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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