frictional torque

Technical characteristics1. HiGHesT Basic Load RaTinGBsTU bearings by nTn feature the highest basic load rating available. nTn

achieved this by optimising the inner bearing geometry. in addition to a larger

ball diameter, BsTU bearings are equipped with a larger quantity of balls.

3. appLicaTion-opTimised GReasea special polyurea-based, long-life grease reduces standstill and vibration

rubbing wear (fretting corrosion).

2. LiGHT conTacT-Type seaL• Optimum sealing effect

• Lowest frictional torque

The sealing lip of the LX seal represents the optimum solution in regard to sealing

effect and frictional torque. BsTU bearings by nTn are equipped with these seals

on both sides of the bearing.

as an option, BsTU bearings are available with service lubrication openings and a groove in the outer race.

BsTU bearings are also available as paired sets (suffix: d2).

4. simpLe moUnTinG pRocessBsTU bearings can be simply bolted to the housing, thanks to the pre-drilled

through holes.

Dynamically equivalent loadPa =XFr + YFa

Statically equivalent loadPor =Fa + 3.98Fr

Fa/Fr Fa/Fr

X Y1.902.17 0.55

X Y0.92 1

ee

e

Fitting of modification partsShaft Housing

h5 H6

Series Bore diameter Outside diameter SealLLX: NTN special seal

Preload Accuracy

BSTU 30 80 LLX

(No code):Single bearing type D2:Double bearing type

GNP4UP42U

GreaseL588: Special polyurea grease

L588

t

60°PD d

r

r

B

d3

d＜60

daDa d1 d2

d4

t

d≧60

BSTU2068

BSTU2575

BSTU3080

BSTU30100

BSTU40100

BSTU40115

BSTU50115

BSTU90190

BSTU100200

Ø20

Ø25

Ø30

Ø30

Ø40

Ø40

Ø50

Ø90

Ø100

0

0

0

0

0

0

0

0

0

-0.005

-0.005

-0.005

-0.005

-0.005

-0.005

-0.005

-0.008

-0.008

Ø68

Ø75

Ø80

Ø100

Ø100

Ø115

Ø115

Ø190

Ø200

0

0

0

0

0

0

0

0

0

4X90°("D2": 8x45°)

4X90°("D2": 8x45°)

6X60°("D2": 12x30°)

4X90°("D2": 8x45°)

12X30°("D2": 12x30°)

6X60°("D2": 12x30°)

8X45°(d4=18,t=10.6)(3)(4)

8X45°(d4=18,t=10.6)(3)(4)

8X45°(3)

-0.01

-0.01

-0.01

-0.01

-0.01

-0.01

-0.01

-0.015

-0.015

28

28

28

38

34

46

34

55

55

0

0

0

0

0

0

0

0

0

-0.25

-0.25

-0.25

-0.25

-0.25

-0.25

-0.25

-0.25

-0.25

30.1

36.1

41.1

47.1

54.1

61.1

68.1

116

128

43

49

54

65

68.9

80.2

82.9

139

151

0.6

0.6

0.6

0.6

0.6

0.6

0.6

0.6

0.6

53

58

63

80

80

94

94

165

175

6.8

6.8

6.8

8.8

8.8

8.8

8.8

11

11

42

48

53

64

68

80

82

137

150

26

32

37

39

49

52

62

104

116

M6

M6

M6

M8

M8

M8

M8

M10

M10

31

34

36.5

73.5

52

89

57

158

160

48

58

68.5

121

106

167

135

415

435

2100

2400

2700

4800

3200

5800

3800

8200

8800

6000

5000

4500

4000

3500

3200

2800

1700

1500

0.6

0.72

0.78

1.71

1.46

2.57

1.87

7.95

8.47

0.2

0.3

0.3

0.8

0.4

1.1

0.5

1.5

1.7

675

790

900

1040

1050

1250

1300

2010

2130

150

230

315

495

780

1190

1080

4600

5800

0.25

0.45

0.68

1.99

2.16

5.52

5.06

60.0

83.8

4

4

4

4

4

4

4

5

5

2

2

2.5

2.5

2.5

2.5

2.5

3

3

d D B d1 d2r

min.P d3 dyn. Ca stat. CoaDa

max.da

min.Quantity

X tµm

max.µm

max.

