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| Common Number or Symbol | Method of Finish | Minimum Grit Finish | Range of "Ra" Values (µin) | Explanation of Material Finish or Finishing |
| #1 | Unpolished | None | 125-375 | Standard mill plate finish; hot rolled, annealed and pickled or descaled; for all plate thickness from 3/16" thru 10" (dull gray finish). |
| #2D | Unpolished | None | 80-100 | Standard mill finish; thicknesses of #7 thru #28 gauge plate continuous mill cold rolled, annealed and pickled or descaled to final thickness (dull finish). |
| #2B | Unpolished | None | 20-80 | Standard mill gauge finish; thicknesses such as #7 thru #28; cold rolled, annealed and pickled or descaled plus final cold reduction on tempered mills (bright finish). |
| #2BE | Electropolished | None | 5-25 | Bright cold rolled 2B finish with a final electropolish after fabrication. |
| #2BA | Unpolished | None | 1-10 | Bright cold rolled finish, final annealing in controlled atmospheric furnace; applicable to #14 thru #24 gauge. |
| #2BAE | Electropolished | None | Less than 5 | Bright cold rolled 2BA finish with a final electropolish after fabrication. |
| #3M | Polished | #100 | 60-80 | Mill finish mechanically ground with abrasives using #1, #2D or #2B base materials; common exterior finish for many applications. |
| #4M | Polished | #120/#150 | 30-70 | General purpose mechanically ground with abrasives using a #2B or #3M base finish material; commonly used for food interior finishes and some pharmaceutical exterior/ interior finish. |
| #4E | Electropolished | #120/#150 | Less than 50 | Final electropolish finish over a #4M base finished material; used in some food, beverage and pharmaceutical applications. |
| #5M | Polished | #180 | 20-50 | Mechanically further abrasive buffing with oil over a #4M base material; commonly used as a pharmaceutical interior base finish. |
| #5E | Electropolished | #180 | Less than 30 | Final electropolish finish over a #5M base finished material; used in pharmaceutical and other interior applications. |
| #6M | Polished | #240 | 15-30 | Mechanically further fine abrasive buffing with oil over a #4M or #5M base material; used in pharmaceutical and food processing. |
| #6E | Electropolished | #240 | Less than 20 | Final electropolish finish over a #6M base finished material; most common pharmaceutical interior finish, particularly intravenous application. |
| #7M | Polished | #320 | 10-20 | Mechanically very fine abrasive buffing with oil or rouges over a #6M base finished material; common for some pharmaceutical interior applications. |
| #7E | Electropolished | #320 | Less than 10 | Final electropolish finish over a #7M base finished material; pharmaceutical, architectural or ornamental purposes. |
| #8M | Polished | #400 | 5-10 | Mechanically the finest abrasive buffing with rouges over a #7M base finished material; mirror like, small parts applications. |
| #8E | Electropolished | #400 | Less than 5 | Final electropolish finish over a #8M base finished material for highest reflectivity, small parts applications. |
| #9TR | Unpolished | None | 100-250 | Standard hot rolled, annealed and pickled or descaled plate material with an additional cold reduction over temper mill rolls; applicable for 72" and under widths, 3/16" thru 1/2" thicknesses. |
| #10TR | Unpolished | None | 20-100 | Standard hot rolled, annealed and pickled or descaled plate material with an additional double cold reduction over temper mill rolls; applicable for 72" and under widths, 3/16" thru 1/2" thicknesses. |
| #11LB | Unpolished | None | 25-75 | Cold rolling using grain patterned rolls over a #2B base material; for #10 thru #22 gauge thicknesses; applicable to many architectural or ornamental purposes. |
| Please note that #1 plate and #2B for gauge base materials are the most common, both are classified as mill finishes. | ||||
| Electropolishing refers to a process whereby the surface is removed through the process of "Anodic dissolution in a suitable electrolyte under an imposed current potential". | ||||
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Ouverture le: 25-Jan.2005 Dernière mise à jour 25-Jan-2005 Création et gestion du site par: Gérald Joyce | |
