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International Standards






ABMA / ISO 3290 : 2001 (E) (Values in Micron)      
Grade Variation of Ball  Deviation from  Surface  Lot dia.
  Diameter Sperical Form Roughness Variation 
  VDWS max tDW max Ra max VDWL max
G3 0.08 0.08 0.01 0.13
G5 0.13 0.13 0.014 0.25
G10 0.25 0.25 0.02 0.5
G16 0.4 0.4 0.025 0.8
G20 0.5 0.5 0.032 1
G24 0.6 0.6 0.04 1.2
G28 0.7 0.7 0.05 1.4
G40 1 1 0.06 2
G60 1.5 1.5 0.08 3
G100 2.5 2.5 0.1 5
G200 5 5 0.15 10
G500* 12.5 12.5 - 25
G1000* 25 25 - 50
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