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 Ref | Shaft dia B | Bearing dia D | L+.00 -.13 | C | Seal dia A | FW |
| MRF16-28 | 16 | 28 | 29.00 | 21 | 25.4 | 1.63 |
| MRF20-32 | 20 | 32 | 34.00 | 24 | 29.36 | 1.63 |
| MRF25-39 | 25 | 39 | 38.00 | 26 | 36.50 | 1.63 |
| MRF32-46 | 32 | 46 | 49.00 | 37 | 42.85 | 2.03 |
| MRF40-55 | 40 | 55 | 57.00 | 43 | 51.01 | 2.03 |
| MRF50-70 | 50 | 70 | 72.00 | 58 | 63.50 | 2.03 |
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 KN | Static Capacity KN | |||
| Min | Max | ||||||||||||
| MRF16-28 | 55.56 | 28.00 | +.007 -.005 | 16.00 | +.000-.005 | .002 | .012 | 46 | 5mm 3-OFF | .007 | 13,000 | 1.57 | 1.34 |
| MRF20-32 | 60.32 | 32.00 | +.010 -.005 | 20.00 | +.000 -.005 | 51 | 5mm 3-OFF | .010 | 12,000 | 1.94 | 1.91 | ||
| MRF25-39 | 64.30 | 39.00 | +.013 -.005 | 25.00 | +.000 -.005 | 55 | 5mm 3-OFF | .010 | 10,000 | 2.45 | 2.24 | ||
| MRF32-46 | 73.02 | 46.00 | +.013 -.005 | 32.00 | +.000 -.005 | 64 | 5mm 3-OFF | .010 | 8,000 | 3.63 | 4.18 | ||
| MRF40-55 | 87.31 | 55.00 | +.013 -.005 | 40.00 | +.000 -.005 | 75 | 5mm 3-OFF | .010 | 7,000 | 4.41 | 5.37 | ||
| MRF50-70 | 104.00 | 70.00 | +.013 -.005 | 50.00 | +.000 -.005 | 95 | 5mm 4-OFF | .010 | 5,000 | 6.91 | 9.34 | ||
Inch Range
DIMENSIONS AND SPECIFICATIONS
| Bearing Ref | Shaft dia B | Bearing O.D. D | L+.000 -.005 | C | Seal dia A | FW |
| MRF500-875 | .5000 | .8750 | .937 | .718 | .875 | .048 |
| MRF625-1000 | .6250 | 1.0000 | 1.125 | .812 | 1.000 | .064 |
| MRF750-1250 | .7500 | 1.2500 | 1.312 | .937 | 1.125 | .064 |
| MRF875-1500 | .8750 | 1.5000 | 1.500 | 1.062 | 1.312 | .064 |
| MRF1000-1625 | 1.0000 | 1.6250 | 1.750 | 1.312 | 1.437 | .064 |
| MRF1125-1750 | 1.1250 | 1.7500 | 2.000 | 1.562 | 1.562 | .064 |
| MRF1250-1875 | 1.2500 | 1.8750 | 2.250 | 1.812 | 1.687 | .064 |
| MRF1500-2125 | 1.5000 | 2.1250 | 2.500 | 1.937 | 1.937 | .080 |
| MRF1750-2625 | 1.7500 | 2.6250 | 2.875 | 2.312 | 2.312 | .080 |
| MRF2000-2875 | 2.0000 | 2.8750 | 3.187 | 2.625 | 2.562 | .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.