SIC Code 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. 

Subcategories are listed in order from general (3-Digit) to more specific (4-Digit) industry

3-DIGITS4-DIGITS
331 - Steel Works, Blast Furnaces, and Rolling and Finishing Mills3312 - Steel Works, Blast Furnaces (including Coke Ovens), and Rolling Mills
3313 - Electrometallurgical Products, except Steel
3315 - Steel Wiredrawing and Steel Nails and Spikes
3316 - Cold-rolled Steel Sheet, Strip, and Bars
3317 - Steel Pipe and Tubes
332 - Iron and Steel Foundries3321 - Gray and Ductile Iron Foundries
3322 - Malleable Iron Foundries
3324 - Steel Investment Foundries
3325 - Steel Foundries, Not Elsewhere Classified
333 - Primary Smelting and Refining of Nonferrous3331 - Primary Smelting and Refining of Copper
3334 - Primary Production of Aluminum
3339 - Primary Smelting and Refining of Nonferrous Metals, except Copper and Aluminum
334 - Secondary Smelting and Refining of Nonferrous3341 - Secondary Smelting and Refining of Nonferrous Metals
335 - Rolling, Drawing, and Extruding of Nonferrous3351 - Rolling, Drawing, and Extruding of Copper
3353 - Aluminum Sheet, Plate and Foil
3354 - Aluminum Extruded Products
3355 - Aluminum Rolling and Drawing, Not Elsewhere Classified
3356 - Rolling, Drawing, and Extruding of Nonferrous Metals, except Copper and Aluminum
3357 - Drawing and Insulating of Nonferrous Wire
336 - Nonferrous Foundries (Castings)3363 - Aluminum Die-Castings
3364 - Nonferrous Die-Castings, except Aluminum
3365 - Aluminum Foundries
3366 - Copper Foundries
3366 - Copper Foundries
3369 - Nonferrous Foundries, except Aluminum and Copper
339 - Miscellaneous Primary Metal Products3398 - Metal Heat Treating
3399 - Primary Metal Products, Not Elsewhere Classified

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