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GRADING CHARTS GRADES AND TOLERANCES - INCHES ABMA Grade  DIN Grade  Deviation from Spherical Form  Lot Diameter Variation Allowable Ball Gage Variation Nominal Ball Diameter Tolerance  Marking Increments  *Max Surface Roughness in Micro-Inches "Ra" 3 - .000003 ±.000003 ±.000003 - .000010 .5 5 - .000005 ±.000005 ±.000005 - .000010 .8 10 Ⅰ .000010 ±.000010 ±.000005 - .000010 1.0 25 Ⅱ .000025 ±.000025 ±.000010 - .000010 2.0 50 Ⅲ .000050 ±.000050 - ±.0002 .000050 3.0 100 Ⅳ .0001 ±.0001 - ±.0005 - 5.0 200 - .0002 ±.0002 - ±.0010 - 8.0 500 - .0005 ±.0005 - ±.0025 - - 1000 Ⅴ .0010 ±.0010 - ±.0050 - - *Maximum suface roughness is an arithmetic average. GRADES AND TOLERANCES - METRIC (Millimeter) DIN Grade  ABMA Grade  Deviation from Spherical Form  Lot Diameter Variation Allowable Ball Gage Variation Nominal Ball Diameter Tolerance  Marking Increments  *Max Surface Roughness in Micro-Inches "Ra" - 3 .000008 ±.00008 ±.0008 - .00025 0.012 - 5 .000013 ±.00013 ±.0013 - .00025 0.020 Ⅰ 10 .000025 ±.00025 ±.0013 - .00025 0.025 Ⅱ 25 .0006 ±.0006 ±.0025 - .00025 0.051 Ⅲ 50 .0012 ±.0012 - ±.0051 .00127 0.076 Ⅳ 100 .0025 ±.0025 - ±.0381 - 0.127 - 200 .0050 ±.0050 - ±.0250 - 0.203 - 500 .0125 ±.0125 - ±.0635 - - Ⅴ 1000 .0250 ±.0250 - ±.1270 - - *Maximum suface roughness is an arithmetic average.

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