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FAFNIR SUPERPRECISION BEARINGS

MM-EX Replacement Bearings For Ex-Cell-O Spindles

Fafnir Bearing Number

Ex-Cell-O Part No.

Preload lbs.

Bore (in.)

O.D. (in.)

Width of Pair (in.)

Maximum Speed (RPM)

MM20EXCR DU FS223 MM30EXCR DU FS223 MM30EXCR DU 5 # MM50EXCR DU FS223 MM50EXCR DU 10 #

20 30 30 50 50

0 0 5 0 10

0.3752/.3750 0.6252/.6250 0.6252/.6250 0.8127/.8125 0.8127/.8125

1.1252/1.1250 1.5002/1.5000 1.5002/1.5000 2.0002/2.0000 2.0002/2.0000

0.6875/.6775 1.0000/9900 1.0000/9900 1.0000/9900 1.0000/9900

65000 35000 25000 30000 18000

MM50EXCR DU 50 # *MM55EXCR DU 10 # MM57EXCR DU FS223 MM57EXCR DU 10 # MM57EXCR DU 50 #

50 55 57 57 57

50 10 0 10 50

0.8127/.8125 0.8127/.8125 1.0627/1.0625 1.0627/1.0625 1.0627/1.0625

2.0002/2.0000 2.0002/2.0000 2.2502/2.2500 2.2502/2.2500 2.2502/2.2500

1.0000/9900 1.0000/9900 1.0000/9900 1.0000/9900 1.0000/9900

5000 22000 30000 15000 5000

MM67EXCR DU FS223 MM67EXCR DU 10 # MM67EXCR DU 30 # MM67EXCR DU 75 # MM90EXCR DU 20 #

67 67 67 67 90

0 10 30 75 20

1.2502/1.2500 1.2502/1.2500 1.2502/1.2500 1.2502/1.2500 1.6252/1.6250

2.4377/2.4375 2.4377/2.4375 2.4377/2.4375 2.4377/2.4375 3.4377/3.4375

1.2500/1.2400 1.2500/1.2400 1.2500/1.2400 1.2500/1.2400 1.6250/1.6150

30000 12500 7500 4500 10000

MM90EXCR DU 100 # MM90EXCR DU 150 # MM90EXCR DU 250 # **MM92EXCR DU 20 # **MM92EXCR DU 100 #

90 90 90 92 92

100 150 250 20 100

1.6252/1.6250 1.6252/1.6250 1.6252/1.6250 1.7502/1.7500 1.7502/1.7500

3.4377/3.4375 3.4377/3.4375 3.4377/3.4375 3.4377/3.4375 3.4377/3.4375

1.6250/1.6150 1.6250/1.6150 1.6250/1.6150 1.6250/1.6150 1.6250/1.6150

4500 2700 900 12000 4500

**MM92EXCR DU 150 # **MM92EXCR DU 250 # MM115EXCR DU 30 # MM115EXCR DU 250 # MM115EXCR DU 350 #

92 92 115 115 115

150 250 30 250 350

1.7502/1.7500 1.7502/1.7500 2.2502/2.2500 2.2502/2.2500 2.2502/2.2500

3.4377/3.4375 3.4377/3.4375 4.7502/4.7500 4.7502/4.7500 4.7502/4.7500

1.6250/1.6150 1.6250/1.6150 2.2500/2.2400 2.2500/2.2400 2.2500/2.2400

2700 900 5000 3600 1800

MM135EXCR DU 20 # MM135EXCR DU 75 # MM155EXCR DU 150 # MM155EXCR DU 300 # MM165EXCR DU 200 # MM165EXCR DU 400 #

135 135 155 155 165 165

20 75 150 300 200 400

1.2502/1.2500 1.2502/1.2500 2.7502/2.7500 2.7502/2.7500 3.5002/3.5000 3.5002/3.5000

2.6877/2.6875 2.6877/2.6875 4.7502/4.7500 4.7502/4.7500 6.3127/6.3125 6.3127/6.3125

1.2500/1.2400 1.2500/1.2400 2.2500/2.2400 2.2500/2.2400 3.0000/2.9900 3.0000/2.9900

8000 4000 4000 1800 2800 1200

  • *

    Four slots in outer ring faces.

** No keyway in bore. FS-223 Zero to negative preload.

Do not interchange with MM-XWO. MM-XWO produced to nominal minus tolerance. MM-EX produced to nominal plus tolerance.

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102800

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