Shows the class number of parts, reinforcement, and surfaces.

For assemblies and cast units, MAINPART.CLASS_ATTR shows the class number of the main part.

For bolts, welds, and connections, CLASS_ATTR can be used for showing the class number of bolted, welded, or connected parts. For example, to show the class number of the bolt main part or the first secondary part, use MAIN_PART.CLASS_ATTR or SECONDARY_1.CLASS_ATTR.