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ABMA Definitions Grade: A specific combination of dimensional form and surface roughness tolerance. A ball grade is designated by a grade number. Deviation from Spherical Form: Determined by rotation of the ball against a linear transducer with less than 4 grams gage force. The resulting polar chart is interpreted using the minimum circumscribed circle method (MCC) per ABMA std. 10. Lot Diameter Variation: The difference between the mean diameter of the largest ball and that of the smallest ball in the lot. Ball Diameter Variation: The difference between the largest and the smallest actual single diameter of one ball. Ball Gage: The prescribed small amount by which the lot mean diameter should differ form nominal diameter, this amount being one of an established series of amounts. A ball gage, in combination with the ball grade and nominal ball diameter should be considered as the most exact ball size specification to be used by a customer for ordering purposes. Nominal Ball Diameter: The diameter value that is used for the purpose of general identification of a ball size, e.g. 1/4", 6mm, etc. Nominal Ball Diameter Tolerance: The maximum allowable deviation of any ball by a specific indenting shape. Specific Diameter: The mount by which the lot mean diameter differs from the nominal diameter, accurate to the container marking increment for that grade.  The specific diameter should be marked on the unit container. Container Marking Increment: The standard unit steps in micrometers or in microinches, used to express the specific diameter. Hardness: The measure of resistance to penetration of the ball surface or truncated flat of the ball by a specific indenting shape. Surface Roughness: Surface roughness consist of all those irregularities which form surface relief and which are conventionally defined within the area where deviations of form and waviness are eliminated. Determined by a stylus type instrument with the ball rotating.  Compliance with Ra limits specific in ABMA Std. 10. Waviness: The more widely spaced circumferential component of surface texture. Grade and Tolerance - Inches Grade Size Range Deviation from Spherical Form Lot Diameter Variation Allowable Ball Gage Variation Nominal Ball Diameter Tolerance Marking Increments Maximum Surface Roughness 1 in Micro inches "Ra" 3 .006 - 2" 0.000003 ±0.000003 ±0.00003 - 0.00001 0.5 5 .006 - 6" 0.000005 ±0.000005 ±0.00005 - 0.00001 0.8 10 .006 - 10" 0.000010 ±0.000010 ±0.00005 - 0.00001 1.0 16 .006 - 10" 0.000016 ±0.000032 ±0.00005 - 0.00001 1.0 25 .006 - 10" 0.000025  ±0.000025 ±0.00010 - 0.00001 2.0 48 .006 - 10" 0.000048 ±0.000048 - ±0.0002 0.00005 3.0 50 .006 - 10" 0.00005 ±0.000050 - ±0.0002 0.00005 3.0 100 .006 - 10" 0.0001 ±0.0001 - ±0.0005 - 5.0 200 .006 - 10" 0.0002 ±0.0002 - ±0.001 - 8.0 1000 .006 - 10" 0.001 ±0.001 - ±0.005 - -                 Grade and Tolerance - Metric (Millimeter) ABMA Grade Deviation from Spherical Form Lot Diameter Variation Allowable Ball Gage Variation Nominal Ball Diameter Tolerance Marking Increments Maximum Surface Roughness1 in Micro inches "Ra" 3 0.0008 ±0.00008 ±0.0008 - 0.00025 0.012 5 0.00013  ±0.00013 ±0.0013 - 0.00025 0.02 10 0.00025 ±0.00025 ±0.0013 - 0.00025 0.025 16 0.00040 ±0.0008 ±0.0013 - 0.00025 0.025 25 0.0006 ±0.0006 ±0.0025 - 0.00025 0.051 48 0.0012 ±0.0024 - ±0.0051 0.00125 0.080 50 0.0012 ±0.0012 - ±0.0051 0.00127 0.076 100 0.0025 ±0.0025 - ±0.0381 - 0.127 200 0.005 ±0.005 - ±0.025 - 0.203 1000 0.025 ±0.025 - ±0.127 - -     Plastic Sheet, Rod, Tube, Bar Stock, Balls, Discs Selections Contact K-mac Plastics 3M Scotchcal UV Resistant Film 3M LCD Film Abs Bar Stock ABS Rod ABS Sheet General Purpose Kydex® FR Acetal ESD Anti Static Rod Acetal ESD Anti Static Sheet Acetal Bar Stock Acetal Hex Rods Acetal Square Rods Acetal-Acetron® Sheet Acetal-Delrin® 570 Rod (20% Glass) Acetal-Delrin® 570 Sheet (20% Glass) Acetal-Celcon® M25 Sheet FDA-NSF Acetal-Delrin® AF Teflon® Filled Discs Acetal-Delrin® AF Teflon® Filled Rods Acetal-Delrin® AF Teflon® Filled Sheet Acetal-Delrin® Balls Acetal-Delrin® Bar Stock Acetal-Delrin® Discs Acetal-Delrin® Rod Acetal-Delrin® Hex Rod Acetal-Delrin® Sheet Acetal-Delrin® Tubes Acrylic Balls Acrylic Bar Stock Acrylic Blocks Acrylic Cabochons Acrylic Discs Acrylic Half Rods Acrylic Mirror Acrylic Rods-Cast Acrylic Rods-Colored Acrylic Rods-Extruded Acrylic Rods-Florescent Acrylic Sheet- Bullet Proof Acrylic Sheet- Cast Acrylic Sheet- Cast, Anti Static Acrylic Sheet- Cast, Flourescent Acrylic Sheet- Cast, Lucite® Acrylic Sheet- Cast, MIL-P-5425 Acrylic Sheet- Color Plaques Acrylic Sheet-Cyro-Acrylite® Acrylic Sheet-Cyro-Acrylite®-Abrasion Resistant Acrylic Sheet-Cyro-Acrylite®-DP32 (Textured) Acrylic Sheet-Cyro-Acrylite®-FF (Cell Cast) Acrylic Sheet-Cyro-Acrylite®-FF P99 (Textured) Acrylic Sheet-Cyro-Acrylite®-GP Acrylic Sheet-Cyro-Acrylite®-OP1, UV Transmitting Acrylic Sheet-Cyro-Acrylite®-OP2, UV Resistant Acrylic Sheet-Cyro-Acrylite®-P95 (Textured) Acrylic Sheet-Flourescent Acrylic Sheet-General Purpose Acrylic Sheet-Optix® Acrylic Sheet-Plexiglas® Acrylic Square Rods Acrylic Tubes - 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