Buying Tips: Radial Ball Bearings

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Types of Radial Bearings	Preload Information	Buying Tips
Lubrication Information	Research Papers	Trade Leads
How Radial Bearing Works	Load Glossary	Radial Bearings Suppliers

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
ABEC Grade	Inner Ring	Outer Ring	Bore	O.D.	O.D. Size	ISO Class
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