Standard Industrial Code Divisions

Major Group: 33—Primary Metal Industries

This major group includes establishments engaged in smelting and refining ferrous and nonferrous metals from ore, pig, or scrap; in rolling, drawing, and alloying metals; in manufacturing castings and other basic metal products; and in manufacturing nails, spikes, and insulated wire and cable. This major group includes the production of coke. Establishments primarily engaged in manufacturing metal forgings or stampings are classified in Industry Group 346.

Codes Titles Total Marketable US Businesses
Industry Group 331: Steel Works, Blast Furnaces, And Rolling And Finishing Mills
3312Steel Works, Blast Furnaces (Including Coke Ovens), and Rolling Mills2,548
3313Electrometallurgical Products, Except Steel68
3315Steel Wiredrawing and Steel Nails and Spikes774
3316Cold-Rolled Steel Sheet, Strip, and Bars164
3317Steel Pipe and Tubes639
Industry Group 332: Iron And Steel Foundries
3321Gray and Ductile Iron Foundries459
3322Malleable Iron Foundries34
3324Steel Investment Foundries245
3325Steel Foundries, Not Elsewhere Classified317
Industry Group 333: Primary Smelting And Refining Of Nonferrous Metals
3331Primary Smelting and Refining of Copper36
3334Primary Production of Aluminum183
3339Primary Smelting and Refining of Nonferrous Metals, Except Copper and Aluminum468
Industry Group 334: Secondary Smelting And Refining Of Nonferrous Metals
3341Secondary Smelting and Refining of Nonferrous Metals322
Industry Group 335: Rolling, Drawing, And Extruding Of Nonferrous Metals
3351Rolling, Drawing, and Extruding Of Copper181
3353Aluminum Sheet, Plate, and Foil323
3354Aluminum Extruded Products409
3355Aluminum Rolling and Drawing, Not Elsewhere Classified237
3356Rolling, Drawing, and Extruding of Nonferrous Metals, Except Copper and Aluminum674
3357Drawing and Insulating of Nonferrous Wire626
Industry Group 336: Nonferrous Foundries (castings)
3363Aluminum Die-Castings269
3364Nonferrous Die-Castings, Except Aluminum167
3365Aluminum Foundries466
3366Copper Foundries430
3369Nonferrous Foundries, Except Aluminum and Copper332
Industry Group 339: Miscellaneous Primary Metal Products
3398Metal Heat Treating762
3399Primary Metal Products, Not Elsewhere Classified644