GoBearings.com
A comprehensive engineers' reference source for radial ball bearings and thrust ball bearing

 


Dynaroll
  RADIAL AND AXIAL PLAY  

Bearings are assembled with a slight amount of looseness between the balls and the raceways. This allows the bearing to rotate smoothly but also affects the performance of the bearing in a given application. This looseness can be split into two components - radial and axial play.

RADIAL PLAY is the maximum displacement that one bearing ring can be displaced relative to the other ring in a direction perpendicular to the axis of rotation of the bearing.


       Radial play = ∆r

AXIAL PLAY, or end play, is the maximum relative displacement of the bearing rings, in a direction parallel to the axis of rotation.


       Axial play = ∆a


Radial and axial play are interdependent and are determined during the manufacture of the bearing. Typically, radial play is a purchasing specification.


Standard radial play ranges and applications

Dimensions in .0001 inch (.001 mm)
DYNAROLL CODE
DESCRIPTION
RADIAL PLAY RANGE
APPLICATION
MIN
MAX
MC2
Tight
1  (3)
3  (8)
Low backlash gear systems with predominantly radial loading.
MC3
Standard
2  (5)
4  (10)
Low Speed electric motors.
MC4
Standard
3  (8)
5  (13)
Gears, belt drives, tape guides, synchros, servos.
MC5
Loose
5  (13)
8  (20)
High speed electric motors, tape guides, radial and axial loading.

Note that the final radial play after assembly is the important operating condition, therefore, compensation for interference must be made in the bearing specification. See section on mounting and fitting.

Contact Dynaroll directly for information on non-standard radial play ranges.

FORMULAE FOR RADIAL PLAY AND AXIAL PLAY:



RADIAL PLAY VS. AXIAL PLAY FOR DIFFERENT BALL SIZES (fi = fo = 0.56)
0.007 
(.175) 
0.006 
(.15) 
0.005 
(.125) 
0.004 
(.1) 
0.003 
(.075) 
0.002 
(.05) 
0.001 
(.025) 

BALL SIZE  Inches (mm)
1/8 (3.175)
.0937 (2.381)
.0787 (2.000)
1/16 (1.588)
.0472 (1.200)
.0394 (1.000)
.0315 (.800)
.0236 (.600)
  0.0002
(.005)
0.0003
(.0075)
0.0004
(.01)
0.0005
(.0125)
0.0006
(.015)
0.0007
(.0175)
0.0008
(.02)
RADIAL PLAY Inches (mm)
Note that axial play is 6-10 times radial play, depending on bearing ball size.






Bearing Overview || Materials || Cages and Retainers || Shields and Seals || Bearing Geometry || Abec Tolerance
Lubrication || Load Rating and Lifetime || Bearing Failure || Noise || Torque || Mounting and Fitting
Preload || Bearing Handling || Adhesive Practices || Assembly Characteristics || Specify a Bearing || News

Dynaroll Copyright 2005