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ABIS Miniature and Precision Ball Bearings

With bores of 0.6 to 90mm and precision grades to ABEC 7

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Inch/Metric Bearing
Tolerance:
Desired Bore
Desired Outer Diameter
Material
Type
Closure

Importance of correct fitting of bearings

A bearing can only perform to its full capacity when it is correctly fitted on the shaft and in the housing. Insufficient interference on fitting surfaces could cause bearing rings to creep in a circumferential direction. Once this happens, considerable wear occurs on the fitting surface and both shaft and housing can be damaged. Furthermore, abrasive particles may enter the bearing causing vibration, excessive heat and damage to raceways. It is therefore necessary to provide bearing rings under rotating load with an adequate interference fit to prevent creep. When using thin-type bearings under low load, the bearings should be fastened by a nut. Statically loaded bearings generally do not need to be fitted with an interference fit. Only when subject to a high degree of vibration do both inner and outer rings require fitting with an interference fit.

Fitting of Bearing and Shaft

Condition (Steel Shaft)

Shaft Bore Diameter  Shaft Tolerance Class
Thin-Type Others

Inner ring rotating
load or indeterminate 
load direction

Light load ≤ 0.06C or fluctuating load 

10 ≤ d 18
18 ≤ d ≤ 30
30 ≤ d ≤ 50

h5
h5
h5
js5
js5
js5
Standard load = 0.06 - 0.11C 10 ≤ d ≤ 18
18 ≤ d ≤ 30
30 ≤ d ≤ 50
js5
js5
js5
j5
k5
k5
Outer ring rotating load
Necessary for inner ring turning easily around shaft All bore diameters g6 g6
Unnecessary for inner ring turning easily around shaft All bore diameters h6 h6

Fitting of Bearing and Housing
Condition
(One-Piece Housing)

Axial Directional
Movement of
Outer Ring
Tolerance Class
of
Housing Seats
Thin-Type  Others
Inner ring rotating
load 
Varying loads Easy to move H7 H7
Light or standard loads Easy to move H8 H8
High temperature of inner
ring and shaft
Easy to move G7 G7
Light or standard load 
Precision rotation
As a rule, impossible
to move
K6 K6
Possible to move JS6 J6
Quiet operations Easy to move H6 H6

Indeterminate load
direction

Light or standard load In general, possible to
move
JS7 J7
Standard or heavy load As a rule, impossible to
move
K7 K7
Large shock load Impossible to move M7 M7
Light or fluctuating load Impossible to move
M7 M7
Outer ring rotating
load
Standard or heavy load Impossible to move
N7 N7
Thin-type housing seats
heavy or large shock load 
Impossible to move
P7 P7

 Characteristics of Load and Fitting
 Rotating Ring Load Load Condition Fitting
   

Inner ring
rotating load

Outer ring
static load

Interference fit for
inner ring

Clearance fit for
outer ring

   
   

Outer ring
rotating load

Inner ring
static load

Clearance fit for
inner ring

Interference fit for
outer ring

   
In case of
fluctuating load
direction or
 unbalanced
load
Rotating
or static
Indeterminate
load
direction

Interference fit
for inner
and
outer ring

 

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