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Buyers Guide



Radial Bearings


Buying Tips: Radial Ball Bearings

The following should be considered while selecting radial ball bearings:
  • Load, radial or thrust or the combination of both
  • Magnitude of the bearing
  • Nature of the ball bearing, whether it is uniform, high shock or light shock
  • Speed of the bearing, constant or variable
What are ABEC and ISO standards?

The ABEC and ISO bearing standards are primarily concerned with bearing tolerances. The Annular Bearing Engineers Committee (ABEC) of the American Bearing Manufacturers Association (ABMA) establishes standards for manufacturing precision ball bearings. These standards are also accepted by (ANSI) American Standardization Institute and by international agreement for the standards developed by the International Standards Organization (ISO).

ABEC and ISO standards do not cover: radial play, raceway curvature, surface finish, material, ball complement, number, size or precision level, retainer type, lubrication, torque, cleanliness at assembly, packaging and other factors that may be essential to the desired bearing performance.

The following ABEC and ISO Chart can assists you in determining the bearing quality necessary for your system.

Table 1. Application Guide
  ABEC Grade
Application 1 3 5 7
Electric Motors   X    
Tape Guides       X
Gyro Gimbals       X
Commercial Gear Trains X X    
Precision Gear Trains     X X
AGMA Q1X Gear Trains       X
Very High Speed Applications       X
Timing Pulley Supports X X    
“No-Slip” Pulley Systems     X X
Chain Drive Systems X      
Bread Board Experiments       X
Computer Disk Drive       X
Laser Aligning Equipment     X X
Hand Adjusted Settings X      
Robotics     X X
Encoder Applications     X X
Office Equipment   X X  
Print Heads   X X  


Table 2. ABEC & ISO Tolerance Chart
ABEC Grade Radial Runout Mean Diameter Tolerance ISO Class
Inner Ring Outer Ring Bore O.D. O.D. Size
1 0.0003 0.0005 +.0000
-.0003
+.0000
-.0003
0-18 mm 0
(Normal)
3 0.0003 0.0004 +.0000
-.0002
+.0000
-.0003
0-30 mm 6
5 0.00015 0.0002 +.0000
-.0002
+.0000
-.0002
0-30 mm 5
7 0.0001 0.00015 +.0000
-.0002
+.0000
-.0002
0-30 mm 4
*All dimensions are in inches



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