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-DIGITS	4-DIGITS
331 - Steel Works, Blast Furnaces, and Rolling and Finishing Mills	3312 - 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 Foundries	3321 - 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 Nonferrous	3331 - 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 Nonferrous	3341 - Secondary Smelting and Refining of Nonferrous Metals
335 - Rolling, Drawing, and Extruding of Nonferrous	3351 - 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 Products	3398 - Metal Heat Treating
	3399 - Primary Metal Products, Not Elsewhere Classified

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