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FAFNIR SUPERPRECISION BEARINGS

Tolerance

Tolerance

+.0000"

+.0000"

+.0m

+.0m

to minus

to minus

Medium MM300K Series Deep Groove Conrad

Superprecision MM: Superprecision bearings are manufactured to a ABEC-7 (ISO P4) tolerance class.

K Construction: This design incorporates two full shoulders on both the inner and outer rings. The complement of balls are separated by a two-piece cage.

To specify a ceramic hybrid bearing, add “C” to the part number, after the prefix that specifies precision type.

Bearing

Outside

Number

Bore

Diameter

in.

mm

in.

m

in.

mm

in.

m

MM305K-CR

0.9843

25

2.0

5

2.4409

62

3.0

7

MM306K-CR

1.1811

30

2.0

5

2.8346

72

3.0

7

MM307K-CR

1.378

35

2.5

6

3.1496

80

3.0

7

MM308K-CR

1.5748

40

2.5

6

3.5433

90

3.0

8

MM309K-CR

1.7717

45

2.5

6

3.9370

100

3.0

8

MM310K-CR

1.9685

50

2.5

6

4.3307

110

3.0

8

MM311K-CR

2.1654

55

3.0

7

4.7244

120

3.0

8

MM312K-CR

2.3622

60

3.0

7

5.1181

130

3.5

9

MM313K-CR

2.5591

65

3.0

7

5.5118

140

3.5

9

MM314K-CR

2.7559

70

3.0

7

5.9055

150

3.5

9

DIMENSIONS – TOLERANCES All inch tolerance in .0001 units

Two piece inner ring-piloted composition cage is standard. Check for availability. ** ABMA std. 20 (ras max).

78

d

D

C

in.

mm

in. m

in.

mm

Qty.

(Dia.)in.

0.6693

17

47

130

0.039

1

7

1532

0.7480

19

47

130

0.039

1

7

1732

0.8268

21

47

130

0.059

1.5

7

9 16

0.9055

23

47

130

0.059

1.5

8

5 8

0.9843

25

47

130

0.059

1.5

8

1116

1.0630

27

47

130

0.059

1.5

8

3 4

1.1417

29

59

150

0.079

2

8

1316

1.2205

31

59

150

0.079

2

8

7 8

1.2992

33

59

150

0.079

2

8

1516

1.3780

35

59

150

0.079

2

8

1

Tolerance

Bearing Corner

+.0000"

will Clear **

Maximum

Ball

Fillet Radius

Complement

Width

+.0m to minus

102800

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