Rotolin Type MRF

Type MRFflanged preloaded general-purpose bearings for rotary motion only

The MRF 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 acceptable. “MRF” type bearings are fitted with nitrile rubber wiper seals. The retainer is held between two flat retaining rings which also back up the seals.

ENGINEERING DATA
Series “MRF” 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 RefShaft dia
B
Bearing dia
D
L+.00
 -.13
CSeal dia
A
FW
MRF16-28162829.002125.41.63
MRF20-32203234.002429.361.63
MRF25-39253938.002636.501.63
MRF32-46324649.003742.852.03
MRF40-55405557.004351.012.03
MRF50-70507072.005863.502.03

SHAFT AND HOUSING TOLERANCES AND RESULTING FITS

Bearing RefFDHousing Dh*Shaft
Bs
Preload Interference Fit ‡PSize Cap ScrewEccentricity O.D. to BoreMax
R.P.M.
Basic Capacity KNStatic Capacity KN
MinMax
 MRF16-2855.5628.00+.007 -.00516.00+.000-.005.002.012465mm
3-OFF
.00713,0001.571.34
 MRF20-3260.3232.00+.010 -.00520.00+.000 -.005515mm
3-OFF
.01012,0001.941.91
 MRF25-3964.3039.00+.013 -.00525.00+.000 -.005555mm
3-OFF
.01010,0002.452.24
 MRF32-4673.0246.00+.013 -.00532.00+.000 -.005645mm
3-OFF
.0108,0003.634.18
 MRF40-5587.3155.00+.013 -.00540.00+.000 -.005755mm
3-OFF
.0107,0004.415.37
 MRF50-70104.0070.00+.013 -.00550.00+.000 -.005955mm
4-OFF
.0105,0006.919.34

Inch Range

DIMENSIONS AND SPECIFICATIONS

Bearing RefShaft dia
B
Bearing O.D.
D
L+.000
-.005
CSeal dia
A
FW
MRF500-875.5000.8750.937.718.875.048
MRF625-1000.62501.00001.125.8121.000.064
MRF750-1250.75001.25001.312.9371.125.064
MRF875-1500.87501.50001.5001.0621.312.064
MRF1000-16251.00001.62501.7501.3121.437.064
MRF1125-17501.12501.75002.0001.5621.562.064
MRF1250-18751.25001.87502.2501.8121.687.064
MRF1500-21251.50002.12502.5001.9371.937.080
MRF1750-26251.75002.62502.8752.3122.312.080
MRF2000-28752.00002.87503.1872.6252.562.080

SHAFT AND HOUSING TOLERANCES AND RESULTING FITS

Bearing Ref FD Housing
Dh*
Shaft
Bs
Preload
Interference Fit‡
P Size Cap Screw Eccentricity
O.D. to Bore
Max
R.P.M.
Basic Capacity Ibf Static Capacity Ibf
Min Max
 MRF500-875 1.812 .875 +.0003 -.0002 .5000 +.0000
-.0002
.0001 .0005 1.500 3 BA
3-OFF
.0003 14,000 230 158
 MRF625-1000 2.187 1.0000 +.0003 -.0002 .6250 +.0000
-.0002
1.812 2 BA
3-OFF
.0003 13,000 352 302
 MRF750-1250 2.375 1.2500 +.0004 -.0002 .7500 +.0000
-.0002
2.000 2 BA
3-OFF
.0004 12,000 440 430
 MRF875-1500 2.531 1.5000 +.0004 -.0002 .8750 +.0000
-.0002
2.187 2 BA
3-OFF
.0004 11,000 562 503
MRF1000-1625  2.687 1.6250 +.0004 -.0002 1.0000 +.0000
-.0002
2.312 2 BA
3-OFF
.0004 10,000 688 692
 MRF1125-1750 2.875 1.7500 +.0004 -.0002 1.1250 +.0000
-.0002
2.531 2 BA
3-OFF
.0004 9,000 814 907
 MRF1250-1875 3.000 1.8750 +.0005 -.0002 1.2500 +.0000
-.0002
2.656 2 BA
3-OFF
.0004 8,000 967 1195
 MRF1500-2125 3.437 2.1250 +.0005 -.0002 1.5000 +.0000
-.0002
2.968 2 BA
3-OFF
.0004 7,000 1147 1612
 MRF1750-2625 3.937 2.6250 +.0005 -.0002 1.7500 +.0000
-.0002
3.468 2 BA
4-OFF
.0004 6,000 2185 2978
 MRF2000-2875 4.093 2.8750 +.0005 -.0002 2.0000 +.0000
-.0002
3.178 2 BA
4-OFF
.0004 5,000 2490 3733

Bearing reference indicates bearing type, shaft diameter, outside diameter.
Larger, heavy duty and special types are available. Please contact us to discuss your requirements.

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