P4U P42U

N min-1 kg Nm N/µm Nm/mrad kg・cm2Screws( 5)

Dimensions(mm)

Axial basic load rating values

(kN)

Screwsand

atachment holes

Mountingdimensions

(mm)

Bearingpreload

(GN)

Limit valueof rotational

speed(Grease)

Weight

Bearingfrictionmoment

( 1)

Axialbearingrigidity

Rigidityagainsttilting

Massmomentof inertia

( 2 )

Axial runout of the innerrace lateral surface in relation to

the inner race track, SiaBearingdesignation

Mounting dimensionsBearing dimensions

(1) Reference value. (2) Mass moment of inertia of the inner race. (3) For these installation sizes there are no paired versions (D2) available.(4) Attachment holes have counter bores based on DIN 974-1. (5) Screws are based on DIN EN ISO 4762 10.9. Please note screws are not included in the packages of bearings.



Fa/Fr Fa/Fr

X Y1.902.17 0.55

X Y0.92 1

ee

e


h5 H6


Preload Accuracy

BSTU 30 80 LLX


GNP4UP42U


L588

t

60°PD d

r

r

B

d3

d＜60

daDa d1 d2

d4

t

d≧60

BSTU2068

BSTU2575

BSTU3080

BSTU30100

BSTU40100

BSTU40115

BSTU50115

BSTU90190

BSTU100200

Ø20

Ø25

Ø30

Ø30

Ø40

Ø40

Ø50

Ø90

Ø100

0

0

0

0

0

0

0

0

0

-0.005

-0.005

-0.005

-0.005

-0.005

-0.005

-0.005

-0.008

-0.008

Ø68

Ø75

Ø80

Ø100

Ø100

Ø115

Ø115

Ø190

Ø200

0

0

0

0

0

0

0

0

0

4X90°("D2": 8x45°)

4X90°("D2": 8x45°)

6X60°("D2": 12x30°)

4X90°("D2": 8x45°)

12X30°("D2": 12x30°)

6X60°("D2": 12x30°)

8X45°(d4=18,t=10.6)(3)(4)

8X45°(d4=18,t=10.6)(3)(4)

8X45°(3)

-0.01

-0.01

-0.01

-0.01

-0.01

-0.01

-0.01

-0.015

-0.015

28

28

28

38

34

46

34

55

55

0

0

0

0

0

0

0

0

0

-0.25

-0.25

-0.25

-0.25

-0.25

-0.25

-0.25

-0.25

-0.25

30.1

36.1

41.1

47.1

54.1

61.1

68.1

116

128

43

49

54

65

68.9

80.2

82.9

139

151

0.6

0.6

0.6

0.6

0.6

0.6

0.6

0.6

0.6

53

58

63

80

80

94

94

165

175

6.8

6.8

6.8

8.8

8.8

8.8

8.8

11

11

42

48

53

64

68

80

82

137

150

26

32

37

39

49

52

62

104

116

M6

M6

M6

M8

M8

M8

M8

M10

M10

31

34

36.5

73.5

52

89

57

158

160

48

58

68.5

121

106

167

135

415

435

2100

2400

2700

4800

3200

5800

3800

8200

8800

6000

5000

4500

4000

3500

3200

2800

1700

1500

0.6

0.72

0.78

1.71

1.46

2.57

1.87

7.95

8.47

0.2

0.3

0.3

0.8

0.4

1.1

0.5

1.5

1.7

675

790

900

1040

1050

1250

1300

2010

2130

150

230

315

495

780

1190

1080

4600

5800

0.25

0.45

0.68

1.99

2.16

5.52

5.06

60.0

83.8

4

4

4

4

4

4

4

5

5

2

2

2.5

2.5

2.5

2.5

2.5

3

3

d D B d1 d2r


max.da

min.Quantity

X tµm

max.µm

max.

