ROTOLIN Type MR

PRELOADED BEARINGS FOR ROTARY MOTION ONLY
The MR Series ball bearings are designed and manufactured for those applications where purely radial loads must be supported in a PRELOADED condition. They are ideally adapted to those applications where the necessary clearance in needle and roller bearings is not desirable. "MR" type bearings are fitted with nitrile rubber wiper seals. The retainer is held between two flat retaining rings which also back up the seals.

DIMENSIONS AND SPECIFICATIONS

METRIC RANGE (Dimensions in mm)

Bearing Ref

B
Shaft Dia

D
Bearing O.D.

L +.00
-.13

MR 16-28

16

28

29.00

MR 20-32

20

32

34.00

MR 25-39

25

39

38.00

MR 32-46

32

46

49.00

MR 40-55

40

55

57.00

MR 50-70

50

70

72.00

INCH RANGE (Dimensions in inches)

Bearing Ref

B
Shaft Dia

D
Bearing O.D.

L+.000
 -.005

MR 500-875

.5000

.8750

.937

MR 625-1000

.6250

1.0000

1.125

MR 750-1250

.7500

1.2500

1.312

MR 875-1500

.8750

1.5000

1.500

MR 1000-1625

1.0000

1.6250

1.750

MR 1125-1750

1.1250

1.7500

2.000

MR 1250-1875

1.2500

1.8750

2.250

MR 1500-2125

1.5000

2.1250

2.500

MR 1750-2625

1.7500

2.6250

2.875

MR 2000-2875

2.0000

2.8750

3.187

Bearing reference indicates bearing type, shaft diameter and outside diameter.

Between Shaft, Balls and Outer Sleeve I.D.

Larger, heavy duty and special types are available.
Please contact us to discuss your requirements

*CAUTION: Excessive press fits may affect preload. If in doubt please contact us for alternative mounting methods.

Type MR Engineering Data

Series "MR" bearings supporting pure radial loads must be used with an interference fit between the balls and the shaft. In such applications, the shaft must be made to the dimensions and tolerances given below. The outer races and balls are of 535 A99 steel. Shafts should be hardened to at least 60 HRC and ground to at least 0.25nm.

SHAFT AND HOUSING TOLERANCES AND RESULTING FITS

 

Seal
O.D.
A

Housing
 Dh*

Shaft
Bs

Pre Load Interference Fit

Eccentricity
O.D.
 to Bore

Maximum
R.P.M.

Basic Capacity
KN

Static Capacity
KN

Min

Max

25.40

28.00

+.007
 -.005

16.00

+.000
-.005

.002

.012

.007

13,000

1.50

1.34

29.36

32.00

+.010
 -.005

20.00

+.000
 -.005

.002

.012

.010

12,000

1.94

1.91

36.50

39.00

+.013
 -.005

25.00

+.000
 -.005

.002

.012

.010

10,000

2.45

2.24

42.85

46.00

+.013
 -.005

32.00

+.000
 -.005

.002

.012

.010

8,000

3.63

4.18

51.81

55.00

+.013
 -.005

40.00

+.000
 -.005

.002

.012

.010

7,000

4.41

5.37

63.50

70.00

+.013
 -.005

50.00

+.000
 -.005

.002

.012

.010

5,000

6.91

9.34

 

 

 

 

 

 

 

 

 

 

Seal
O.D.
A

Housing
Dh*

Shaft
Bs

Preload Interference Fit

Eccentricity
O.D
to Bore

Maximum
RPM

Basic
Capacity
Lbf

Static
Capacity
lbf

Min

Max

.875

.8750

+.0003
-.0002

.5000

+.0000
-.0002

.0001

.0005

.0003

14,000

230

158

1.000

1.0000

+.0003
-.0002

.6250

+.0000
 -.0002

.0001

.0005

.0003

13,000

352

302

1.125

1.2500

+.0004
 -.0002

.7500

+.0000
 -.0002

.0001

.0005

.0004

12,000

440

430

1.312

1.5000

+.0004
 -.0002

.8750

+.0000
 -.0002

.0001

.0005

.0004

11,000

562

503

1.437

1.6250

+.0004
 -.0002

1.0000

+.0000
 -.0002

.0001

.0005

.0004

10,000

688

692

1.562

1.7500

+.0004
 -.0002

1.1250

+.0000
 -.0002

.0001

.0005

.0004

9,000

814

907

1.687

1.8750

+.0005
 -.0002

1.2500

+.0000
 -.0002

.0001

.0005

.0004

8,000

967

1195

1.937

2.1250

+.0005
 -.0002

1.5000

+.0000
 -.0002

.0001

.0005

.0004

7,000

1147

1612

2.312

2.6250

+.0005
 -.0002

1.7500

+.0000
 -.0002

.0001

.0005

.0004

6,000

2185

2978

2.562

2.8750

+.0005
 -.0002

2.0000

+.0000
 -.0002

.0001

.0005

.0004

5,000

2490

3733

 

 

 

 

 

 

 

 

Lubrication and Temperature Requirements
All bearings are supplied in rust preventative oil and should be cleaned and lubricated before use. Good quality medium oils and light ball bearing greases have the advantage of greater surface cohesion. High grade light oil will allow a higher operating speed and greater sensitivity to movement. Working temperatures under maximum load conditions should not exceed 120C although the bearings can operate safely at slightly higher temperatures and under decreased load conditions, with special lubricants. For continuous high temperature operation, suitable grades of silicone grease should be used.

 

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