| [331111] Iron and Steel Mills |
| [331112] Electrometallurgical Ferroalloy Product Manufacturing |
| [331221] Rolled Steel Shape Manufacturing |
| [331222] Steel Wire Drawing |
| [331491] Nonferrous Metal (except Copper and Aluminum) Rolling, Drawing, and Extruding |
| [331492] Secondary Smelting, Refining, and Alloying of Nonferrous Metal (except Copper and Aluminum) |
| [331511] Iron Foundries |
| [332111] Iron and Steel Forging |
| [332112] Nonferrous Forging |
| [332114] Custom Roll Forming |
| [332116] Metal Stamping |
| [332117] Powder Metallurgy Part Manufacturing |
| [332612] Spring (Light Gauge) Manufacturing |
| [332811] Metal Heat Treating |
| [336412] Aircraft Engine and Engine Parts Manufacturing |
| [336413] Other Aircraft Parts and Auxiliary Equipment Manufacturing |
