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.

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.

Metric Range

DIMENSIONS AND SPECIFICATIONS

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

SHAFT AND HOUSING TOLERANCES AND RESULTING FITS

Bearing RefSeal
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
MinMax
MR 16-2825.4028.00+.007
-.005
16.00+.000
-.005
.002.012.00713,0001.501.34
MR 20-3229.3632.00+.010
-.005
20.00+.000
-.005
.002.012.01012,0001.941.91
MR 25-3936.5039.00+.013
-.005
25.00+.000
-.005
.002.012.01010,0002.452.24
MR 32-4642.8546.00+.013
-.005
32.00+.000
-.005
.002.012.0108,0003.634.18
MR 40-5551.8155.00+.013
-.005
40.00+.000
-.005
.002.012.0107,0004.415.37
MR 50-7063.5070.00+.013
-.005
50.00+.000
-.005
.002.012.0105,0006.919.34

Inch Range

DIMENSIONS AND SPECIFICATIONS

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

SHAFT AND HOUSING TOLERANCES AND RESULTING FITS

Bearing Ref 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
MR 500-875 .875 .8750 +.0003 -.0002 .5000 +.0000 -.0002 .0001 .0005 .0003 14,000 230 158
 MR 625-1000 1.000 1.0000 +.0003 -.0002 .6250 +.0000 -.0002 .0001 .0005 .0003 13,000 352 302
MR 750-1250 1.125 1.2500 +.0004 -.0002 .7500 +.0000 -.0002 .0001 .0005 .0004 12,000 440 430
 MR 875-1500 1.312 1.5000 +.0004 -.0002 .8750 +.0000  -.0002 .0001 .0005 .0004 11,000 562 503
 MR 1000-1625 1.437 1.6250 +.0004 -.0002 1.0000 +.0000 -.0002 .0001 .0005 .0004 10,000 688 692
MR 1125-1750 1.562 1.7500 +.0004 -.0002 1.1250 +.0000  -.0002 .0001 .0005 .0004 9,000 814 907
 MR 1250-1875 1.687 1.8750 +.0005 -.0002 1.2500 +.0000  -.0002 .0001 .0005 .0004 8,000 967 1195
 MR 1500-2125 1.937 2.1250 +.0005 -.0002 1.5000 +.0000 -.0002 .0001 .0005 .0004 7,000 1147 1612
 MR 1750-2625 2.312 2.6250 +.0005 -.0002 1.7500 +.0000 -.0002 .0001 .0005 .0004 6,000 2185 2978
 MR 2000-2875 2.562 2.8750 +.0005 -.0002 2.0000 +.0000  -.0002 .0001 .0005 .0004 5,000 2490 3733

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.

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 120°C 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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