ABIS Miniature and Precision Ball Bearings
With bores of 0.6 to 90mm and precision grades to ABEC 7
Inch/Metric Bearing *
Tolerance *
Type *
The radial play of a bearing has considerable influence on its performance. Therefore consideration must be given to the speed, temperature, load, adjacent materials (different coefficients of expansion) and fitting conditions associated with each individual application when selecting the appropriate group. The following notes are given for guidance against the various groups details in the table below:
Service requirements
RADIAL PLAY
Remarks
Miniature Bearings
Standard Metric Bearings
l/D
<10
10
only
10+
-18
18+
-24
24+
-30
30+
-40
40+
-50
0.001
mm
inch
Ref
0.001mm
Small bearing clearance required axially without the use of preload shims or springs.
Low torque not the prime requirement.
High thrust loads will not occur.
TIGHT
0-5
3-8
0-2
1-3
MC1
MC2
0-7
0-9
0-10
1-11
C2
Interference fits must be avoided.
Beware differential expansion.
Careful attention should be paid to any excessive temperature rise in service.
Moderate torque acceptable.
Moderate thrust loads may occur.
MC3 (Std)
8-13
3-5
MC4
8-23
11-25
13-28
15-33
18-36
C3
Minimal torque required.
Or
High thrust load capability.
5-8
MC5
14-29
18-33
20-36
23-41
28-46
30-51
C4
Axial play may require to be controlled by shims or springs.
20-28
8-11
MC6
20-37
25-45
28-48
30-53
40-64
45-73
C5