P4U P42U

N min-1 kg Nm N/µm Nm/mrad kg・cm2Screws( 5)

Dimensions(mm)


(kN)

Screwsand

atachment holes

Mountingdimensions

(mm)

Bearingpreload

(GN)


speed(Grease)

Weight


( 1)




( 2 )







Fa/Fr Fa/Fr

X Y1.902.17 0.55

X Y0.92 1

ee

e


h5 H6


Preload Accuracy

BSTU 30 80 LLX


GNP4UP42U


L588

t

60°PD d

r

r

B

d3

d＜60

daDa d1 d2

d4

t

d≧60

BSTU2068

BSTU2575

BSTU3080

BSTU30100

BSTU40100

BSTU40115

BSTU50115

BSTU90190

BSTU100200

Ø20

Ø25

Ø30

Ø30

Ø40

Ø40

Ø50

Ø90

Ø100

0

0

0

0

0

0

0

0

0

-0.005

-0.005

-0.005

-0.005

-0.005

-0.005

-0.005

-0.008

-0.008

Ø68

Ø75

Ø80

Ø100

Ø100

Ø115

Ø115

Ø190

Ø200

0

0

0

0

0

0

0

0

0

4X90°("D2": 8x45°)

4X90°("D2": 8x45°)

6X60°("D2": 12x30°)

4X90°("D2": 8x45°)

12X30°("D2": 12x30°)

6X60°("D2": 12x30°)

8X45°(d4=18,t=10.6)(3)(4)

8X45°(d4=18,t=10.6)(3)(4)

8X45°(3)

-0.01

-0.01

-0.01

-0.01

-0.01

-0.01

-0.01

-0.015

-0.015

28

28

28

38

34

46

34

55

55

0

0

0

0

0

0

0

0

0

-0.25

-0.25

-0.25

-0.25

-0.25

-0.25

-0.25

-0.25

-0.25

30.1

36.1

41.1

47.1

54.1

61.1

68.1

116

128

43

49

54

65

68.9

80.2

82.9

139

151

0.6

0.6

0.6

0.6

0.6

0.6

0.6

0.6

0.6

53

58

63

80

80

94

94

165

175

6.8

6.8

6.8

8.8

8.8

8.8

8.8

11

11

42

48

53

64

68

80

82

137

150

26

32

37

39

49

52

62

104

116

M6

M6

M6

M8

M8

M8

M8

M10

M10

31

34

36.5

73.5

52

89

57

158

160

48

58

68.5

121

106

167

135

415

435

2100

2400

2700

4800

3200

5800

3800

8200

8800

6000

5000

4500

4000

3500

3200

2800

1700

1500

0.6

0.72

0.78

1.71

1.46

2.57

1.87

7.95

8.47

0.2

0.3

0.3

0.8

0.4

1.1

0.5

1.5

1.7

675

790

900

1040

1050

1250

1300

2010

2130

150

230

315

495

780

1190

1080

4600

5800

0.25

0.45

0.68

1.99

2.16

5.52

5.06

60.0

83.8

4

4

4

4

4

4

4

5

5

2

2

2.5

2.5

2.5

2.5

2.5

3

3

d D B d1 d2r


max.da

min.Quantity

X tµm

max.µm

max.

P4U P42U

N min-1 kg Nm N/µm Nm/mrad kg・cm2Screws(5)

Dimensions(mm)


(kN)

Screwsand

atachment holes

Mountingdimensions

(mm)

Bearingpreload

(GN)


speed(Grease)

Weight


( 1)




( 2 )





Low-friction contact

labyrinth seal (LX)

Bearing inner race

as an option, BsTU bearings are available with service lubrication openings and a groove in the outer race.

BsTU bearings are also available as paired sets (suffix: d2).

ball screw support - ntn snr · ball screw support bearing unit distributed by: bstu designation...

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