| 2007 NAICS | 2012 NAICS | 2017 NAICS | Corresponding Index Entries | |||
| 332111 | 332111 | 332111 | Cold forgings made from purchased iron or steel, unfinished | |||
| 332111 | 332111 | 332111 | Drop forgings made from purchased iron or steel, unfinished | |||
| 332111 | 332111 | 332111 | Ferrous forgings made from purchased iron or steel, unfinished | |||
| 332111 | 332111 | 332111 | Forgings made from purchased iron or steel, unfinished | |||
| 332111 | 332111 | 332111 | Gun forgings made from purchased iron or steel, unfinished | |||
| 332111 | 332111 | 332111 | Hammer forgings made from purchased iron or steel, unfinished | |||
| 332111 | 332111 | 332111 | Horseshoes, ferrous forged, made from purchased iron or steel | |||
| 332111 | 332111 | 332111 | Hot forgings made from purchased iron or steel, unfinished | |||
| 332111 | 332111 | 332111 | Iron forgings made from purchased iron, unfinished | |||
| 332111 | 332111 | 332111 | Press forgings made from purchased iron or steel, unfinished | |||
| 332111 | 332111 | 332111 | Steel forgings made from purchased steel, unfinished | |||
| 332111 | 332111 | 332111 | Upset forgings made from purchased iron or steel, unfinished |