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Grades - AFBMA

Grades - AFBMA
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Grades - AFBMA

Product catalog summary
Overview: This document is a technical standard from ANSI/AFBMA, specifically the 1989 revision of the 1983 standard, detailing tolerances for ball bearings. It outlines the allowable variations in diameter, spherical form, and surface roughness for individual balls and lots of balls, both in inch and metric measurements.
Specifications:
  • Ball Grades: The document specifies different grades of balls, each with specific tolerances for diameter variation, deviation from spherical form, and surface roughness.
  • Tolerances for Individual Balls: The tolerances are provided for various grades, with specific values for allowable diameter variation (VDws), deviation from spherical form (∆Rw), and maximum surface roughness (Ra).
  • Tolerances for Lots of Balls: Includes allowable lot diameter variation (VDwt) and nominal ball diameter tolerance, with specific gauge deviations for high and low limits.
Key Parameters:
  • Inch Measurements: Tolerances range from 0.000003 inches for Grade 3 to 0.001 inches for Grade 1000.
  • Metric Measurements: Tolerances range from 0.08 µm for Grade 3 to 25 µm for Grade 1000.
Critical Information:
  • Container Marking: Specific increments are noted for container marking, although some values are marked with an asterisk indicating special conditions or exceptions.
  • Surface Roughness: Maximum surface roughness values are provided, with some grades marked with an asterisk indicating unspecified or special conditions.
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